Re: [Flexradio] TX Overshoot and the dropping of amplifiers...

[Jeff Anderson]

Thanks for the comment, Al.  You're close -- that third picture is actually the 
SSB signal of a sawtooth wave.

73,

- Jeff, k6jca




From: Al K0VM 
To: "flexradio@flex-radio.biz" 
Sent: Fri, March 4, 2011 12:20:41 PM
Subject: Re: [Flexradio] TX Overshoot and the dropping of amplifiers...


Jeff, et al
   Looking at your third snap shot, I see what looks like an attempt to
create an SSB signal from a clipped sinewave ( or squarewave ) as
described by E.W. Papenfus in Single Side Band Priciples and Circuits..

   What is needed is envelope limiting and not audio clipping ..

AL, K0VM




Date: Thu, 03 Mar 2011 10:20:32 -0800
From: Jeff Anderson 
To: flexradio@flex-radio.biz
Subject: [Flexradio] TX Overshoot and the dropping of amplifiers...
Message-ID: <4d6fdbf0.9040...@sbcglobal.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

At the request of a friend, I looked into this topic a bit last summer.
Rather than write a very long post here regarding my testing, I have
just posted my observations to my blog:

  http://k6jca.blogspot.com/

...where, I hope, you'll find that the inclusion of photos makes the
topic more understandable.

73,

- Jeff, k6jca




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Re: [Flexradio] FLEX5K Drops Amplifier

[Jeff Anderson]

Hi Gerald,

From my own experiments, I'm not convinced that it's a problem with the 
ALC algorithm itself (i.e. that it isn't "ALC overshoot"), but rather 
with the placement of the ALC algorithm within the code.


With "stock" code, my measurements show that severe TX overshooting can 
occur, and it seems to depend upon the type of waveform used for 
testing.  Of course, it's always possible that I made a mistake in my 
measurements, so if anyone would like to replicate my tests, please do!  
The testing procedure is simple and straightforward, and I describe it 
in my blog posting at http://k6jca.blogspot.com/ .   All one needs is a 
scope and some way to monitor one's RF signal with it.  (One item I 
forgot to mention in my blog post was TX bandwidth.  I no longer recall 
what it was for my testing, but 3.8KHz is probably in the ballpark .  If 
anyone is going to try to repeat my tests, it might be worthwhile to 
experiment with TX bandwidth (both low-cutoff as well as high-cutoff) to 
see if/how bandwidth  affects TX overshoot).


Best regards,

- Jeff, k6jca


Gerald Youngblood wrote:

Steve et. al.

Well, I am going learn not to propose a public hypothesis based on reading
an email.  ;>)  After testing in the lab, there is no glitch whatsoever when
switching Tune on and off.  I set the spectrum analyzer to 0 Hz span, which
makes it able to catch the power of real time glitches.  There were none at
all.  It was perfect.

Please disregard my earlier speculation as to the faster TR times causing a
problem with spikes on the transmitter.  I was simply wrong.

However, we will definitely look further into the ALC overshoot reports.  I
did some initial measurements but they are inconclusive so far.

Regards,
Gerald


Gerald Youngblood, K5SDR
President and CEO
FlexRadio Systems(TM)
13091 Pond Springs Road, #250
Austin, TX 78729
Phone: 512-535-4713 Ext. 202
Email: ger...@flexradio.com
Web: www.flexradio.com 

Tune In Excitement (TM)

PowerSDR(TM) is a trademark of FlexRadio Systems

  



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[Flexradio] TX Overshoot and the dropping of amplifiers...

[Jeff Anderson]

At the request of a friend, I looked into this topic a bit last summer.  
Rather than write a very long post here regarding my testing, I have 
just posted my observations to my blog:


  http://k6jca.blogspot.com/

...where, I hope, you'll find that the inclusion of photos makes the 
topic more understandable.


73,

- Jeff, k6jca

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[Flexradio] F5K Firmware Update Question...

[Jeff Anderson]

I'd like to update my firmware so that I can use the new pb-pal console.

If I go to the flex Download page, I see two different firmware 
programs, dated only 8 days apart.  These are:


  F5K Firmware 1.3.0.8.exe
  FLEX Firmware 20081105.exe

Which one of these two should I use?  It's not clear from the 
description on the Download page.


Thanks!

- Jeff, k6jca

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[Flexradio] SVN no longer updating?

[Jeff Anderson]

It's been a few months since I last updated PowerSDR via SVN.  I just 
tried it, and SVN is now giving me the following error:


   Error:  Not authorized to open root of edit operation.

Of course, I have no idea what this cryptic message means.  It's always 
worked in the past, but I've tried updating PowerSDR on two different 
computers, and both give me the same message.  Has the repository of 
code moved?  Or...what?


By the way, the last version that I'd downloaded was 1.18.4, no. 3380.

Thanks for any help!

- Jeff, k6jca

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Re: [Flexradio] SDR-1000 vs Flex-3000 is it worth the upgrade?

[Jeff Anderson]

What is the source of the claim that the 3K has "MUCH better IMD on 
transmit" than the 1K? 

I see on the Flex website that the 3000's IMD specs are still "TBD."  If 
the 3000 has the same PA as the 5000, then my my measurements of both 
radios show that my 1000 actually has better IMD on transmit than the 
5000, and my 1K's IMD performance improves, compared to the 5K, at lower 
powers (where much of our voice energy lies).


This difference in IMD performance results in the 1K sounding better in 
ESSB than the 5K.


If Flex has redesigned their PA for the 3K to improve its IMD 
performance with respect to the 5K, then I'm very interested to learn 
what they've done -- perhaps I can modify my 5K's PA accordingly.


- Jeff, K6JCA


Tim Ellison wrote:

The differences are numerous and significant.

1.) Uses and internal A/D and D/A converter so no external sound card is 
required.  The elimination of the sound card has several advantages
A.) no rats nest of audio cables and the pesky 1/8" TRS jacks to deal with.
B.) limited variation in the buffer interaction between different sound cards 
and PowerSDR
C.) much better filters at the 0 Hz (DC IF) for a much less pronounced "DC hump"
D.) no filter aliasing drop off at the end of the sampling spectrum found on 
some sound cards
E.) greater portability and stability - no external sound card to move around 
and cause problems
F.) Less susceptible to RFI ingress (few cables going into the SDR hardware)
G.) Not dependent on third-party manufacturer for audio drivers for newer 
versions of Windows
H.) No "clunky" microphone setup by doing pass-thru cabling to a sound card

2.) Elimination of the parallel control interface - replaced with Firewire.
A.) Parallel cable is bulky
B.) Parallel port becoming rare on newer PCs
C.) Less susceptible to RFI ingress (few cables going into the SDR hardware)
D.) Obsolete "bit bang"  technology for controlling SDR hardware no longer used

3.) Better operational performance and stability because of BITE (built in test 
equipment) - the radio can calibrate itself and that information is stored 
local to the SDR in the EEPROM.  No more re-calibration when a new database is 
used or created

4.) Significant Hardware improvements
A.) Essentially no DDS spurs in the ham bands - 12,10 and 6m are usable.
B.) No extraneous noise from DC-DC converter
C.) Greater frequency stability (TCXO)
D.) MUCH better preamp - especially on the upper frequencies and 6m
E.) MUCH better IMD on transmit
F.) 100 watts on 6m
G.) Better constructed PCBs and higher quality components
H.) Better filtering

4.) Quieter receiver than the SDR-1000

5.) Better positioned to take advantage of new software features and 
enhancements - because of the ability to store hardware specific information in 
the EEPROM, the FLEX family of SDRs can take full advantage of advanced 
features, such as the new RX wide band image rejection.

6.) Fits in a laptop bag.

7.) It is blue :-)


-Tim

-Original Message-
From: flexradio-boun...@flex-radio.biz 
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of gelatin...@juno.com
Sent: Saturday, May 30, 2009 3:41 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] SDR-1000 vs Flex-3000 is it worth the upgrade?

I haven't seen any direct discussion in the archives of the advantages of upgrading from an SDR-1000 to the new Flex-3000.  

Now the obvious ones are built-in tuner, 100 watts on six meters, a smaller footprint, and far less cabling.  But I have my SDR-1000 working well and I've been wondering what improvements I might see if I were to upgrade.  

The biggest complaint I have about the 1000 is the amount of spurious signals displayed in the higher bands.  While the "SR" button certainly moves them out of the way, it would be nice to hear that the 3000 has improved upon this.  


Is the microphone interface improved?  Can you plug a standard handheld mic in 
with default settings on PwrSDR and have reasonable transmit audio?  We all 
know of the growing pains that Flex and 1000 owners have gone through the past 
few years with this particular issue.

Would there be any changes that I might see on PwrSDR using the 3000 instead of the 1000?  


Thanks!

George
N7BUI





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Re: [Flexradio] Error with Pretty Betty

[Jeff Anderson]

Tim, the bug _was_ on the Bug Tracker (number 2041, posted on 29 Jan 
09).  So no process has been circumvented.


But from the date I reported it through to today, that bug has remained 
open.  Thankfully though, _because it was posted to the reflector this 
time,_ Lee came back with a proposed solution, and it worked!


- Jeff

P.S. And as of a few minutes ago, Eric has closed out my original bug on 
the Bug Tracker.  It's fixed.



Tim Ellison wrote:


Whether or not the perception is that the Reflector was more effective 
is not the issue.  The development team has requested on numerous 
occasions (and very recently by Bob again) to place all bug reports in 
the Bug Tracker.  Please, let's follow their wishes and not circumvent 
the process they have requested we utilize to track development requests.


 

 


-Tim

 


*From:* Jeff Anderson [mailto:jca1...@sbcglobal.net]
*Sent:* Wednesday, May 13, 2009 10:57 AM
*To:* Tim Ellison
*Cc:* Flexradio
*Subject:* Re: [Flexradio] Error with Pretty Betty

 

Thanks, Tim & Les --  upgrading to .NET 3.5 plus SP1 worked, and the 
new skins look great.  Frankly, though, the reflector proved much more 
effective at fixing this problem than reporting it to the bug 
database:  check out bug 2041 -- it's one I opened back in January 
when I had _exactly_ the same problem with a previous "test branch" 
SVN.  And it's still open...


- Jeff, k6jca

Tim Ellison wrote:

Here is the link to .NET 3.5
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=25fd-ae52-4e35-b531-508d977d32a6
 
<http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=25fd-ae52-4e35-b531-508d977d32a6>
 
And the link to the service pack

 
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7
 
<http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7>
 
 
 
-Tim
  

 


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Re: [Flexradio] Error with Pretty Betty

[Jeff Anderson]

Ooops -- Lee, that should be your name below, not "Les."

Jeff Anderson wrote:
Thanks, Tim & Les --  upgrading to .NET 3.5 plus SP1 worked, and the 
new skins look great.  Frankly, though, the reflector proved much more 
effective at fixing this problem than reporting it to the bug 
database:  check out bug 2041 -- it's one I opened back in January 
when I had _exactly_ the same problem with a previous "test branch" 
SVN.  And it's still open...


- Jeff, k6jca

Tim Ellison wrote:

Here is the link to .NET 3.5
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=25fd-ae52-4e35-b531-508d977d32a6 



And the link to the service pack
 http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7 





-Tim
 

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http://www.flex-radio.com/





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Re: [Flexradio] Error with Pretty Betty

[Jeff Anderson]

Thanks, Tim & Les --  upgrading to .NET 3.5 plus SP1 worked, and the new 
skins look great.  Frankly, though, the reflector proved much more 
effective at fixing this problem than reporting it to the bug database:  
check out bug 2041 -- it's one I opened back in January when I had 
_exactly_ the same problem with a previous "test branch" SVN.  And it's 
still open...


- Jeff, k6jca

Tim Ellison wrote:

Here is the link to .NET 3.5
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=25fd-ae52-4e35-b531-508d977d32a6

And the link to the service pack
 
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7



-Tim
  


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Re: [Flexradio] Error with Pretty Betty

[Jeff Anderson]

Hmm...I also get an error with DttSP.dll at startup.

- Jeff, k6jca


Joe Roth wrote:

I get the same installation error Roland.
Win Vista SP1.
Error window at http://tinyurl.com/pc2dj9 
Joe 


www.wc4r.com

www.WilliamsburgWX.com




  

From: roland.etie...@free.fr
To: flexradio@flex-radio.biz
Date: Wed, 13 May 2009 13:33:49 +0200
Subject: [Flexradio] Error with Pretty Betty

Hi all,

 


Trying to run svn Pretty Betty version, I have a fatal error at the end of
initialisation, on two different PC:

 


The OS is XP sp3, and PSDR 18.0 runs fine

 


The error is:

 


Input string was not in a correct format.

 


At System.Number.StringToNumber(..)

At System.Number.ParseSingle(..)

Etc..

 


Any idea?

 


Thanks for the fun!

 


73, Roland f8chk.

 



_
Hotmail® goes with you. 
http://windowslive.com/Tutorial/Hotmail/Mobile?ocid=TXT_TAGLM_WL_HM_Tutorial_Mobile1_052009

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Re: [Flexradio] audio

[Jeff Anderson]

Dave -- I don't know if this pertains to what you're experiencing, but I 
found that my 5K has slightly worse TX performance than my SDR-1K, and 
this increase in distortion is noticeable to others when I operate 
"wideband" SSB (which is pretty much the only mode I operate).  I spent 
a lot of time tracking down the cause of this distortion in my 5K (it's 
related to IMD), and eventually found the culprit to be the 5K's final 
PA stage (which are FETs, whereas the 1K uses BJTs).


If you're interested in reading more about it, I describe my tests in my 
blog at: http://k6jca.blogspot.com/ -- go to the blog entries for 2008.


- Jeff, k6jca


David Gardner wrote:

In response to N4ZVN, I and others have received similar reports.  I have tried 
different mics, buffer settings, eq settings, tx bandwidth settings, ferrites 
on all cables with special attention to firewire cable, different firewire 
cards, different final bias settings all with no change to the same reports 
that Ed and Others have heard.  I have run the radio using both XP and Vista 
with the same results.  My computer is a Core2 Quad Dell, 3 gig ram, 2.4 cpu 
and has low cpu usage.  I have tried both 1.18.0 and the latest SVN consoles 
all with the same result.  I, at this point have just had to accept that this 
is the way the radio will have to sound at the present time.
Dave-W4DWG
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Re: [Flexradio] 5000 shutting down on X-mitt

[Jeff Anderson]

If you can pop the covers, verify that the heat-sink tabs of the 
transistors (PA, Driver, and voltage regulators) are properly screwed to 
the chassis (there might be a screw, or screws, loose or missing).


- Jeff

Dudley Hurry wrote:

Jim,

Make sure the powersupply is not dropping out on you or maybe a poor 
power connection from the supply.I once had a fuse develop a 
dislike for high current,  but would not blow. 
73,

Dudley
WA5QPZ

Jim Menefee wrote:
My 5000 has started shutting down during transmission.  When I say 
"shutting

down" I mean it turns off the 5000.  I may have to weight up to
5 minuets before it will power up again... My gut says its a thermal 
issue -

just from past experience with other trons...  Any suggestions.
  


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Re: [Flexradio] CW Skimmer.....Again!

[Jeff Anderson]

I'm wondering...why should the CW Skimmer/PowerSDR interaction care if 
PowerSDR's SR is On or Off?  It shouldn't.


I'd hope that any external program should be working with frequencies 
from PowerSDR that have already compensated for the state of SR 
(compensated internally within PowerSDR).  But, from the reports, it 
would seem that this is not the case, and this points to a possible bug 
within PowerSDR, rather than within CW Skimmer.


Again, just wondering as to the root cause of this problem...

- Jeff, K6JCA


Tim Ellison wrote:

Hi Joel.

I hope you are doing well.

Let me explain the SR issue a little bit.  If I get something wrong, Eric will 
jump in and correct me.

When you change frequency, with SR OFF, the radio hardware (DDS) is changed 
every time you change frequency.  With SR ON, the radio hardware is only tuned 
every ~3.051kHz.  PowerSDR does the fine tuning using software oscillator.

The reason it is recommended to keep SR ON, is that it minimizes the number of 
radio control messages sent from PowerSDR to the radio hardware when you are 
tuning and for that 3 KHz window, the radio will change frequency much faster 
since it is the software oscillator that is changing the frequency and it will 
reduce the number of spurs seen.  The spur issue isn't very applicable with the 
FLEX-5000, but it is with the SDR-1000.

There can also be audio artifacts induced when SR of off when tuning across the 
band.  When SR is off, the hardware has to tune a lot more often and it can 
happen in the middle of a audio sample causing blips or holes in the audio.  
When the software tuning is used, it only tunes in between audio callbacks, 
thus ensuring that samples are not dropped/skewed during the change.

Apparently, having SR on adversely effects CW Skimmer by that ~3 KHz offset, so 
that is why it is recommended to turn it off.

Also there is a notation in the KC article about using CW Skimmer with direct 
I/Q to turn SR off.   It is in the PowerSDR / Main console setup section.  I'll 
make it a bit more prevalent in the article.  
http://kc.flex-radio.com/KnowledgebaseArticle50357.aspx


-Tim


-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joel Harrison
Sent: Friday, December 05, 2008 9:31 AM
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW Skimmer.Again!

 


OK...CW Skimmer problem solved here at W5ZN.

Ed, N5DG, just dropped me a note and said to make sure spur reduction is not
checked.

It was.

As soon as I "unchecked" it everything is working FB.

I don't recall seeing this in the write up on the Flex site, so whoever has
access and control to that may want to put a note in there about SR.

No I have the question of what is it with SR that causes this problem. I
have been told to run SR on CW. It is confusing to me so I need to do some
study, but obviously you can't run SR on CW if you are going to run CWS.

Anyway, as usual many, many thanks to everyone for their help and mucho
thanks to Ed once again (he got me going initially with Skimmer) for his
help.

73 Joel W5ZN


-Original Message-
From: Neal Campbell [mailto:[EMAIL PROTECTED] 
Sent: Friday, December 05, 2008 7:31 AM

To: Joel Harrison
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] CW Skimmer.Again!

Hi Joel

Are you using CW-L? If so I think you have to set the IF freq in Skimmer at
6400 for it to work correctly. I was having similar problems until Ed set me
straight!

73
Neal k3nc
 Neal Campbell
Abroham Neal Software
Programming Services for Windows, OS X and Linux
(540) 242 0911
-
Try Spot for OS X, the intelligent DXCluster Client at
www.abrohamnealsoftware.com -  $15.99
-
For a great dog book, visit www.abrohamneal.com
-
See the FlexRadio Systems Flex-5000a in
action at www.flex-videos.com




On Fri, Dec 5, 2008 at 7:46 AM, Joel Harrison <[EMAIL PROTECTED]> wrote:
  
A few days ago Gary, W7FG, posted a problem to the group that he was 
having with CW Skimmer. I originally have had CW Skimmer working great 
here with PowerSDR, however as of late I am having issues with it to 
the point I am about to throw in the Skimmer towell.


The specific problem is this:

The frequency readout on PowerSDR and CWSkimmer are the same. If I 
change frequency they both track and agree and are correct. I can see 
stations on the CWSkimmer display, they are decoded and all is 
fine...except that the frequency where the station is shown on the 
vertical frequency scale on the right side in the Skimmer display is 
off by more than 3 KHz...sometimes a lot more, and if I click on a 
station in the CWSkimmer disply, PowerSDR will change to that 
frequency and the digital frequency display window in Skimmer will 
change to that frequency also (same freq as displayed in PSDR), but 
that ain't where the station actua

Re: [Flexradio] FlexRadio Digest, Vol 40, Issue 4

[Jeff Anderson]

David,

Regarding your DSP NR crackling - try reducing your AF gain.  If the 
crackling decreases, then what you're probably experiencing is due to 
the DSP math causing the audio to exceed its maximum allowable limits - 
at least, this is my explanation for the phenomena (which I've 
experienced here).  The DSP algorithms are applied after the receive 
AGC.  The AGC itself tries to adjust the signal to utilize the full 
dynamic range of the output ADC - in other words, so that the signal 
peaks are near the limits of the ADC.  But the DSP math, applied after 
this AGC, seems to sometimes result in the signal exceeding the limits.  
An intuitive example of this sort of phenomena is what happens when you 
pass a square wave through a low-pass filter - you'll see "ringing" on 
the square wave's edges that exceeds the amplitude of the original 
square wave.  Now, let's imagine that the amplitude of the original 
square wave had been adjusted so that it's near the peak value of the 
output ADC.  If this signal is then passed through a low-pass "dsp" 
filter, the amplitude of the ringing could exceed the ADC limits, and 
you'll hear crackling.  I don't run my AF gain above 50 for just this 
reason.

Regarding SWR - try selecting this while transmitting.  Also - it might 
not be available except when in TUN mode.

- Jeff, k6jca

[EMAIL PROTECTED] wrote:
> Hi:
>
> I'm having a problem that I'll try to describe in the hope that someone has
> an idea on how to fix it.
>
> I have an SDR 1000 with the FA-66. Using version 1.10.3 of Power SDR, all
> works wonderfully well; however, when trying 1.12.1, two weird problems
> occur.
>
> One is that the tx meter selection does not allow me to select swr.
>
> The second is that the DSP NR crackles( the best way I can describe it). I
> was told that my computer may be borderline ( it's an amd turion 64 at 1.8
> ghz with 2gb of ram ), so I tried a core 2 duo at 2.1 ghz with 2 gb ram with
> no difference.
>
> Thanks for any ideas. 73
>
> David A. Eisenberg WA3HVR
>   
>   

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[Flexradio] TX Mic Level

[Jeff Anderson]

For those who use external mic amplification equipment with your 5000, 
what level do you set the Console's Mic Gain to?

You can reply directly to me, rather than the reflector.

Thanks,

- Jeff, k6jca

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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

Some time ago I looked at power supply variation (using a scope), and I 
didn't see anything abnormal when comparing my 1K to my 5K (there was 
some small variation under load) , both of which run off of the same 
supply (Astron RM-35).  Of course, this doesn't let the supply out of 
the woods, but it moved it lower down my list of possible suspects.

Tim's method is also a good way to check supply sag when under load, but 
it's also important to define what the test condition is.  Tim, was this 
using the TUN signal?  And if so, at what power?

Thanks,

- Jeff


Tim Ellison wrote:
> One other thing to do is use the ++I to bring up the Information 
> dialog box and see what voltage is being shown during transmit.  This is not 
> as accurate, but I will give you an indication of what might be happening.
>
> I needed to adjust the output voltage on my Astron RS-35M up by about 0.5 
> volts and I still see a sage from 13.8 to 13.4 during transmit.
>
> BTW, I have an early FLEX-5000 and I don't hear the reported distortion 
> listening with a 2nd receiver.
>
>
> -Tim
>
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray, K9DUR
> Sent: Thursday, July 10, 2008 12:25 PM
> To: 'Doug McCormack'; flexradio@flex-radio.biz
> Subject: Re: [Flexradio] TX Audio Quality Help, please!
>
> Doug,
>
> I agree that it probably is power supply related.
>
> In most of the comments, everyone has overlooked the fact that Jeff's radio
> was sent back to Flex and thoroughly checked out, and the problem was not
> found.  However, nobody, including Flex, disputes the fact that there is a
> problem when the rig is operated at Jeff's QTH.  This means that the problem
> is specific to Jeff's installation.  It cannot be bias adjustment, design
> flaw, or anything else within the radio itself.
>
> The power supply & associated wiring is the only factor that is different
> between the 2 locations.
>
> The 1st thing I would do is put an oscilloscope on the DC power input at the
> radio, not at the output of the power supply.  But then, I suspect that he
> has tried that already.
>
> 73, Ray, K9DUR
>
>
>
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[Flexradio] RF Susceptibility testing

[Jeff Anderson]

Gerald,

Does Flex have any way to test for RF susceptibility?  If not, you may 
want to get a few more pieces of test equipment, because having a 
repeatable method in the lab for testing and verifying these sorts of 
problems can be invaluable.  May I make a few suggestions?

- Jeff

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[Flexradio] Thanks for the TX audio help!

[Jeff Anderson]

Just a quick note of thanks to the reflector...

Although I haven't yet resolved my problem, I'd like to thank everyone 
on the reflector for their great responses regarding my TX Audio 
problem!  You've given me many great suggestions, and I'll be following 
up with more experiments over the next days.

And I would like to thank Flex for their help, too.  I know that they've 
also been putting in a lot of work to try to find the root cause of my 
problem, and I very much appreciate their efforts.

Now I need to run some errands, and then...back to the lab!

73,

- Jeff, k6jca

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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

Hi Brian,

I've run THD (on the analog signals) and IMD (on the RF signals).  What 
I hear correlates strongly with IMD levels at lower powers (where much 
of our voice energy is) when compared between 5K driver, 5K final, and a 
1k.  Correlation does not mean causality, but...no one has yet come up 
with a better idea.

Other notes...

I recalibrated the bias and power (default bias seems to be 1.0A for the 
drivers and 2.0A for the finals).   I can't tell if there's a change in 
distortion or not, but IMD did not change appreciably (a dB or so).  
Will listen again tomorrow - my ears are tired.

Also, I tried 10-band EQ settings from Dale.  No joy.

Does anyone who is familiar with the 5K circuitry (and understands PA 
design - this isn't my field) have any ideas for improving the linearity 
of the PA final stage?  (Apart from adjusting bias, that is.)  This 
would be a great experiment to try.

- Jeff

Brian Lloyd wrote:
> On Jul 8, 2008, at 12:18 PM, K6JEK wrote:
>
>   
>> It not just Jeff.   I'm one of the guys who've been listening to the
>> various audio tests.  We first noticed something funny in someone
>> else's 5000 before Jeff even got his. We ran experiment after
>> experiment. This guy finally returned his for a refund.  Then another
>> fellow (not in the local rag chew group) broke in with his 5000 to
>> say he's just waiting for someone to figure this out.  His 5000 had
>> the same problem.  We've been listening and recording with a variety
>> of equipment ranging from 1000's to direct conversion home brews.
>>
>> It is subtle.  It might be rare.  But it is not unique to JCA
>>
>> I think Jeff's nailed it.  The audio up through the driver stage is
>> perfect.  It gets funky in the final.  Why and what to do about it is
>> another matter.
>> 
>
> Has anyone run single-tone and two-tone tests and looked at the  
> distortion products? (THD and IMD). If you can hear it you can  
> probably measure it. The spectrum will tell you something about what  
> might be causing it.
>
> Oh, has anyone looked at the gain of the PA? If the PA uses feedback  
> to linearize it, there may be a problem with the feedback loop and the  
> PA may be running open-loop.
>
> --
>
> 73 de Brian, WB6RQN
> Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
>
>
>
>
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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

I agree, it's peculiar.  But again - if it's a leveler issue (i.e. 
software) I'd expect to hear it at the PA driver, too.  But I don't (but 
perhaps others do?  Ref:  1st half of 6 July test).  By the way, I just 
checked, and the Leveler has been OFF (box not checked) for all of my 
tests.  The only TX effect I have enabled is TX EQ, which is set to the 
same EQ values for all of my tests.

What I wonder is this:  can distortion at RF (rather than at AF) have 
this same "soft compression" effect, after the RF is demodulated? 

- Jeff

Frank Brickle wrote:
> On Mon, Jul 7, 2008 at 7:30 PM, Jeff Anderson <[EMAIL PROTECTED] 
> <mailto:[EMAIL PROTECTED]>> wrote:
>  
>
> Frank, I agree, I'm sure the distortion is not in the ADC/DAC
> components
> (nor software, nor input stages) either, because I don't hear it
> at the
> 5K PA's *driver stage* output, which is well after the output DAC
> (ref:
> 1st half of 6 July recording).  The problem only pops up at the output
> of the *final* stage.
>
>
> What's peculiar about the compression is that it's "soft," not 
> clipped. You have to wonder about the leveler settings.
>
> 73
> Frank
> AB2KT
>
> -- 
> "Sapristi nabolis!" -- Count Jim Moriarty 

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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

To answer some recent questions...

Frank, I agree, I'm sure the distortion is not in the ADC/DAC components 
(nor software, nor input stages) either, because I don't hear it at the 
5K PA's *driver stage* output, which is well after the output DAC (ref: 
1st half of 6 July recording).  The problem only pops up at the output 
of the *final* stage.

And this is why (per Dale's comment) I don't think it's a problem with 
the balanced line input.  If this input was causing the audio to sound 
grundgy, then I'd expect to hear it at the PA Driver stage, too (1st 
half of 6 July recording).  But I don't.  (But maybe I'm missing 
something really obvious, or doing something wrong.  Suggestions?).

Per Jim - this 5K (my second one) is right out of the box, and I didn't 
recal PA bias (I shouldn't have to, right?).  By the way, I had this 
exact same problem with my first 5K, too, and I could not fix the 
problem despite numerous bias recalibrations as well as experiments with 
various bias settings, so I'm skeptical that recalibrating bias will 
have any appreciable effect.  Still, it wouldn't hurt to give it a try.  
I'll try to get to this tomorrow.

Thanks again!

- Jeff


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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

Thanks to everyone for their replies and suggestions.

To answer some of the questions I've received...

1.  I've run IMD tests on both the 1K and the 5K and at various powers 
(3 dB steps).

2.  The problem seems to be independent of code version.

3.  All tests are made into a dummy load.

4.  The PR-40 is connected directly to the Balanced Line In of the 5K.

5.  I don't run the compandor or compressor.  And I keep the mic signal 
below 0 dB.

6.  I don't believe it's a problem with mic gain, or rf feedback into 
the mic, or something else in the input stages.  I believe that my third 
recording (the July 6 recording) bears out this conclusion.  If I listen 
to the signal at the TX Driver output, it sounds fine to me - if there 
was any sort of problem with the mic (gain or rf feedback, etc.) you'd 
hear it here, too, because we're well past the mic input circuits.  But 
I don't hear any noticable distortion at this stage.  It's only after 
the *next* stage in the TX chain, at the PA output, that I hear the 
distortion - that is, the second half of the third recording (this 
audible distortion correlates well with the differences between driver 
stage IMD and final stage IMD).

Why do I have a problem and others (such as Dale) don't?  Is there 
something wrong with the way I'm testing this?  Is there something in my 
voice timbre that's not in other voices and that exacerbates this 
problem?  Is it something else?  I've no idea.  Dale sent a screenshot 
of his eq settings.  I'll give these a try tomorrow...

Keep those suggestions coming!  Thanks again for your help, and 73,

- Jeff, k6jca



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Re: [Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

Hi Frank,

Thanks for the reply!  I can probably post any sort of format, but you 
may have to help me out a bit - I don't know what flac-compression is.

The original Flex WAV files (recorded at 96 ksps) are on the order of 10 
MB each.  To get them down to a reasonable size and to record two files 
side-by-side (because it makes comparisons much easier), I played both 
back (using the Playback feature of the Flex WAVE tab) through the 
Edirol FA66 on one of my SDR-1000's.  I connected the FA66's analog 
output to the analog input of my Delta-44 on the computer I use with my 
other SDR-1000 (via a patch cable), and I recorded them using the free 
version of Audacity.  The record sample rate was set to 44.1 KHz.

I then used Audacity to edit out some of the "silence" time between the 
two recordings, and I converted the file to an MP3 using their 
recommended mp3 plug-in.

Audacity can also export as a WAV file (although I've never tried this), 
and I can change its sample rate to 48K.  Would something like this be 
acceptable?  (And is flac-compression an option for WAV file generation?)

Or I could post the original Flex WAV files - zipping them up will 
reduce their size somewhat, but they'll still be HUGE.  The advantage, 
though, is that there won't be any distortion introduced by this 
process, and anyone can listen to them (as long as they have a Flex 
radio) in their full, 96 ksps glory.

By the way - I should mention that the mp3 files that I posted sound 
surprisingly similar to the original files (to me at least - I can't 
tell any difference), but I'd be happy to try something else.

Thanks again, and 73!

- Jeff, k6jca

P.S.  I'll be away from the computer for awhile.  Will hope to respond 
later this evening...

Frank Brickle wrote:
> Jeff --
>
> Is there any chance you have saved the original recordings as WAVEs, 
> including the source files? If so, can you post them as 48kHz 
> flac-compressed?
>
> The mp3 encoding and then re-expansion to 44.1kHz rather than 48 
> introduce an array of spectral distortions all on their own.
>
> 73 and thanks
> Frank
> AB2KT
>
> On Mon, Jul 7, 2008 at 8:42 AM, Jeff Anderson <[EMAIL PROTECTED] 
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Some friends of mine and I often meet on 80 meters to operate in
> wideband audio mode (4k to 5k audio) on SSB.  (Yes, I know that this
> isn't recommended operating practice,but we do it early in the evening
> before the band becomes occupied, so (hopefully) we aren't bothering
> anyone, and it sure does sound good.)  Anyway, there have been a few
> complaints about my audio.  I've been fighting this problem since
> January, and I've tried a number of things to improve the audio, but
> nothing has helped.  Neither Gerald nor John at Flex have had any luck
> replicating my problem - it seems I'm the only one experiencing it.
>
> Anyway - I'm at wit's end trying to figure out what the heck is going
> on, and so I thought I'd try the massive brain power on the
> reflector to
> see if anyone here might have any ideas.  I'm open to all suggestions!
>
> To get an idea of what I'm experiencing, you can go to my Blog.
>  The URL
> is:  http://k6jca.blogspot.com/
>
> There are three different audio tests.  If you could, please take a
> listen.  Is there distortion, or am I imagining things?  If you do
> hear
> distortion, any ideas of what to do?
>
> Suggestions, advice, and comments are welcome!  And by the way, if any
> of you run a Heil PR-40 directly into your Flex, what settings for
> TX EQ
> do you use?
>
> Thanks!
>
> - Jeff, k6jca
>
>
>
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[Flexradio] TX Audio Quality Help, please!

[Jeff Anderson]

Some friends of mine and I often meet on 80 meters to operate in 
wideband audio mode (4k to 5k audio) on SSB.  (Yes, I know that this 
isn't recommended operating practice,but we do it early in the evening 
before the band becomes occupied, so (hopefully) we aren't bothering 
anyone, and it sure does sound good.)  Anyway, there have been a few 
complaints about my audio.  I've been fighting this problem since 
January, and I've tried a number of things to improve the audio, but 
nothing has helped.  Neither Gerald nor John at Flex have had any luck 
replicating my problem - it seems I'm the only one experiencing it.

Anyway - I'm at wit's end trying to figure out what the heck is going 
on, and so I thought I'd try the massive brain power on the reflector to 
see if anyone here might have any ideas.  I'm open to all suggestions!

To get an idea of what I'm experiencing, you can go to my Blog.  The URL 
is:  http://k6jca.blogspot.com/

There are three different audio tests.  If you could, please take a 
listen.  Is there distortion, or am I imagining things?  If you do hear 
distortion, any ideas of what to do?

Suggestions, advice, and comments are welcome!  And by the way, if any 
of you run a Heil PR-40 directly into your Flex, what settings for TX EQ 
do you use?

Thanks!

- Jeff, k6jca



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Re: [Flexradio] Waterfall Display observation

[Jeff Anderson]

Dale is correct - you can change sensitivity via the menues.  By the 
way, my implementation of the waterfall calls the Flex Waterfall routine 
for the bottom part of the display.  In other words, I took the 
extremely easy route of using existing routines and did not add anything 
at all to the algorithm.

- Jeff, k6jca

Dale Boresz wrote:
> Dave,
>
> Are you aware that you can change the waterfall sensitivity to whatever 
> you'd like via the Setup > Display > [Waterfall] section?
>
> 73, Dale
> WA8SRA
>
>
> Dave Blaschke wrote:
>   
>> I have a comment concerning the Flex-radio PowerSDR waterfall display.
>>
>> For weak signal work (i.e. EME work), the K6JCA "skins" version of 
>> PowerSDR has an excellent waterfall display when run in conjunction 
>> with the panadaptor. This version of the waterfall easily displays 
>> weak signal traces when set up correctly, and approaches the 
>> performance of the K1JT WSJT waterfall display.
>>
>> Not so with the standard Flex-Radio PowerSDR waterfall display. It is 
>> sorely lacking in the weak signal detection area.
>>
>> I strongly recommend that Flex adopt and incorporate the K6JCA 
>> waterfall algorithm in order to improve visual weak signal detection.
>>
>> I have come to this conclusion by extensive side-by-side comparisons 
>> of both during actual operating times on 2 meter CW and WSJT.
>>
>> Dave, W5UN
>>
>>
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>> 
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Re: [Flexradio] The inherent muddiness of typical amateur transceiver

[Jeff Anderson]

Not that it matters, but the 92/93 mentioned below really should be 
02/03.  My, how time flies!

- Jeff

Jeff Anderson wrote:
> Interestingly, one of the primary reasons why the Polycom white paper 
> (see previous postings) was written was that it was to be a sales tool 
> to help explain to customers why they should purchase Polycom's VTX-1000 
> speakerphone (which was introduced sometime in the 92/93 time-frame, but 
> I've forgotten exactly when).  This is a speakerphone which, using 
> encoding, compresses 7 KHz of audio into the existing 3 KHz spectrum of 
> an analog phone line.
>
> - Jeff, k6jca
>
> P.S.  7 KHz audio sounds significantly more natural when compared to 
> standard POTS ("Plain Old Telephone System") bandwidth audio.
>
>
> Scott McClements wrote:
>   
>> I apologize in advance for getting sucked into this hot topic. I think
>> there is merit to both side of the argument, but I think the future
>> must be developing digital modes that will allow digital voice with a
>> natural sounding frequency response. In other words we need to cram
>> 6Khz of audio (or more) within a 3Khz (or less) worth of RF spectrum.
>> This is experimentation - development -  that we need.
>>
>> I've never heard my grandmother say it was  an "experiment" when she
>> turned the treble and bass knobs on her car's stereo.
>>
>> -Scott, WU2X
>>
>>
>>
>> On 6/3/08, Brian C <[EMAIL PROTECTED]> wrote:>
>>   
>> 
>>> That said, everyone knows wider bandwidths should not be employed on very 
>>> crowded amateur bands, nonetheless, the key to intelligibility and fidelity 
>>> is  b a n d w i d t h.
>>> 
>>>   
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Re: [Flexradio] The inherent muddiness of typical amateur transceiver

[Jeff Anderson]

Interestingly, one of the primary reasons why the Polycom white paper 
(see previous postings) was written was that it was to be a sales tool 
to help explain to customers why they should purchase Polycom's VTX-1000 
speakerphone (which was introduced sometime in the 92/93 time-frame, but 
I've forgotten exactly when).  This is a speakerphone which, using 
encoding, compresses 7 KHz of audio into the existing 3 KHz spectrum of 
an analog phone line.

- Jeff, k6jca

P.S.  7 KHz audio sounds significantly more natural when compared to 
standard POTS ("Plain Old Telephone System") bandwidth audio.


Scott McClements wrote:
> I apologize in advance for getting sucked into this hot topic. I think
> there is merit to both side of the argument, but I think the future
> must be developing digital modes that will allow digital voice with a
> natural sounding frequency response. In other words we need to cram
> 6Khz of audio (or more) within a 3Khz (or less) worth of RF spectrum.
> This is experimentation - development -  that we need.
>
> I've never heard my grandmother say it was  an "experiment" when she
> turned the treble and bass knobs on her car's stereo.
>
> -Scott, WU2X
>
>
>
> On 6/3/08, Brian C <[EMAIL PROTECTED]> wrote:>
>   
>> That said, everyone knows wider bandwidths should not be employed on very 
>> crowded amateur bands, nonetheless, the key to intelligibility and fidelity 
>> is  b a n d w i d t h.
>> 
>
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Re: [Flexradio] Flex 5000 pulse output

[Jeff Anderson]

I've seen this, too.  I believe it's a bug in the software. What seems 
to be happening is that the TUN signal (from the previous transmission) 
is still in one (or more?) of the TX buffers, and it squirts out at the 
start of the next transmission.

- Jeff, k6jca

hartfuss wrote:
> Hi, a bug in v1.10.4?:
> activating MOX for the first time after using the TUN function,
> a pulse is emitted with a length of about 10 ms at almost full power.
> 73s, Hans, DL2MDQ.
>
>
>
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Re: [Flexradio] Flex 5000

[Jeff Anderson]

Hmmm...you know what?  Every now and again my 5000 displays "High SWR" 
while transmitting (yet I know it's near 1:1 using an external meter).  
If I toggle back to receive and then retransmit, it's fine.  I wonder if 
this is the same problem as the "deaf receiver" issue, but on the xmit 
side?  Cause?  I bet it's a relay not being properly closed (or opened).

- Jeff, k6jca

Dave Blaschke wrote:
> At 21:16 1/28/2008, you wrote:
>   
>> I've never done that - when I'm operating I've found
>> that simply toggling MOX fixes it.
>>
>> - Jeff
>> 
>
>
> Add me to the list of those experiencing this. I experience this 
> occasionally also. However, let me add: I often find that when the 
> receive comes back and seems dead, that if I listen carefully, and 
> there is a strong station on the other end replying, I will actually 
> hear his signal very weakly. I  momentarily trip the VOX or PTT and 
> the receive is back to normal levels.
>
> Dave, W5UN
>
>
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Re: [Flexradio] Flex 5000

[Jeff Anderson]

I've never done that - when I'm operating I've found
that simply toggling MOX fixes it.

- Jeff

--- Tim Ellison <[EMAIL PROTECTED]> wrote:

> To those having this issue.  If you toggle PowerSDR
> from on to off to on does this clear it up and bring
> the receiver back?
> 
> -Tim
> 
> 
> 
> -Original Message-
> From: Jeff Anderson [mailto:[EMAIL PROTECTED]
> Sent: Monday, January 28, 2008 3:17 PM
> To: Tim Ellison; Jerry Harley; FlexRadio
> Subject: Re: [Flexradio] Flex 5000
> 
> I've seen this, too.  Even with the latest version
> of
> software.  Sometimes after keying the radio (I use
> the
> "MOX" button on the Console), it fails to properly
> return to Receive:  there's no audio, and I need to
> quickly toggle to xmit and back radio (not that easy
> with a mouse!) to get the radio back into its proper
> state.
> 
> - Jeff, k6jca
> 
> --- Tim Ellison <[EMAIL PROTECTED]> wrote:
> 
> > What version of the software are you using?  If it
> > is not v1.10.4, you should upgrade and see if the
> > problem exist with the released version.
> >
> > -Tim
> > 
> >
> >
> > -Original Message-
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On
> Behalf
> > Of Jerry Harley
> > Sent: Monday, January 28, 2008 2:47 PM
> > To: FlexRadio
> > Subject: [Flexradio] Flex 5000
> >
> > I have been having this problem all along.  I use
> > VOX mostly but have
> > seen this on PPT also.  When the Flex 5000 returns
> > to receive I don't
> > always here a signal.  I have to key the Tx and
> then
> > it returns to
> > receive.  This is very repeatable, about one in 10
> > times when using
> > VOX.  I'll have to try with PPT.  Is this my TX/RX
> > relay or a software
> > problem.  Jerry
> >
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Re: [Flexradio] Flex 5000

[Jeff Anderson]

I've seen this, too.  Even with the latest version of
software.  Sometimes after keying the radio (I use the
"MOX" button on the Console), it fails to properly
return to Receive:  there's no audio, and I need to
quickly toggle to xmit and back radio (not that easy
with a mouse!) to get the radio back into its proper
state.

- Jeff, k6jca

--- Tim Ellison <[EMAIL PROTECTED]> wrote:

> What version of the software are you using?  If it
> is not v1.10.4, you should upgrade and see if the
> problem exist with the released version.
> 
> -Tim
> 
> 
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
> Of Jerry Harley
> Sent: Monday, January 28, 2008 2:47 PM
> To: FlexRadio
> Subject: [Flexradio] Flex 5000
> 
> I have been having this problem all along.  I use
> VOX mostly but have
> seen this on PPT also.  When the Flex 5000 returns
> to receive I don't
> always here a signal.  I have to key the Tx and then
> it returns to
> receive.  This is very repeatable, about one in 10
> times when using
> VOX.  I'll have to try with PPT.  Is this my TX/RX
> relay or a software
> problem.  Jerry
> 
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Re: [Flexradio] New K6JCA console program

[Jeff Anderson]

Eric is right.  However, the "quick" record and playback buttons on my 
console automatically use pre/post processing settings appropriate for 
recording a signal "off-the-air" and then playing it back during xmit, 
which is what I and my friends use the record function for 99% of the 
time.  I (and others) also found that using the WAVE-tab user interface 
was more than a bit confusing, because the default selections for 
processing weren't the correct ones needed for this type of operation, 
and trying to figure out which of the four possible choices these two 
settings should be was frustrating when trying to record and playback 
during a QSO.  Which should I use for recording & playback?  Pre or post 
RX processing, and pre or post TX processing?  I've no idea, and when I 
want to record something, I really don't want to dig through a website 
(or manual) to try to figure out what it should be.

To prevent confusion, I probably should have grayed-out the PLAY button 
when *not* in xmit, so that it cannot be pressed during receive.

Perhaps more ideally, the two buttons should serve any possibility of 
user functions, but then I think they'd just become as complex as the 
WAVE u./i is, which is something I'd prefer to avoid.

Or, better yet, redesign the WAVE u/i so that the controls relate more 
to what the user would like to do (e.g. "Record off-the-air", etc.)

So, for those who'd like to do other kinds of recording and playback 
that are not available with my "quick" buttons, the original WAVE 
functions, with all their flexibility, are still there.

- Jeff

Eric Wachsmann wrote:
> Chris,
>
> It sounds like you are using the pre-processed setting on the trunk version
> of the console.  Set that to post-processed, and I think you'll have what
> you're looking for.
>
>
> Eric Wachsmann
> FlexRadio Systems
>
>   
>> -Original Message-
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>> radio.biz] On Behalf Of Chris Gerber
>> Sent: Saturday, January 19, 2008 11:52 AM
>> To: flexradio@flex-radio.biz
>> Subject: [Flexradio] New K6JCA console program
>>
>> Hi Jeff   (k6jca)
>>
>> First thanks for the new console program. It works like a charm. I am so
>> pleased with it!
>> I have setup both, your and the new SVN version in different folders,
>> so I can switch between both in a second.
>> I am doing a lot of signal recording, and am so happy with your quick
>> recording.
>> Now some questions, you or someone else can answer.
>> Jeff, on your console program, when playing back the recorded
>> soundtrack, I always
>> have to make a leftmouse click inside the spectrum part in order to
>> place the soundtrack into the filter area.
>> Then I am not able to play back a recorded AM signal. Its sounds
>> distorted, I have to use mode LSB, USB or DSB
>> to hear it proper. Why?
>> A good thing is, I am able to play it back on my installed mediaplayers
>> or even change it to MP3 file. to a  much
>> smaller size.
>> Now a second question, does any body know a free mediaplayer to play
>> back the wav files created with the
>> SVN PowerSDR console prorgram. So far I am only able to play it back on
>> the console itself. Am also not able
>> to reformat it to a MP3 file. Am I missing something?
>>
>> 73 Chrs HB9BDM
>>
>> 
>>>   
>>
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Re: [Flexradio] K6JCA download

[Jeff Anderson]

Right.  I'm scratching my head regarding Phil's report.  I'm happy to 
hear that it's performing well for him, but I wasn't anywhere near any 
signal processing functions when I made my mods.  Honestly!  I'd have to 
say that Phil's success was due to something else, not me.

Phil, if you have the Flex console in one folder and my Console in 
another, try running them again and see what happens.  Make sure 
*everything* is set up exactly the same between the two consoles:  Audio 
buffer size, dsp buffer size, leveler on/off, xmit filter bandwidths, tx 
eq, effects such as compander (etc.), ALC parameters (in the DSP menu), 
mic gain, drive, etc.  Do they still sound different over-the-air.

I would be very curious to know what your results are!

Thanks,

- Jeff

Eric Wachsmann wrote:
> Phil,
>
> Jeff Anderson can correct me if I'm wrong, but I don't believe he's changed
> any source that would affect RFI.  This sounds to me like a difference in
> setup paramaters causing the difference in performance.  Have you tried
> importing your database from the K6JCA version into the trunk version?
> Whatever the case, I'm glad that it's working for you.
>
>
> Eric Wachsmann
> FlexRadio Systems
>
>   
>> -Original Message-
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>> radio.biz] On Behalf Of Phil LaMarche
>> Sent: Sunday, January 20, 2008 11:13 AM
>> To: Flexradio@flex-radio.biz
>> Subject: [Flexradio] K6JCA download
>>
>>
>> I would like to report an interesting happening.  I have a Flex 5000 and
>> have run it on the regular down load and the beta version.  When
>> operating,
>> everyone said I had RFI on the signal as well as other audio comments.
>> Running a EV 27 directly in the front with the equalizer.  Down loaded the
>> K6JCA, which I love the looks and features, and all the audio problems
>> disappeared.  Every one is raving.  With the other versions I tried
>> everything from chokes to ferrite.  Can't explain but happy.
>>
>> Phil
>> 
>
>
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Re: [Flexradio] XG1

[Jeff Anderson]

Hi Kerry,

Sounds like you need to perform a receiver Image Rejection.  If you have 
an SDR1000, it should be in the setup menus.

- Jeff, K6JCA

kerry brown wrote:
> Hi Folks
> is there anybody that has used the XG1 for calibration. Should 
> there be
> two signals, I am getting one on 7.040 and another on 7.062, is this normal.
> As there is two signals what one is right? Should I set the calibration from 
> the 7.040 or the 7.02. When on 14mhz the radio seems to be 22kh out. Alas I 
> cannot hear
> any wwv or any am stations are to wide. Hope anyone can help? or is it better 
> to delete srd 1.10.3 and start again. It receives well but I do not think it 
> is in frequency.
>  
> Any Help G7EXO Thanks
>
>
> -
> Be a better friend, newshound, and know-it-all with Yahoo! Mobile.  Try it 
> now.
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Re: [Flexradio] (no subject)

[Jeff Anderson]

Do you guys know at about what frequency the tone is?

I don't know if this is related or not, but I was just testing out my 
new 5000 this morning (using my version of the Console which I'd 
compiled back on the 15th or so), and, when in TUNE mode, I noticed that 
there was a bit of AM modulation on the signal (I monitor the RF with an 
external oscilloscope), which surprised me: I would have expected a 
clean signal.  Modulation frequency was about 600 Hz, per my scope.

If I get time today, I'll go back to the 1000 and see what's happening 
with that...

- Jeff, k6jca

Tim Ellison wrote:
> Ray,
>
> I have powered speakers plugged directly into the "Pwr Spkr Line Out" jack on 
> the rear panel of the Flex-5000A and I hear a pure tone in the correct 
> speakers.  The left tone is a little higher in pitch than the right.  I also 
> observe the same behavior listening with my headphones.  I am using SVN 1917.
>
> -Tim
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray, K9DUR
> Sent: Friday, January 18, 2008 10:24 AM
> To: Flex-Radio E-Mail Reflector
> Subject: [Flexradio] (no subject)
>
> Before I post a bug report, I wonder if anyone else has noticed the following 
>  behavior on the audio balance test:
>
> 1.  Release version 1.10.3 - No audio tones heard.
> 2.  SVN 1905 - Pure audio tones, but reversed.  Left in right 
> speaker/headphone, right in left.
> 3.  SVN 1917 - Audio tones are still reversed, but tone is not pure.
>
> My headset is a Heil ProSet Plus plugged into "Phones" jack on front panel of 
> Flex-5000A.
>
> My speaker setup is a stereo cable plugged into the "Pwr Spkr Line Out" jack 
> on the rear panel of the Flex-5000A with the other end plugged into the line 
> input jack of my on-board PC sound card.
>
> The left/right channels were not reversed with my SDR-1000.
>
> 73, Ray, K9DUR
>
>
>
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Re: [Flexradio] Console resizing now in K6JCA branch of SVN

[Jeff Anderson]

Hi Alan,

You don't need my "resizing" function in order to add more buttons.  
Whoever want to add these buttons just needs to make a larger console 
(or add them to either a new Tab or somewhere in the Setup menus).   I 
added this feature because I wanted to get more panadapter resolution 
with my monitor that's 1280 pixels wide.

- Jeff

Alan NV8A wrote:
> On 01/15/08 08:15 pm Jeff Anderson wrote:
>
>> Console resizing is now in my branch (k6jca) of the SVN.  You can 
>> increase the display size both horizontally & vertically 
>> (independently).  Note, though, that larger displays will require 
>> more CPU power, so if you start hearing pops, go back to a smaller 
>> size.  Controls are in Setup>Appearance>Display.
>>
>> Console sizes range from the 'stock' size of 1024 x 624 pixels (h x 
>> 4) to 1920 x 1200 pixels.
>>
>> Please see me blog ([EMAIL PROTECTED]) for more info.  Also, please 
>> answer the *new* poll question regarding resizing!
>>
>> Let me know how it works...
>
> It looks good.
>
> I assume that this would enable the addition of another row of 
> controls -- e.g., for the "normal," "180-degree" and "bi-directional" 
> buttons for SteppIR users.
>

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Re: [Flexradio] A proposal

[Jeff Anderson]

I completely understand.  Thanks, Bob!

- Jeff

Bob Cowdery wrote:
> Hi Jeff
>
> You are right, there is always another language. However, I'm firmly on
> the bandwagon with FP. Functional programming is being recognised
> (again), and concurrency is key to future systems. So whether its
> Erlang, F# or something else it's not a bad thing to start learning. If
> this goes ahead I would ensure each component as it is put forward for
> scrutiny is fully and properly commented. I think I do that anyway but I
> know, when I look back at code it's not always the case!
>
> Bob  
>
> On Wed, 2008-01-16 at 11:01 -0800, Jeff Anderson wrote:
>   
>> Sounds like a worthwhile endeavor, Bob (although I'm not sure I want to 
>> learn yet *another* language).
>>
>> But what I'm really wondering about this new effort (especially with an 
>> uncommon language like Erlang) is...will the code be commented?
>>
>> Thanks!
>>
>> - Jeff, K6JCA
>>
>> Bob Cowdery wrote:
>> 
>>> Hi all
>>>
>>> If you are not in the slightest interested in delving into some of the
>>> software engineering behind all the wonderful SDR hardware available
>>> then please disregard this message.
>>>
>>> The purpose of this message is to gauge interest in learning how to
>>> apply Erlang to SDR implementations. Anybody who has been following
>>> along with the messages on the various forums must be aware that Erlang
>>> is an integral part of some future architectures. I happen to believe in
>>> its capabilities and therefore want to promote its use. I am not
>>> implying that what I am doing is in any way the actual implementation of
>>> that future, just that it's a good base from which to start learning.
>>>
>>> My proposal would be along the following lines. A set of tutorial based
>>> sessions with supporting software and text. These would be delivered
>>> over Skype or some other similar forum. The sessions would build up to a
>>> working radio using the building blocks that I have developed. Each
>>> component (primarily the Erlang parts) of the architecture would
>>> therefore be explained in detail and thus the Erlang language would be
>>> taught by example after perhaps a primer session. The intention would be
>>> not just to explain what is there but to enable experimentation by
>>> building new parts to plug into the architecture and explore ways to
>>> improve and enhance the design.
>>>
>>> I would expect to cover the following topics.
>>>
>>> 1. Why Erlang? Installation of Erlang, dev tools and a language primer.
>>> 2. Context, how the Erlink-SR architecture fits together. How messages
>>> are routed.
>>> 3. The message routing component explained with a test harness to
>>> experiment with.
>>> 4. Linking to C code. How do linked-in drivers work. How is data
>>> marshaled between the Erlang and C sides. An explanation of the Erlang
>>> 'C' helper library. Supported with simple examples to play with.
>>> 5. The main data handing components explained and the use of shared
>>> memory. All these use linked-in-drivers to acquire, process and output
>>> sample data. Simple test harnesses will be used to exercise these
>>> components.
>>> 6. The Mnesia database explained and the radio database API with a test
>>> harness to exercise the database.
>>> 7. The Erlang bindings to wxWidgets explained with some simple
>>> stand-alone UI examples. The integration of wxErlang with Erlink-SR with
>>> a walk-through of the pattern for creating new widgets and how they
>>> interact with the system.
>>> 8. Driving the hardware, a walk through the hardware component and a
>>> test harness to exercise it.
>>> 9. Putting it all together. The OTP (Open Telecomms Platform). The FSM
>>> (the OTP FSM behaviour, not to be confused with anything else going by
>>> that name) at the centre of the system, what it does and how it does it.
>>> The system startup and shutdown.
>>> 10. Running the radio. What's missing and discussions of how to address
>>> the missing parts and build out new capability.
>>> 11. A quick look at the Java integration using erlink-j.
>>>
>>> You should come out of this knowing a lot about Erlang and have an SDR
>>> system you understand sufficiently to be able to experiment with and
>>> contribute to. A couple of provisos. The system is not finished yet but
>&g

Re: [Flexradio] A proposal

[Jeff Anderson]

Sounds like a worthwhile endeavor, Bob (although I'm not sure I want to 
learn yet *another* language).

But what I'm really wondering about this new effort (especially with an 
uncommon language like Erlang) is...will the code be commented?

Thanks!

- Jeff, K6JCA

Bob Cowdery wrote:
> Hi all
>
> If you are not in the slightest interested in delving into some of the
> software engineering behind all the wonderful SDR hardware available
> then please disregard this message.
>
> The purpose of this message is to gauge interest in learning how to
> apply Erlang to SDR implementations. Anybody who has been following
> along with the messages on the various forums must be aware that Erlang
> is an integral part of some future architectures. I happen to believe in
> its capabilities and therefore want to promote its use. I am not
> implying that what I am doing is in any way the actual implementation of
> that future, just that it's a good base from which to start learning.
>
> My proposal would be along the following lines. A set of tutorial based
> sessions with supporting software and text. These would be delivered
> over Skype or some other similar forum. The sessions would build up to a
> working radio using the building blocks that I have developed. Each
> component (primarily the Erlang parts) of the architecture would
> therefore be explained in detail and thus the Erlang language would be
> taught by example after perhaps a primer session. The intention would be
> not just to explain what is there but to enable experimentation by
> building new parts to plug into the architecture and explore ways to
> improve and enhance the design.
>
> I would expect to cover the following topics.
>
> 1. Why Erlang? Installation of Erlang, dev tools and a language primer.
> 2. Context, how the Erlink-SR architecture fits together. How messages
> are routed.
> 3. The message routing component explained with a test harness to
> experiment with.
> 4. Linking to C code. How do linked-in drivers work. How is data
> marshaled between the Erlang and C sides. An explanation of the Erlang
> 'C' helper library. Supported with simple examples to play with.
> 5. The main data handing components explained and the use of shared
> memory. All these use linked-in-drivers to acquire, process and output
> sample data. Simple test harnesses will be used to exercise these
> components.
> 6. The Mnesia database explained and the radio database API with a test
> harness to exercise the database.
> 7. The Erlang bindings to wxWidgets explained with some simple
> stand-alone UI examples. The integration of wxErlang with Erlink-SR with
> a walk-through of the pattern for creating new widgets and how they
> interact with the system.
> 8. Driving the hardware, a walk through the hardware component and a
> test harness to exercise it.
> 9. Putting it all together. The OTP (Open Telecomms Platform). The FSM
> (the OTP FSM behaviour, not to be confused with anything else going by
> that name) at the centre of the system, what it does and how it does it.
> The system startup and shutdown.
> 10. Running the radio. What's missing and discussions of how to address
> the missing parts and build out new capability.
> 11. A quick look at the Java integration using erlink-j.
>
> You should come out of this knowing a lot about Erlang and have an SDR
> system you understand sufficiently to be able to experiment with and
> contribute to. A couple of provisos. The system is not finished yet but
> there is enough there to run the sessions and to run a receiver (SDR1000
> only at the moment) under Windows. The C code is not ported to Linux yet
> so if you have only Linux you won't be able to run everything. You will
> need to have had some programming experience to get full benefit but you
> should be able to follow along and try the built examples without any
> previous experience.
>
> Now for the crunch. Obviously, this would involve me in a lot of effort
> and I would be looking to cover some of my time by charging a nominal
> fee per session. I would want to keep that very low, maybe something
> like $10 a session. If there are enough people interested to make it
> viable I will make it happen.
>
> A final plea. I don't want to start any discussions about technologies,
> operating systems etc. Please don't use this message as a bouncing
> board. 
>
> 73
> Bob
> G3UKB
> http://www.g3ukb.co.uk  (there is a problem with my ISP at the moment so
> the web site is unavailable, but hopefully fixed soon).
>
>
>
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Re: [Flexradio] Display suggestion: LOCK function

[Jeff Anderson]

Thanks for the comments, John!

One note I should make...if your video card is set to 120 dpi instead of 
96 dpi and you try to adjust your Console size, you'll see the Console 
controls suddenly get scrunched together as you start to change the 
size.  But all is not lost.  If, after setting the sizes to the values 
you want, you close the Console and then relaunch it, everything should 
be copacetic (and with the new size settings applied).

I'm not sure what the fix is (or if there is a fix!), but, given that 
you can make it right by relaunching the console, it isn't a complete 
disaster.  Meanwhile, I'll try to figure out what's going on...

73!

- Jeff

N3WT wrote:
> Jeff,
>
> Go for it big guy!  you are the Man!
>
>  Thank you for all the great enhancements.  I really like the new waterfall
> combo.
>
> The new resizing and multi color choices are also nice for eye appeal.  XYL
> wanted to know what new software I just bought.
>
> This new LOCK function sounds very useful.
>
> John, N3WT
>
>
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Jeff Anderson
> Sent: Wednesday, January 16, 2008 10:24 AM
> To: [EMAIL PROTECTED]
> Cc: Reflector Flex-Radio
> Subject: Re: [Flexradio] Display suggestion: LOCK function
>
>
> Hi Ed,
>
> I very much like the fixed-display idea (Chris, HB9AJP has also pitched
> the same idea for me).  It'd be great when using the split
> panadapter/waterfall mode, because you'd no longer see the waterfall
> zigging and zagging as you change frequency.
>
> How difficult is it to do?  I don't know - it probably depends upon a
> number of things that I'll only discover when I begin to dig into the
> code.  Hopefully it's straightforward; after all, the second receiver in
> the multi-rx feature that's already incorporated in the Console
> essentially does this already (the display remains fixed while you tune
> it).  Can this be extended to the first (VFO A) receiver?  I hope so.
> I'll try to check into it when I get some time, probably later this week.
>
> - Jeff, k6jca
>
> Ed Russell wrote:
>   
>> Jack,
>>
>> Great work on the combo display. There is one more feature that would
>> be helpful and probably not that hard to implement. In additon to the
>> CENTER button, there could be a LOCK button. When the display is
>> locked, tuning would not change the frequency range being shown.
>> Instead, tuning would move the filter display and other indicators.
>>
>> This LOCK feature would allow tuning around in the bandpass of the
>> panadapter and/or waterfall display without having the display
>> constantly shift and become garbled.
>>
>> Thanks again for your great contribution.
>>
>> 73 Ed W2RF
>>
>> On 15 Jan 2008 at 17:15, Jeff Anderson wrote:
>>
>>
>> 
>>> Console resizing is now in my branch (k6jca) of the SVN.  You can
>>> increase the display size both horizontally & vertically
>>> (independently).  Note, though, that larger displays will require more
>>> CPU power, so if you start hearing pops, go back to a smaller size.
>>> Controls are in Setup>Appearance>Display.
>>>
>>> Console sizes range from the 'stock' size of 1024 x 624 pixels (h x 4)
>>> to 1920 x 1200 pixels.
>>>
>>> Please see me blog ([EMAIL PROTECTED]) for more info.  Also, please
>>> answer the *new* poll question regarding resizing!
>>>
>>> Let me know how it works...
>>>
>>> Thanks!
>>>
>>> - Jeff, k6jca
>>>
>>> ___
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>>> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
>>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
>>> Knowledge Base: http://kb.flex-radio.com/  Homepage:
>>>   
> http://www.flex-radio.com/
>   
>>>   
>>
>>
>>
>> 
>
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Re: [Flexradio] Display suggestion: LOCK function

[Jeff Anderson]

Hi Ed,

I very much like the fixed-display idea (Chris, HB9AJP has also pitched 
the same idea for me).  It'd be great when using the split 
panadapter/waterfall mode, because you'd no longer see the waterfall 
zigging and zagging as you change frequency.

How difficult is it to do?  I don't know - it probably depends upon a 
number of things that I'll only discover when I begin to dig into the 
code.  Hopefully it's straightforward; after all, the second receiver in 
the multi-rx feature that's already incorporated in the Console 
essentially does this already (the display remains fixed while you tune 
it).  Can this be extended to the first (VFO A) receiver?  I hope so.  
I'll try to check into it when I get some time, probably later this week.

- Jeff, k6jca

Ed Russell wrote:
> Jack,
>
> Great work on the combo display. There is one more feature that would 
> be helpful and probably not that hard to implement. In additon to the 
> CENTER button, there could be a LOCK button. When the display is 
> locked, tuning would not change the frequency range being shown. 
> Instead, tuning would move the filter display and other indicators.
>
> This LOCK feature would allow tuning around in the bandpass of the 
> panadapter and/or waterfall display without having the display 
> constantly shift and become garbled.
>
> Thanks again for your great contribution.
>
> 73 Ed W2RF
>
> On 15 Jan 2008 at 17:15, Jeff Anderson wrote:
>
>   
>> Console resizing is now in my branch (k6jca) of the SVN.  You can 
>> increase the display size both horizontally & vertically 
>> (independently).  Note, though, that larger displays will require more 
>> CPU power, so if you start hearing pops, go back to a smaller size.  
>> Controls are in Setup>Appearance>Display.
>>
>> Console sizes range from the 'stock' size of 1024 x 624 pixels (h x 4) 
>> to 1920 x 1200 pixels.
>>
>> Please see me blog ([EMAIL PROTECTED]) for more info.  Also, please 
>> answer the *new* poll question regarding resizing!
>>
>> Let me know how it works...
>>
>> Thanks!
>>
>> - Jeff, k6jca
>>
>> ___
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>> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
>> Knowledge Base: http://kb.flex-radio.com/  Homepage: 
>> http://www.flex-radio.com/
>>
>> 
>
>
>
>
>   

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[Flexradio] Console resizing now in K6JCA branch of SVN

[Jeff Anderson]

Console resizing is now in my branch (k6jca) of the SVN.  You can 
increase the display size both horizontally & vertically 
(independently).  Note, though, that larger displays will require more 
CPU power, so if you start hearing pops, go back to a smaller size.  
Controls are in Setup>Appearance>Display.

Console sizes range from the 'stock' size of 1024 x 624 pixels (h x 4) 
to 1920 x 1200 pixels.

Please see me blog ([EMAIL PROTECTED]) for more info.  Also, please 
answer the *new* poll question regarding resizing!

Let me know how it works...

Thanks!

- Jeff, k6jca

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[Flexradio] Selectable Screen Sizes

[Jeff Anderson]

I've always wanted to be able to change the Horizontal size of my  
Console to take advantage of my 1280 pixel wide monitor, but I never 
could figure out how to do it as a "selectable" option.  Well, I've 
finally figured it out (I think).

If you go to my blog (k6jca.blogspot.com), you'll see an example of a 
Console that's 1280 pixels wide instead of the "stock" 1024 pixels.  
It's still crude - I need to move controls around to make it look nice, 
but it shows that it can be done.

So...at some point in time (probably around the end of this week) I'll 
try to put out another Console with selectable sizes.  Currently I'm 
just planning on two choices (1024 or 1280 pixels wide, no change to 
vertical height).  I *might* be able to add additional choices, 
including other vertical sizes, depending upon the amount of work 
required.  What would you like to see? 

Please email me with your suggestions!  I'd like to know how large you'd 
like the Console to be Horizontally, and how large Vertically (if you 
don't need a change vertically, then don't bother to mention it).  Each 
combo of H and V sizes is going to require repositioning a number of 
things (and first figuring out where they should be repositioned), so 
the fewer options I allow, the easier it'll be for me.  Please let me 
know only the most important one or two for you.

Also - several people have asked if I can scale everything up, including 
buttons and fonts, for larger resolution screens.  Although there might 
be a simple way of doing this, I don't have a clue what it is.  It looks 
like it would take a *tremendous* amount of work, because I'd have to 
change the size of *everything* on the screen, including the fonts for 
each button, etc.  Honestly, I can't see doing this - life is too short 
as it is.  (If someone knows the secret to simplify this, please let me 
know!)

Again, let me know what you'd like to see for screen sizes, and don't 
forget to take the poll on the blog!

Thanks,

- Jeff, k6jca

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Re: [Flexradio] New Features on my Console, and a Poll...

[Jeff Anderson]

Hi Edwin,

Thanks for the note...which features from the old console were you 
thinking of?

By the way - the features I've added  are ones that I felt that I needed 
(with few exceptions), and that weren't in the current "official" Flex 
Console, and so I decided to implement them myself.  I see myself as 
sort of a trailblazer, or perhaps more apt,  spaghetti-maker.  Flex is 
more than welcome to take my ideas, toss them against the wall, and see 
which ones stick (which is part of the rationale for my poll at my 
blog).  I realize that features which I might deem absolutely necessary 
may not be as important to others as they are to me.

73,

- Jeff, k6jca

Edwin Marzan wrote:
> I have yet to see any features implemented that were not useful. 
> However, it would be nice if the features from the old console would 
> be reimplemented in the new console. That may be a tough one.
>  
> It is amazing how quickly you can churn out these new features! I also 
> hope the new features can be carried over to the new architecture.  I 
> guess that would depend on whether the folks at Flex plan on a 
> different implementation.
>  
>
> Edwin Marzan
> AB2VW
>
>
>
>
> 
> Share life as it happens with the new Windows Live. Start sharing! 
> 

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[Flexradio] New Features on my Console, and a Poll...

[Jeff Anderson]

I've added the ability to my version of the Console to allow changing 
additional colors so that you can make some *very* cool looking 
Consoles.  (See my blog for a great example:  http://k6jca.blogspot.com/ )

Also - I'm trying to get an idea of how useful some of my additions 
are.  If you have minute or two, could you please go to my blog and vote 
on a short poll?  You don't need to have downloaded my Console to vote - 
even if you haven't used it, you can still say if you like (or don't 
like) the "idea" of the features.

Thanks!!

- Jeff, k6jca



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Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

I just ran some additional tests on 3.797 MHz (this
frequency per Edwin's original video).  You can read
my writeup at my blog:
  
http://k6jca.blogspot.com/

- Jeff, k6jca


> --
> From: "Jeff Anderson" <[EMAIL PROTECTED]>
> Sent: Friday, January 11, 2008 2:23 PM
> To: "Edwin Marzan" <[EMAIL PROTECTED]>
> Cc: 
> Subject: Re: [Flexradio] Mysterious Spur Visible on
> Panadaptor
> 
> > By the way, Edwin - it's possible that what you're
> seeing *aren't* DDS
> > spurs.  I'll do some more testing here, too, over
> the weekend.
> >
> > Do you happen to have a Radio Shack common-mode
> filter?
> >
> > - Jeff
> >
> > Jeff Anderson wrote:
> >> Hi Edwin,
> >>
> >> I think what you are seeing might be DDS spurs.
> >>
> >> I just did some additional testing with my
> SDR1000 that's using a Delta
> >> 44, as well as some testing with a seperate
> SDR1000 that uses an Edirol
> >> (and a different computer).
> >>
> >> With each console setup up similarly:
> >> o  SR = Off  (spur reduction)
> >> o  PreAmp = Med
> >> o  Mode = LSB
> >> o  DDS Clock Offset = 0 (this is important for
> comparing one radio to
> >> another!).  It's in one of the Setup menus (you
> need to check the
> >> "expert" box).
> >> o  Antenna:  connect to dummy load.
> >>
> >> If I tune each Console to 7.002 MHz, I see spurs
> at exactly 1 KHz
> >> spacing.  If I then detune by *only* 1 Hz (that's
> Hz, not KHz), the
> >> spurs change frequency by an amount much greater
> than 1 Hz, which is
> >> what I would expect for DDS-generated spurs.
> >>
> >> Both my system with the Delta 44 and my system
> with the Edirol
> >> experience the same problem.
> >>
> >> Note too:  one of the spus (I think it's the one
> at 7.001 MHz) I can
> >> attenuate by attaching a Radio Shack common-mode
> choke in series with
> >> the cable attached to the "To Line Out" jack of
> the SDR - so there seems
> >> to also be a second source for a spur at this
> frequency, and thus some
> >> interaction between it and the DDS spur on the
> same frequency).  And, if
> >> I change the vfo by 1 Hz, it moves by the same
> amount, too, again
> >> implying that it's not DDS spurs.
> >>
> >> Usually DDS spurs aren't a problem, because,
> except for certain
> >> frequencies (around 7.15 MHz on my radio, for
> example), their amplitude
> >> lies below the "atmospheric" noise floor.
> >>
> >> Try testing your other frequencies, too, that you
> show in the video.  If
> >> you move the frequency by only 1 Hz, do the spurs
> move by the same
> >> amount, or by a much different amount?
> >>
> >> - Jeff, k6jca
> >>
> >> Edwin Marzan wrote:
> >>
> >>> Hi Jeff,
> >>>
> >>> The setup is very simple. Astron VS-20M Power
> supply, SDR-1000, Eridol
> >>> FA66, HP Computer, MFJ Tuner (no power supply),
> Creative Labs
> >>> Speakers. Switched on and off all other
> equipment at home and no luck.
> >>> Receiver is calibrated with Elecraft XG-1. IF
> was changed from 11.25
> >>> (I think) to 9 or somesuch via PowerSDR. Noise
> level is very high here
> >>> in the Bronx. I see the same high levels with my
> other transceivers. I
> >>> don't see any other patterns other than 1 khz
> spacing that you noticed
> >>> on the waterfall display. I'm going to see if my
> older version of
> >>> PowerSDR exhibits this same behavior.
> >>>
> >>> Thanks for the suggestions!
> >>>
> >>> Edwin Marzan
> >>> AB2VW
> >>>
> >>>
> >>>
>
=
> >>>
> >>>
> >>>
> >>>> Date: Thu, 10 Jan 2008 10:31:17 -0800
> >>>> From: [EMAIL PROTECTED]
> >>>> To: [EMAIL PROTECTED]
> >>>> CC: flexradio@flex-radio.biz
> >>>> Subject: Re: [Flexradio] Mysterious Spur
> Visible on Panadaptor
> >>>>
> >>>> Mike's (w6thw) suggestion is a good one. Switch
> off all other equipment
> >>>> and see if it goes away.
> >>&g

Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

By the way, Edwin - it's possible that what you're seeing *aren't* DDS 
spurs.  I'll do some more testing here, too, over the weekend.

Do you happen to have a Radio Shack common-mode filter?

- Jeff

Jeff Anderson wrote:
> Hi Edwin,
>
> I think what you are seeing might be DDS spurs.
>
> I just did some additional testing with my SDR1000 that's using a Delta 
> 44, as well as some testing with a seperate SDR1000 that uses an Edirol 
> (and a different computer).
>
> With each console setup up similarly:
> o  SR = Off  (spur reduction)
> o  PreAmp = Med
> o  Mode = LSB
> o  DDS Clock Offset = 0 (this is important for comparing one radio to 
> another!).  It's in one of the Setup menus (you need to check the 
> "expert" box).
> o  Antenna:  connect to dummy load.
>
> If I tune each Console to 7.002 MHz, I see spurs at exactly 1 KHz 
> spacing.  If I then detune by *only* 1 Hz (that's Hz, not KHz), the 
> spurs change frequency by an amount much greater than 1 Hz, which is 
> what I would expect for DDS-generated spurs.
>
> Both my system with the Delta 44 and my system with the Edirol 
> experience the same problem.
>
> Note too:  one of the spus (I think it's the one at 7.001 MHz) I can 
> attenuate by attaching a Radio Shack common-mode choke in series with 
> the cable attached to the "To Line Out" jack of the SDR - so there seems 
> to also be a second source for a spur at this frequency, and thus some 
> interaction between it and the DDS spur on the same frequency).  And, if 
> I change the vfo by 1 Hz, it moves by the same amount, too, again 
> implying that it's not DDS spurs.
>
> Usually DDS spurs aren't a problem, because, except for certain 
> frequencies (around 7.15 MHz on my radio, for example), their amplitude 
> lies below the "atmospheric" noise floor.
>
> Try testing your other frequencies, too, that you show in the video.  If 
> you move the frequency by only 1 Hz, do the spurs move by the same 
> amount, or by a much different amount?
>
> - Jeff, k6jca
>
> Edwin Marzan wrote:
>   
>> Hi Jeff,
>>  
>> The setup is very simple. Astron VS-20M Power supply, SDR-1000, Eridol 
>> FA66, HP Computer, MFJ Tuner (no power supply), Creative Labs 
>> Speakers. Switched on and off all other equipment at home and no luck. 
>> Receiver is calibrated with Elecraft XG-1. IF was changed from 11.25 
>> (I think) to 9 or somesuch via PowerSDR. Noise level is very high here 
>> in the Bronx. I see the same high levels with my other transceivers. I 
>> don't see any other patterns other than 1 khz spacing that you noticed 
>> on the waterfall display. I'm going to see if my older version of 
>> PowerSDR exhibits this same behavior.
>>  
>> Thanks for the suggestions!
>>
>> Edwin Marzan
>> AB2VW
>>
>>
>> =
>>  
>>  
>> 
>>> Date: Thu, 10 Jan 2008 10:31:17 -0800
>>> From: [EMAIL PROTECTED]
>>> To: [EMAIL PROTECTED]
>>> CC: flexradio@flex-radio.biz
>>> Subject: Re: [Flexradio] Mysterious Spur Visible on Panadaptor
>>>
>>> Mike's (w6thw) suggestion is a good one. Switch off all other equipment
>>> and see if it goes away.
>>>
>>> Also - your noise floor looks pretty high to me (compared to what I see
>>> on my SDR). What is your preamp set to? The high noise *may* be
>>> indicative of an incorrectly calibrated receiver - do you have a good,
>>> calibrated, RF source that you can use to calibrate the receiver
>>> levels? I'm wondering if these tones are actually really far down in
>>> level (below the A/D's threshold), but, because input gain is too high,
>>> they're being digitized by the A/D and appearing as real (albeit faint)
>>> signals) - but I'm really just guessing here. I don't know if the
>>> Edirol has a preamp prior to the A/D (many A/D's do), nor if Flex
>>> controls the gain of this preamp. If not, that is, if gain is only
>>> applied in software, then this thought is probably wrong - but you may
>>> still need to calibrate the receiver.
>>>
>>> By the way, if you don't have a calibrated RF generator that you trust,
>>> Elecraft makes one that is perfect for something like this (I recommend
>>> that all hams have one).
>>>
>>> If you're still not having any luck, more clues might be gained by
>>> looking at the entire panadapter display (zoom all the w

Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

Hi Edwin,

I think what you are seeing might be DDS spurs.

I just did some additional testing with my SDR1000 that's using a Delta 
44, as well as some testing with a seperate SDR1000 that uses an Edirol 
(and a different computer).

With each console setup up similarly:
o  SR = Off  (spur reduction)
o  PreAmp = Med
o  Mode = LSB
o  DDS Clock Offset = 0 (this is important for comparing one radio to 
another!).  It's in one of the Setup menus (you need to check the 
"expert" box).
o  Antenna:  connect to dummy load.

If I tune each Console to 7.002 MHz, I see spurs at exactly 1 KHz 
spacing.  If I then detune by *only* 1 Hz (that's Hz, not KHz), the 
spurs change frequency by an amount much greater than 1 Hz, which is 
what I would expect for DDS-generated spurs.

Both my system with the Delta 44 and my system with the Edirol 
experience the same problem.

Note too:  one of the spus (I think it's the one at 7.001 MHz) I can 
attenuate by attaching a Radio Shack common-mode choke in series with 
the cable attached to the "To Line Out" jack of the SDR - so there seems 
to also be a second source for a spur at this frequency, and thus some 
interaction between it and the DDS spur on the same frequency).  And, if 
I change the vfo by 1 Hz, it moves by the same amount, too, again 
implying that it's not DDS spurs.

Usually DDS spurs aren't a problem, because, except for certain 
frequencies (around 7.15 MHz on my radio, for example), their amplitude 
lies below the "atmospheric" noise floor.

Try testing your other frequencies, too, that you show in the video.  If 
you move the frequency by only 1 Hz, do the spurs move by the same 
amount, or by a much different amount?

- Jeff, k6jca

Edwin Marzan wrote:
> Hi Jeff,
>  
> The setup is very simple. Astron VS-20M Power supply, SDR-1000, Eridol 
> FA66, HP Computer, MFJ Tuner (no power supply), Creative Labs 
> Speakers. Switched on and off all other equipment at home and no luck. 
> Receiver is calibrated with Elecraft XG-1. IF was changed from 11.25 
> (I think) to 9 or somesuch via PowerSDR. Noise level is very high here 
> in the Bronx. I see the same high levels with my other transceivers. I 
> don't see any other patterns other than 1 khz spacing that you noticed 
> on the waterfall display. I'm going to see if my older version of 
> PowerSDR exhibits this same behavior.
>  
> Thanks for the suggestions!
>
> Edwin Marzan
> AB2VW
>
>
> =
>  
>  
> > Date: Thu, 10 Jan 2008 10:31:17 -0800
> > From: [EMAIL PROTECTED]
> > To: [EMAIL PROTECTED]
> > CC: flexradio@flex-radio.biz
> > Subject: Re: [Flexradio] Mysterious Spur Visible on Panadaptor
> >
> > Mike's (w6thw) suggestion is a good one. Switch off all other equipment
> > and see if it goes away.
> >
> > Also - your noise floor looks pretty high to me (compared to what I see
> > on my SDR). What is your preamp set to? The high noise *may* be
> > indicative of an incorrectly calibrated receiver - do you have a good,
> > calibrated, RF source that you can use to calibrate the receiver
> > levels? I'm wondering if these tones are actually really far down in
> > level (below the A/D's threshold), but, because input gain is too high,
> > they're being digitized by the A/D and appearing as real (albeit faint)
> > signals) - but I'm really just guessing here. I don't know if the
> > Edirol has a preamp prior to the A/D (many A/D's do), nor if Flex
> > controls the gain of this preamp. If not, that is, if gain is only
> > applied in software, then this thought is probably wrong - but you may
> > still need to calibrate the receiver.
> >
> > By the way, if you don't have a calibrated RF generator that you trust,
> > Elecraft makes one that is perfect for something like this (I recommend
> > that all hams have one).
> >
> > If you're still not having any luck, more clues might be gained by
> > looking at the entire panadapter display (zoom all the way out) . Are
> > there any patterns?
> >
> > Also - what's the IF frequency set to?
> >
> > Thanks,
> >
> > - Jeff, k6jca
> >
> >
> >
> > Edwin Marzan wrote:
> > > Hmmm there is a switching power supply powering another 
> transceiver nearby. I'll see what happens when I turn it off.
> > >
> > > Thanks for the info.Edwin MarzanAB2VW
> > >
> > >
> > > Date: Thu, 10 Jan 2008 09:09:48 -0800From: 
> [EMAIL PROTECTED]: Re: [Flexradio] Mysterious Spur Visible on 
> PanadaptorTo: [EMAIL PROTECTED]
> > > Hi are you using a switching power supply if so try another one 
> and see if it still there.
> > > Just thought it might be the same thing i had happen on all bands.
> > >
> > >
>
>
> 
> Put your friends on the big screen with Windows Vista® + Windows 
> Live™. Start now! 
> 

Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

Mike's (w6thw) suggestion is a good one.  Switch off all other equipment 
and see if it goes away.

Also - your noise floor looks pretty high to me (compared to what I see 
on my SDR).  What is your preamp set to?  The high noise *may* be 
indicative of an incorrectly calibrated receiver - do you have a good, 
calibrated, RF source that you can use to calibrate the receiver 
levels?  I'm wondering if these tones are actually really far down in 
level (below the A/D's threshold), but, because input gain is too high, 
they're being digitized by the A/D and appearing as real (albeit faint) 
signals) - but I'm really just guessing here.  I don't know if the 
Edirol has a preamp prior to the A/D (many A/D's do), nor if Flex 
controls the gain of this preamp.  If not, that is, if gain is only 
applied in software, then this thought is probably wrong - but you may 
still need to calibrate the receiver. 

By the way, if you don't have a calibrated RF generator that you trust, 
Elecraft makes one that is perfect for something like this (I recommend 
that all hams have one).

If you're still not having any luck, more clues might be gained by 
looking at the entire panadapter display (zoom all the way out) .  Are 
there any patterns?

Also - what's the IF frequency set to?

Thanks,

- Jeff, k6jca



Edwin Marzan wrote:
> Hmmm there is a switching power supply powering another transceiver 
> nearby. I'll see what happens when I turn it off.
>  
> Thanks for the info.Edwin MarzanAB2VW
>
>
> Date: Thu, 10 Jan 2008 09:09:48 -0800From: [EMAIL PROTECTED]: Re: [Flexradio] 
> Mysterious Spur Visible on PanadaptorTo: [EMAIL PROTECTED]
> Hi are you using a switching power supply if so try another one and see if it 
> still there.
> Just thought it might be the same thing i had happen on all bands.
>  
>   

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Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

One more question...is there any change to the spur's frequency if you 
change sample rates?  (E.g. try 48 KHz, 96KHz, etc.)

- Jeff

Jeff Anderson wrote:
> Hi Ed,
>
> Great video!  (I have to say, the combined panadapter/waterfall display 
> does a great job showing your problem).
>
> I just checked my radio (an SDR1000, too) at the same frequencies you 
> showed, and I have no spurs.
>
> What's interesting about your video is that, in addition to the main 
> spur, there are also lower level spurs at deltas that seem to be in 
> multiples of exactly 1 KHz (you can see these better in the waterfall 
> than in the panadapter).
>
> Also - the tones sound pure, not noisy, so I don't believe this is 
> digital noise, per se (although it could be clock related).
>
> One thing you might want to check is to see if the tones are being 
> generated within the Edirol or the SDR1000.  I'd recommend disconnecting 
> only the "receive" audio that goes from the SDR to the Edirol (I've 
> forgotten which one this is).  Are the tones still there?  If so, then 
> the spurs are being generated within the Edirol.  If not, then something 
> is happening externally to your computer/soundcard system.   Something 
> could be coupling into the cabling (a clock of some sort?), or something 
> might be happening within the SDR.
>
> You might want to describe your setup further...what else connects to 
> the SDR?  For example, do you have the external clock option?  What 
> other sources of equipment connect to your radio/computer system?
>
> Best of luck!
>
> - Jeff, k6jca
>
>
> Edwin Marzan wrote:
>   
>> Hi Folks,
>>  
>> I've uploaded a video of my panadaptor which shows a mysterious spur that I 
>> am unable to remove (in most cases) with spur reduction. It occurs mainly on 
>> Lower Side Band. I've heard the tone on previous versions as well but it is 
>> normally buried in the noise. The radio is connected to a dummy load. I'm 
>> using the SDR1000 with an Eridol FA66 and SVN1879. I'm able to operate the 
>> radio normally but hearing the tone in the background is a bit annoying. Let 
>> me know if you have any suggestions on how to remove it. I used the 
>> panadaptor/waterfall combo display in order to make it more visible.
>>  
>> And guys, please forgive me for the awkward narration!!
>>  
>> Thank you!
>>  
>>  
>> http://www.youtube.com/watch?v=RN5yooPYjtY
>> _
>> Put your friends on the big screen with Windows Vista® + Windows Live™.
>> http://www.microsoft.com/windows/shop/specialoffers.mspx?ocid=TXT_TAGLM_CPC_MediaCtr_bigscreen_012008
>> ___
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>> Knowledge Base: http://kb.flex-radio.com/  Homepage: 
>> http://www.flex-radio.com/
>>
>>
>>   
>> 
>
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Re: [Flexradio] Mysterious Spur Visible on Panadaptor

[Jeff Anderson]

Hi Ed,

Great video!  (I have to say, the combined panadapter/waterfall display 
does a great job showing your problem).

I just checked my radio (an SDR1000, too) at the same frequencies you 
showed, and I have no spurs.

What's interesting about your video is that, in addition to the main 
spur, there are also lower level spurs at deltas that seem to be in 
multiples of exactly 1 KHz (you can see these better in the waterfall 
than in the panadapter).

Also - the tones sound pure, not noisy, so I don't believe this is 
digital noise, per se (although it could be clock related).

One thing you might want to check is to see if the tones are being 
generated within the Edirol or the SDR1000.  I'd recommend disconnecting 
only the "receive" audio that goes from the SDR to the Edirol (I've 
forgotten which one this is).  Are the tones still there?  If so, then 
the spurs are being generated within the Edirol.  If not, then something 
is happening externally to your computer/soundcard system.   Something 
could be coupling into the cabling (a clock of some sort?), or something 
might be happening within the SDR.

You might want to describe your setup further...what else connects to 
the SDR?  For example, do you have the external clock option?  What 
other sources of equipment connect to your radio/computer system?

Best of luck!

- Jeff, k6jca


Edwin Marzan wrote:
> Hi Folks,
>  
> I've uploaded a video of my panadaptor which shows a mysterious spur that I 
> am unable to remove (in most cases) with spur reduction. It occurs mainly on 
> Lower Side Band. I've heard the tone on previous versions as well but it is 
> normally buried in the noise. The radio is connected to a dummy load. I'm 
> using the SDR1000 with an Eridol FA66 and SVN1879. I'm able to operate the 
> radio normally but hearing the tone in the background is a bit annoying. Let 
> me know if you have any suggestions on how to remove it. I used the 
> panadaptor/waterfall combo display in order to make it more visible.
>  
> And guys, please forgive me for the awkward narration!!
>  
> Thank you!
>  
>  
> http://www.youtube.com/watch?v=RN5yooPYjtY
> _
> Put your friends on the big screen with Windows Vista® + Windows Live™.
> http://www.microsoft.com/windows/shop/specialoffers.mspx?ocid=TXT_TAGLM_CPC_MediaCtr_bigscreen_012008
> ___
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> http://www.flex-radio.com/
>
>
>   

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Re: [Flexradio] Speaker Setup for SDR1 & 5K

[Jeff Anderson]

Hi Tim,

If your speakers are powered from 12 VAC, it might be possible to power 
them directly from 12 VDC, too, but it depends what their internal power 
supply circuitry looks like.  If the 12 VAC goes directly to a diode 
bridge within the speakers (for rectification), then you should be able 
to use 12 VDC in lieu of the 12 VAC, and polarity of the 12 VDC supply 
would be unimportant, because the diode bridge would automatically 
correct it.  (If a half-wave rectifier is used in lieu of a bridge, then 
polarity is important).

Might be worth further investigation...

- Jeff, k6jca

Tim Ellison wrote:
> I am using the Bose Companion2 speakers and I get a little RFI when I run my 
> IC-910h (VHF/UHF) at 100 watts but experience no problems on HF.
>
> My only complaint about them is that they are the only 12 VAC devices in the 
> shack, so I have to use the supplied "wall wart".  I would have preferred 
> 12-18 VDC speakers so I could wire them directly to the shack DC distribution 
> block.
>
> The external speakers should work fine, but you want to get some that have 
> extra shielding like the home theater center speakers that sit on top of your 
> TV.
>
> -Tim
> 
>
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of KQ8RP
> Sent: Wednesday, January 09, 2008 8:03 AM
> To: FlexRadio
> Subject: [Flexradio] Speaker Setup for SDR1 & 5K
>
> Like to here more of what people are using for there speakers for there SDR?
>
> I have seen within the knowledge base "Best Speaker List".
>
> I recently purchased a Altec Lansing VS4221 computer speaker set up and it 
> has very good sound and response.  But I can't use it on 75 meters that I 
> know of.  Just too much feedback and I have put ferrite cores all over the 
> place.
>
> I am using the SDR 1K and FA-66
>
> I went back to a small Infiniy computer set of speakers and have no issues 
> but don't get as good of sound.
>
> I am even open to setting up a tuner/amp and running out to some decent 
> bookshelf speakers but would just like to know more before I purchase 
> something.
>
> Thanks Much,
>
> Scott Gordon
> Phone: (888) 428-6622
> Fax (866) 505-7171
> http://www.kq8rp.us
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Re: [Flexradio] RE :K6JCA latest console

[Jeff Anderson]

Before I forget, John, there *is* an analog meter display on the Console 
(my original Console had two different analog meters, and I ditched one 
of them when I went to my new code ).  The existing analog meter is also 
in the Flex console, and it's an "edge" style meter which can be 
selected to replace the default "LED" meter.  You can select this edge 
meter via the Setup menus (I'm not sure which one - it might be 
Setup>Appearance>Meter).

If you go to my blog at http://k6jca.blogspot.com/, you'll see this edge 
meter in my Console.  Was this the one you were thinking of?

- Jeff

John Sweeney wrote:
>I seldom make a post, but had to on this.  I just downloaded Jeff's
> latest console on his SVN branch and love it.   The combo Waterfall and Pan
> is fantastic for CW and digital modes use.   The other features are great
> too.   Gave me that "ohhh man, cool"  moment when I first used it.I also
> seem to recall that there was a conventional analog meter display option too
> but don't see it now , how does one bring up the analog meter display, if
> still there?
>
> Thank you Jeff !!
>
> 73,  John  N3WT
>
>
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Jeff Anderson
> Sent: Sunday, January 06, 2008 9:46 AM
> To: Barry Jablonski
> Cc: flexradio@flex-radio.biz
> Subject: Re: [Flexradio] John Melton Java GUI (Dec 29 update)
>
> Thanks, Barry.
>
> If you're interested, you can find more info about it on my blog:
> http://k6jca.blogspot.com/
>
> (And again, my thanks to John Melton and his Java console for inspiring
> me to make the effort to add the combined panadapter/waterfall display
> to mine).
>
> Cheers!
>
> - Jeff, K6JCA
>
> Barry Jablonski wrote:
>   
>> Hi Jeff,
>>
>> I see that you made your console available via the svn.  Excellent!
>> Thanks for sharing.
>>
>> Barry
>> WB2ZXJ
>>
>> 
>
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Re: [Flexradio] Thanks!

[Jeff Anderson]

Thanks, Mark!  Hope you enjoy it.

By the way - I just updated the blog to describe, in more detail, my 
mods...

73,

- Jeff

Mark Amos wrote:
> Jeff, 
>
> Thanks for posting your console mods!  The panafall (waterpan?) display 
> is very cool and I'm enjoying the new snap feature.
>
> Very nice indeed!  Thanks for sharing it!
>
> Also, your comments on the 'comb' effect on the waterfall got me 
> thinking.  One of the reasons I've been enjoying the Flex radio is that 
> it provides some really interesting input for the visual sense 
> that "ordinary" radios don't.  I'm sure RTTY and other digital ops have 
> a similar sense of enjoyment in understanding some of the visual 
> artifacts that would otherwise go unnoticed if we were "only" listening 
> to signals.  I've loaded "CWGet" on my machine and enjoy watching the 
> CW as it comes in - seeing the cyclic fading provides a different 
> perspective than merely listening to it.
>
> Anyway, thanks again!
>
> Mark
> W8XR
>
>
>
> Thanks, Barry.
>
> If you're interested, you can find more info about it on my blog:
> http://k6jca.blogspot.com/
>
> (And again, my thanks to John Melton and his Java console for inspiring 
> me to make the effort to add the combined panadapter/waterfall display 
> to mine).
>
> Cheers!
>
> - Jeff, K6JCA
>
> Barry Jablonski wrote:
>   
>> Hi Jeff,
>>
>> I see that you made your console available via the svn.  Excellent!
>> Thanks for sharing.
>>
>> Barry
>> WB2ZXJ
>>
>> 
>
>
>
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Re: [Flexradio] RE :K6JCA latest console

[Jeff Anderson]

Thanks for the report, John.

Alas, the old, large, boatanchor-style s-meter is no more.  It became 
much to difficult to maintain my original code after Flex adopted some 
of my features (I'd get a tremendous numbers of "merge" errors when I 
tried to merge my code with their new code base), and so I decided that, 
if I was going to continue playing with the code, I'd start off with 
their new code base as my basis.  Because I never used the old meter 
(although very cool, it's scale was not linear, and therefore not 
accurate), I decided not to carry it over to the new code.

By the way - I just uploaded (minutes ago), a new .exe to the SVN 
branch.  There was a small bug in that the pan/waterfall combo choice 
would disappear from the display pull-down menu if you selected SPEC 
mode.  And while talking on the air with friends this morning, we 
discovered that, if playing back wave files over the air, we really 
should turn off the "TX EQ" button.  So I modified my front panel 
"Playback" feature to temporarily turn Off the TX EQ (if it's On), but 
only during Front-panel playback.  At the end of playback it's put back 
to its original (pre-playback) state.

- Jeff, K6JCA

John Sweeney wrote:
>I seldom make a post, but had to on this.  I just downloaded Jeff's
> latest console on his SVN branch and love it.   The combo Waterfall and Pan
> is fantastic for CW and digital modes use.   The other features are great
> too.   Gave me that "ohhh man, cool"  moment when I first used it.I also
> seem to recall that there was a conventional analog meter display option too
> but don't see it now , how does one bring up the analog meter display, if
> still there?
>
> Thank you Jeff !!
>
> 73,  John  N3WT
>
>
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Jeff Anderson
> Sent: Sunday, January 06, 2008 9:46 AM
> To: Barry Jablonski
> Cc: flexradio@flex-radio.biz
> Subject: Re: [Flexradio] John Melton Java GUI (Dec 29 update)
>
> Thanks, Barry.
>
> If you're interested, you can find more info about it on my blog:
> http://k6jca.blogspot.com/
>
> (And again, my thanks to John Melton and his Java console for inspiring
> me to make the effort to add the combined panadapter/waterfall display
> to mine).
>
> Cheers!
>
> - Jeff, K6JCA
>
> Barry Jablonski wrote:
>   
>> Hi Jeff,
>>
>> I see that you made your console available via the svn.  Excellent!
>> Thanks for sharing.
>>
>> Barry
>> WB2ZXJ
>>
>> 
>
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Re: [Flexradio] John Melton Java GUI (Dec 29 update)

[Jeff Anderson]

Thanks, Barry.

If you're interested, you can find more info about it on my blog:  
http://k6jca.blogspot.com/

(And again, my thanks to John Melton and his Java console for inspiring 
me to make the effort to add the combined panadapter/waterfall display 
to mine).

Cheers!

- Jeff, K6JCA

Barry Jablonski wrote:
> Hi Jeff,
>
> I see that you made your console available via the svn.  Excellent!
> Thanks for sharing.
>
> Barry
> WB2ZXJ
>

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Re: [Flexradio] John Melton Java GUI (Dec 29 update)

[Jeff Anderson]

John Melton's (G0ORX/N6LYT) very cool "combined Panadapter/Waterfall" 
display that he revealed yesterday on his blog inspired my to try the 
same thing on my SDR Console (using the SVN code).  Take a look at it here:

http://k6jca.blogspot.com/

- Jeff, K6JCA


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Re: [Flexradio] I'm not a programmer

[Jeff Anderson]

Very nice, John!

I especially like your combined Panadapter/Waterfall display.  Very 
cool!  I think I'll try adding this to my "slightly enhanced" SDR 
console - I don't think it'd be too difficult (I hope!).

- Jeff , K6JCA



John Melton wrote:
> To get an idea of the GUI for the SDR-1000 take a look at my new Blog at 
> http://javaguifordttsp.blogspot.com/
>
> Any similarities to PowerSDR are intentional ;-)
>
> I have put a couple of screen shots of it running on the Mac which 
> includes the Activity Monitor to get an idea of the memory utilization 
> and the CPU utilization.
>
> The version of DttSP (sdr-core) that it is running is the dttsp-ng 
> version pre the 48000 down sampling changes.
>
> John g0orx/n6lyt
>
>   

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Re: [Flexradio] Flex 5000 Front Panel Headphone Jack (Follow Up)

[Jeff Anderson]

What National chip is used?  I'd like to check out its datasheet.  And how
is it wired to the headphone jack?  It sounds as though the Flex design
connects the headphone shield to a pin on this IC, rather than to chassis
ground, correct?

Thanks!

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Jim, W4ATK
Sent: Friday, November 16, 2007 4:38 AM
To: Flex-Radio Reflector
Subject: Re: [Flexradio] Flex 5000 Front Panel Headphone Jack (Follow
Up)


Thanks to Bill Winkis for supplying the datasheet information on the 
audio
amp chip used in the Flex 5000. The mystery is, I believe, cleared up as to
why some headphones will work while others will not. The Sony headphones
have a DC resistance of 10 ohms or so, low DC resistance. The Heil ProSet
phones have a DC resistance of 206 ohms. Some will conclude this should not
be a problem, but it apparently is. The National chip used in the 5000 has
two modes of operation, Capacitor coupled and OCL capacitor less).  OCL mode
supplies a voltage to the sleeve (common) connection (notice the isolated
from ground headphone jack). The amplifier chip monitors the current through
this connection and if it exceeds 500 mA, will shut down. The current thru
the old 10ohm stereo phones is sufficient to drive them to DC block
producing a loud "pop" and may be sufficient to shut the amp down, while the
higher DC resistance of the Heil ProSet satisfies the requirement of the
device and work perfectly.
This may be covered in the specifications or somewhere but being 
anxious to
get the new baby on the air, all this senior citizen saw was TRS stereo
headphones and went for it. Anyway this is my story and I am sticking to it
until the guys at Flex tell me I am all wet.

73's Jim, W4ATK
[EMAIL PROTECTED]
http://web.mac.com/jimrogers_w4atk


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Re: [Flexradio] Flex 5000 Front Panel Headphone Jack (Follow Up)

[Jeff Anderson]

Hi Jim,

Thanks for the datasheet.  Per my reading of it, I think you may have hit
the nail on the head: if *both* headphone outputs are driven with the same
signal into, say, 8 ohm headphones, the 500mA peak current rating of the
"common" pin will be exceeded when the output voltages (if in phase) hit 2v
peak over (or under) the "bias" voltage from the common pin, and the amp
will shutdown.

My 5000A hasn't yet arrived, so I can't verify how the amp is wired &
powered.  If the amp is powered from 3.3V, though, I'd think that the
low-impedance headhones wouldn't be a problem, because the max peak voltage
(assuming no drop in the amp itself) that the amp could deliver would be
3.3/2, or 1.65 volts.  However, if the amp is powered by 5 volts, the max
peak voltage could be 2.5 volts.  (If interesed, you could probably easily
determine what the amp's power supply voltage is.  Just measure from the
headphone "sleeve" to chassis ground - this should be half the power
supply.)

Although the National datasheet doesn't specifically specify a minimum load
impedance (or if they did, I didn't see it), the fact that all of their
graphs show a minimum impedance of 16 ohms probably means that one ought not
go below that (at least not in OCL mode).

There would also be a problem if attaching mono headphones to the stereo
jack (or if one side of the headphones has a short making it a low
impedance - you may want to verify with an ohmmeter that both sides of your
headphones are OK).  This, too, should cause a shutdown of the amp.

- Jeff, K6JCA

(And it goes without saying...my analysis may be completely incorrect!)



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Re: [Flexradio] Multiple tones on cw transmit or tune

[Jeff Anderson]

One possiblity could be spurious tones caused by mixing with DDS spurs - if
you turn off Spur Reduction (the 'SR' button), do the extraneous tones
change frequency or disappear?  Do they change as xmit frequency changes?

Also, if you can listen to the line-out audio, do you hear multi-tones there
(but this may not be possible with the 5000A)?  If so, that would imply that
the spurious frequencies might be generated by software.

Another possiblity might be a ground-loop, and you're hearing 120 & 300 Hz
harmonics of 60 cycles.  But I don't know how you'd get ground-loops with
the 5000A (although it's certainly possible with the 1000).

Someone who's more familiar with the 5000A and/or the software might have a
better idea as to what's going on...

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Craig Sande
Sent: Saturday, November 10, 2007 2:59 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Multiple tones on cw transmit or tune


Yesterday I worked a local friend on 40-meters cw.  He was listening with
his K3 and said my signal had a musical quality to it and appeared wide on a
spectrum display.  Listening closer, he thought that there was a main tone
at 1500 and additional tones at 300 and 100 Hz (I'm not sure how he was
measuring this).

Today I transmitted into a dummy load on 20 meters while listening with a
Kenwood TS-850 and indeed there sounds like there is the main tone and at
least one additional low frequency tone (at much lower strength) being
transmitted. Since I don't have a panadapter display on the Kenwood, I can't
comment on the signal width.

I was using PowerSDR svn 1738.  I reverted back to the currently approved
version of PowerSDR v1.10.3 and found the same problem.  I am keying the
Flex-5000a via the jack on the back using a LogiKit CMOS-4 Keyer.  I am
using firmware version 0.1.1.3.

What could be causing this and how can I correct/diagnose the problem?

Thanks,

Craig, AE7I
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Re: [Flexradio] 11kHz DC noise

[Jeff Anderson]

Hi Rob,

If you are seeing aliased ghosts below the hump, you might want to check
that you've correctly nulled the image frequency - I don't have the same
ghosts you seem to have.  Some experimentation should help you identify what
the problem is - personally, I would certainly find "ignoring" the lower
part of the sprectrum below the hump much more objectionable than simply
having the small bump at 11 KHz.

Although I've never found the hump to be objectionable (note that it's not
just DC, but also low-frequency noise), if it's bothering you and your
friends you might want to try experimenting with ways to mitigate it - no
doubt you'd get tremendous praise from the list if you can find a reliable
way to reduce or eliminate it!

Best of luck!

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Rob Dennison
Sent: Sunday, October 21, 2007 4:19 PM
To: flexradio@flex-radio.biz
Subject: [Flexradio] 11kHz DC noise


Hi guys,

Have my SDR1k working well enough now to start tackling deeper problems.

One of the first is the 11kHz DC noise.  Quite a few of my friends have
been through the shack now.  They always ask about the 11kHz hump and are
always turned off by my Q10241 answer: "gotta live with it."  It is a
real problem in selling them on flexRadio.  They look on it as a design
defect.  So do I.

So having read and re-read Q10241 in the knowledge base I am still
dissatisfied.  Why do we have to live with it?  It is a design defect.

1.  Okay on audio transformers but why not optical isolation?  It seems
optical isolators would have much wider bandwidth.
2.  Also many of the peaks I see below the hump seem to be aliased.  This
is confusing enough that I've made it a rule not to look below the hump.
I don't want to waste air time clicking on ghosts.  Why not just start
the panadapter  spectrum display at the frequency corresponding to dc?
3.  If we have a good answer to 2, why not subtract (or otherwise
process) out the DC hump?  After all, we know what it is and where it is.
 Yeh, I know there might be a signal  big enuf to see somewhere in the
hump but tuning down band a bit will reveal it.
4.  Still solution 3 seems to be in the nature of a work around.   Why
not rethink our algorithm chain?   As flexRadio gets more successful I
can see the attack ads starting up.  Think about the next QST review...
Some competitor will solve the problem.

Looking forward to some good answers to a real detractor to the flexRadio
concept.

Rob
AB7CF

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Re: [Flexradio] New Bandplan effective Jan 2008

[Jeff Anderson]

The Flex's ability to receive, and to transmit, bandwidths greater than 2.7
KHz make it my favorite radio, by far.

Fortunately out here on the West Coast, bands such as 75 meters are not at
all congested.  If the bandwidth is available and you're not interfering
with anyone, what's the harm of running a SSB signal that's 4 to 5 KHz wide?
It sounds *great* on the Flex.  Give it a try.  Once you do you'll realize
that 2.4 KHz audio, by comparison, sounds terrible.

As for AM - some of those old boatanchors truly sound amazing and are a joy
to listen to.  And it's also a step back into history, envoking a different
era of ham radio.  Why run AM, you wonder?  Heck, you might as well ask,
"why run CW?"  Both are outdated (in my opinion), but both can also be great
fun.

Best regards from the Left Coast,

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ahti Aintila
Sent: Wednesday, October 17, 2007 1:36 AM
To: K6JEK
Cc: FlexRadio Reflector
Subject: Re: [Flexradio] New Bandplan effective Jan 2008


Jon,

Take it positively. Isn't it good that you have the excellent digital
filters in your Flex Radio? With the 2.4 kHz SSB filter you can pass
safely your 300 Hz to 2.7 kHz audio modulation to the ionosphere and
rest safe that you don't splatter around with your unnecessarily broad
transmission and disturb your fellow hams on the neighboring channels.

And by the way, I really wonder that some still, after more than 60
years of amateur SSB, want to use double sideband with full carrier
outside anywhere else than in Faraday cages of some Radio Museums.

Best regards from the RF-congested Europe,
Ahti OH2RZ


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Re: [Flexradio] snap click tune question & Click Tuneoffsetsquestion

[Jeff Anderson]

I agree with Tim - I don't believe you want click tuning to round the
frequency when in CW modes.  But rounding is a great feature for voice modes
where stations are often on integer KHz (or 500Hz) boundaries).

(In fact, this is how I modified my Console when I added a similar feature
to it).

- Jeff, K6JCA


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Tim Ellison
Sent: Sunday, September 30, 2007 2:56 PM
To: Ray Andrews, K9DUR
Cc: Flex-Radio E-Mail Reflector
Subject: Re: [Flexradio] snap click tune question & Click
Tuneoffsetsquestion


AH HA!   I was using USB mode to test.  I confirm your observation.

I believe this is working as designed.  For digital/CW modes, you want
to be exactly on the frequency when you click since tuning to the
nearest Tune Step frequency will probably be no where close to the
narrow digital/CW signal you really want to tune in.

This is probably more of an enhancement than a bug.  You want an option
to click tune all modes if the option is selected.


-Tim

-Original Message-
From: Ray Andrews, K9DUR [mailto:[EMAIL PROTECTED]
Sent: Sunday, September 30, 2007 5:43 PM
To: Tim Ellison
Cc: Flex-Radio E-Mail Reflector
Subject: RE: [Flexradio] snap click tune question & Click Tune
offsetsquestion

Tim,

Okay, I did a sanity check & started with a new database (even though t
already was).  Problem still there.  Further investigation reveals that
it is mode-dependent.  It works properly on LSB, USB, DSB, FMN, AM, SAM,
SPEC, & DRM.  It does NOT work on CWL, CWU, DIGL, & DIGU.  I will add an
update to my Bug tracker entry.

73, Ray, K9DUR




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Re: [Flexradio] Spike/Audio Pop on PTT Release

[Jeff Anderson]

I've noticed the same thing as Dan.  I hear it on my local speakers as I
transition from xmit to rcv.  It corresponds to a large transient at 0 Hz
(shifted by the IF frequency, so on the panadapter display the transient
spike is about 11 KHz away from my Rx frequency).  My guess is that some
receive buffer is probably zeroed out, resulting in a DC transient before
it's filled with valid audio data.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Tim Ellison
Sent: Monday, September 24, 2007 4:52 PM
To: Dan rooney; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Spike/Audio Pop on PTT Release


Dan do you actually hear it in the transmitted signal (RF) as opposed to
the AF monitor?


-Tim

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dan rooney
Sent: Monday, September 24, 2007 7:44 PM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Spike/Audio Pop on PTT Release

I've been trying to rid my system of this problem with no luck.
Running 1.10.2 with P4 3.2G WinXP, SDR-1000 and Delta 44.
I have all lines coming into the breakout box isolated. I have tried a
variety of dma/audio/dsp buffers setting to no avail. The spike on PTT
release is 9K down without SR and 12K with SR on. Version 1.8 did not
exhibit this behavior, but I think it was the slower T/R switching time
of 1.8 that helped mask the problem.
Any ideas? TIA

Dan KG0AQ

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Re: [Flexradio] Analog S meter

[Jeff Anderson]

I would like to add that there *is* an analog-type meter already available
in the Power SDR: you can replace the led-bar style meter with an analog
style edge-meter.  In my opinion it works nicely (although it could use a
"peak" needle).

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ken
Sent: Monday, September 10, 2007 4:00 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Analog S meter


Hello Ken,

I would love to see a similar meter in the Power SDR!

Ken
K3YI



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Re: [Flexradio] Analog S meter

[Jeff Anderson]

It was precisely that meter (designed by Beppe, IK3VIG) which inspired me,
and which, in turn, I added to my Console.

One problem with it, though, is that the meter's dB/uV scale, as drawn, is
not linear.  For example, if you look closely at it you'll notice that the
arc subtended from 0 to 10 is much larger than the arc subtended from 60 to
70.  Ideally, you'd like the subtended arcs to be equal.  So there's a bit
of error introduced (not compensated for in my meter code) as the needle
approaches either end of the scale.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ken N9VV
Sent: Monday, September 10, 2007 7:20 AM
To: [EMAIL PROTECTED]
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Analog S meter


check out this nifty S-Meter from Phil N8VB and John KD5NRA
 http://www.philcovington.com/SDR.html
scroll about half way down


Trevor Smithers wrote:
> Anyone interested in seeing an "analog" S meter included in the consul?
> I don't mean replace the existing meters but having a choice between
digital/analog similar to the one
> included in the WA6AHL/K6JCA version of the consul in April 06.


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Re: [Flexradio] Spurs on 20m

[Jeff Anderson]

Hi Ray,

I believe that those are spurs generated by the DDS chip.  They're most
prevalent at (or close to) frequencies in which the DDS oscillator can be
divided by an integer (e.g. 50 MHz (=200 MHz/4), 28.57 MHz (=200 MHz/7),
etc.  (Note that the "Spur reduction" math will shift these frequencies
slightly, and you may need to add (or subtract) the IF frequency (typically
about 11 KHz), to the final frequency, too.)

You should also see them (in reduced amplitude) around 7.15 MHz, etc.

Because they're from the DDS chip, I don't believe the choice of soundcard
will have much effect on them.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ray J
Sent: Saturday, September 01, 2007 3:02 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Spurs on 20m


I have noticed this with the sdr1000 since I received it, july06 it is
like a strange "mixing" or something like that..
I figured it was normal...I have run across it on different bands

some screen captures of lower end of 6 meters.

http://www.w9ray.org/sdr/spurs.htm

I noticed this with both Delta 44 and the Janus/Ozy combo

Ray J
w9ray



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Re: [Flexradio] Rolling wave ver 1.10.1

[Jeff Anderson]

I'd agree that it's probably not an ionosound signal.  Typically, ionosound
systems (such as BR Communications "Chirpsounders") scan at 100 KHz per
second, so those types of signals will seem to fly across your panadapter
display.  10-20 seconds to cross the screen seems *much* too slow, and I'd
lean towards Bob's explanation (or interference from other outside sources).

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Tom Homsley
Sent: Monday, August 27, 2007 9:03 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED];
flexradio@flex-radio.biz
Subject: Re: [Flexradio] Rolling wave ver 1.10.1


Bob (N4HY) thinks otherwise -
***
Tom:

The most aggravating feature of the SDR-1000 after the ECO's are all in is
the untamed oscillator and leakage of the 15V switching power supply.  This
is what you are seeing.

Bob
***

Tom, N4WBS


>From: "Gerald Youngblood" <[EMAIL PROTECTED]>
>To: "'Jim Lux'" <[EMAIL PROTECTED]>,"'Jim McLester'"
><[EMAIL PROTECTED]>,"'Tom Homsley'"
><[EMAIL PROTECTED]>,
>Subject: RE: [Flexradio] Rolling wave ver 1.10.1
>Date: Sun, 26 Aug 2007 19:50:51 -0500
>
>This is clearly ionosound.  I see it frequently and the signal always
>sweeps
>from left to right (low to high frequency) in a single pass.  It is used to
>test propagation conditions.  It is a real signal and not the radio or
>version of the software.
>Gerald
>
>Gerald Youngblood, K5SDR
>FlexRadio Systems
>Ph: 512-535-4713
>Fax: 512-233-5143
>Email: [EMAIL PROTECTED]
>Web: www.flex-radio.com
>
>
> > -Original Message-
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of Jim Lux
> > Sent: Sunday, August 26, 2007 7:38 PM
> > To: Jim McLester; Tom Homsley; flexradio@flex-radio.biz
> > Subject: Re: [Flexradio] Rolling wave ver 1.10.1
> >
> > At 11:20 AM 8/26/2007, Jim McLester wrote:
> > >I have been seeing something like that, like a weak spur comes from
> > >nowhere and goes to nowhere.  It seems to move left to
> > right, the one I
> > >see.  Takes 10 - 20 seconds, maybe more maybe less, to cross the
> > >screen. I thought it was something in the house.  I have a
> > goodly batch
> > >of signal troublemakers at this QTH!.
> > >
> > >Jim - W4YXU
> >
> > Could it be an ionosonde?  Does it occur at regular intervals
> > (like every hour at 6 minutes past the hour)..
> >
> > Jim, W6RMK
> >
> >
> >
> > ___
> > FlexRadio mailing list
> > FlexRadio@flex-radio.biz
> > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
> > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/
> > FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio
> > Homepage: http://www.flex-radio.com/
> >
> >
>

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Re: [Flexradio] Noise Floor S meter vs Panadapter

[Jeff Anderson]

Isn't the s-meter noise the integration of all of the noise in the filter
passband (or something like that)?  In other words, as you narrow your
filter, I'd expect you to see the s-meter reading approach the panadapter
reading.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Philip J Gentile
Sent: Thursday, June 14, 2007 7:54 AM
To: Doug McCormack; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Noise Floor S meter vs Panadapter


i would terminate the antenna connection into a 50 ohm load to measure
noise.

phil AB2JL

- Original Message -
From: "Doug McCormack" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, June 14, 2007 11:29 AM
Subject: [Flexradio] Noise Floor S meter vs Panadapter


>I recently build the Elecraft kit to provide a reference signal for
> calibration of my SDR1000.  With the 50 uV reference my S meter shows
> -73 dBm (S 9.0).  At 1 uV reference, the meter shows -107 dBm ( S
> 3.3).  These two numbers show the S meter is perfectly calibrated.
>
> When I remove the Elecraft unit and no antenna is connected, the meter
> shows a noise floor of  -117 dBm (S1.3).  But the panadapter shows
> -145 dB.  I wonder why the panadapter does not agree with the S meter.
> Maybe I am should ground the antenna connector when measuring noise
> floor?  When people ask me about the noise floor, do I say -117 or
> -145?
>
> I have always suspected my 5 year-old Dell 1.8 Ghz has high internal
> noise possibly on the PCI bus.  Perhaps this Dell system noise is
> getting into my M44 sound card.  I hope to have a new dual-core Intel
> computer later this week.
>
> 73, Doug VE3EFC
> -- next part --
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Re: [Flexradio] Visual Studio

[Jeff Anderson]

When I decided to try Flex programming I picked up a copy of "Microsoft
Visual Studio .Net Professional 2003" on ebay.  I don't know about the other
versions, but this one works fine for me.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Mark Amos
Sent: Wednesday, June 06, 2007 3:00 PM
To: 'Tim Ellison'; [EMAIL PROTECTED]; 'flexradio'
Subject: Re: [Flexradio] Visual Studio


Tim,

Thanks for the link.  Can you (or someone else on the list) straighten out a
couple of things for me?  In the KB article, "Visual Studio .NET 2003" is
listed as the core software.

When I look on Ebay (assuming that a retail version will cost some sizeable
fraction (or multiple?) of a kilodollar) I find, in no particular order:
Microsoft Visual Studio .NET 2003
Microsoft Visual Studio .Net Academic 2003
Microsoft Visual Studio .NET Pro 2003
Microsoft Visual Studio .NET 2003 Enterprise Developer
Microsoft Visual Studio .NET Professional 2003 [probably same as .NET Pro
above]

Which ones of these are likely to actually be able to compile and link the
PowerSDR source into working code?  (Or do you also need a separate C
compiler, C#, C+, C++, C- or other additional [EMAIL PROTECTED] compilers to 
actually
do the job?)

The KB article is a bit obtuse (or I just haven't had enough coffee...)
Confusing sentences / fragments  like, " If you prefer to tinker with the
code without having to shell out the big bucks for MS software are using
SharpDevelop..." and other non-sequiturs make me think that either the
editor swallowed some text or the post was damaged in transit.

I'm hoping you (or someone else on the list) can provide a few more details
on what it actually takes.

Mark





-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tim Ellison
Sent: Wednesday, June 06, 2007 9:37 AM
To: [EMAIL PROTECTED]; flexradio
Subject: Re: [Flexradio] Visual Studio

The info you are requesting is in the Knowledge Base

http://kb.flex-radio.com/article.aspx?id=10062&cNode=2U5T5S


-Tim


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve Pink
Sent: Wednesday, June 06, 2007 9:26 AM
To: flexradio
Subject: [Flexradio] Visual Studio

What version of Visual Studio should I have to be able
to compile and modify the source code for PowerSDR?
Can I use Visual Studio 2005?

Thanks,

Steve, KF1Y




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Re: [Flexradio] Microphone for FLEX-5000

[Jeff Anderson]

For what it's worth, I use a Heil PR-40 with my SDR-1000 (with Delta 44
soundcard).  The mic connects directly to the SDR mic input (no external
preamp needed), and I set the console's Mic Gain to 50, plus I add some mid
and high frequency boost with the equalizer.  That's all there is to it for
the PR-40, and I get excellent audio reviews.

73,

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ray Andrews
Sent: Wednesday, May 30, 2007 12:21 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Microphone for FLEX-5000


Alan,

I am using a Heil ProSet Plus with my SDR-1000.  The Yaesu adapter cable
from Heil almost works with no modifications.  The SDR keeps the Mic ground
& the PTT ground separate but the Heil adapter cable that I have only
connects one of the 2 grounds.  I jumper the 2 grounds together in the audio
interface box I use and all is well.  The Flex 5000 is supposed to be fully
compatible with the Heil Yaesu adapter cables, so this should no longer be a
problem.

I am using the M-Audio Delta 44 sound card & it really needs a pre-amp to
work with the Heil headset.  However, I understand that this not a problem
with the integrated "sound card" in the 5000.

With the ProSet Plus, I can switch between either the HX-4 element (DX) or
the HX-5 element (full range).  I am a DX'er & don't worry much about
broadcast-quality audio (just let it be clean & punch through the pile-up),
so I normally leave the switch set to the DX position.

Good luck.

73, Ray, K9DUR



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Re: [Flexradio] Radio with a computer in it vs. a computer with aradio in it

[Jeff Anderson]

We shouldn't forget that the flex *does* have an image (at 22 KHz), and that
there can be image rejection issues if the signal at the image frequency is
strong.  I've seen images from strong stations on the Flex panadapter
display (and might have even heard one, a long time ago).  In a contest
environment, with strong stations nearby, this problem could be exacerbated.

Nulling the software image-rejection helps at the frequency you're listening
to, but image rejection worsens (on the spectrum display) as you shift the
frequency of the image signal.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Duane - N9DG
Sent: Friday, April 13, 2007 6:17 AM
To: Tim Ellison; Ray Andrews; [EMAIL PROTECTED]
Subject: Re: [Flexradio] Radio with a computer in it vs. a computer with
aradio in it


--- Tim Ellison <[EMAIL PROTECTED]> wrote:

> I totally agree.  The SDR is a different beast and you can
> not use well
> established "old world" standards to compare it by.  This,
> along with
> delineation of the difference between a radio with a
> computer "in it"
> rather than a computer "doing it" is also a big educational
> process that has to be pushed forward.

This fundamental conceptual difference is indeed lost by many
out there in ham radio land. Those who try to frame Flex
radio's competition as being in the same league as the Flex
is in terms of computer integration simply haven't grasp this
key differential concept.

The Flex models are in a league all of their own for factory
ready transceivers. The traditional "big 4" models are all
still just traditional radios with computers in them.

Duane
N9DG


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Re: [Flexradio] FW: Software Progress

[Jeff Anderson]

Hi Lee,

I'm not sure I'm following the discussion corectly, but, in my opinion,
full-duplex doesn't necessarily mean zero latency.  For example, on the
receive side of the SDR1K, there's a delay determined by whatever buffers
there are (audio buffers, dsp buffers, etc...) and their length.  A buffer
having a length of 4096 samples, for example, will introduce a delay of
about 85 msec (at a 48KHz sampling rate), irrespective of whether the system
is full-duplex or half-duplex.  In other words, there's a long "pipe" data
needs to first get through before it pops out as audio and can be
reacted-to.  So if you are the operator at the far end, even if the SDR1K
T/R delay at the near-end is 0 msec and the TX buffers were only 1 sample
long (very unlikely), I believe you'd still see (in this example), at a
minimum, a latency of 85 msec.

73,

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Lee A Crocker
Sent: Saturday, March 31, 2007 7:46 AM
To: Jerry Flanders; Flexradio
Subject: Re: [Flexradio] FW: Software Progress


Then you need to listen again.  The software architecture has been changed
from a half duplex model to a full duplex model.  A fast relay does do
something since the spec for Pactor as I understand it is 20ms for lockup
but it may be longer.  The SDR-1000 is still a half duplex radio, but the
point is that the latency is now hardware limited (as in TR) in the radio
and no longer software/soundcard limited like it was a month ago.  In full
duplex mode there is basically no latency because both transmit and recieve
chains are 100% active all the time.  If you had a way to get RX and TX IQ
streams independently to and from the sound card using PowerSDR to the
correct transmitting and receiving hardware you would have a continuous
signal path and no latency just like a telephone.  The utility of such an
architecture not only shines in such modes as Pactor and QSK CW, but
consider satellite modes where you have cross band up and down link.  The
entire nature of what is possible
 is changed when you go to a full duplex model.

73  W9OY

- Original Message 
From: Jerry Flanders <[EMAIL PROTECTED]>
To: Lee A Crocker <[EMAIL PROTECTED]>
Cc: FlexRadio@flex-radio.biz
Sent: Saturday, March 31, 2007 11:12:54 AM
Subject: Re: [Flexradio] FW: Software Progress

A fast relay does nothing to reduce the time required for the
received signal decoding - the delay of many ms that occurs before a
received signal appears at the sound card audio output. IIRC, PACTOR
requires a TOTAL turn-around time of around 30-35 ms. If you compare
audio from a SDR-1000 simultaneously with a conventional receiver
tuned to the same freq you will notice this delay. Last time I
listened, it sounded like at least a hundred ms.

CW QSK should be possible because there is no precise handshaking in that
mode.

Jerry W4UK

At 09:10 AM 3/31/2007, you wrote:
>One of the goals was to see if the SDR-1000 could be made pactor
>ready under software.  It looks like a modification would be
>necessary to meet that goal.
>
>Here are some relays that would fill the bill if someone wanted to
>mod their SDR for QSK
>
>RFK-6396 high speed SPDT RF switching relay with SPDT auxiliary contact
set.
>
>http://www.mgs4u.com/RF-Microwave/RFrelays_misc.htm
>
>These are very small. They are not plug in replacable and they are
>26v so some form of power would have to be incorporated, but they
>can easily handle the RF duties.
>
>The switching time is less than 4ms.  The rise time of a dit is
>5ms  I believe the rest of the relays in the SDR-1000 would be
>adequate.  I'm not sure but since this relay has 2 sets of spdt
>contacts you may be able to get away with only 1 relay
>
>I bought some of these and they are of the highest quality.  Until
>the advent of full duplex it wasn't really in the cards for the
>SDR-1000 to become a QSK radio but now I think its worth the
>experiment.  I looked at the cleaver design in the K-2 using a PIN
>diode switching arrangement.  They use a voltage tripler using an
>oscilating MAX RS232 chip to provide the primary voltage  for the
>doubling.  The parts count is high and making that work would be a
>lot of goofing around to get the same effect as you would out of a 6
>buck relay.
>
>This device may fit the bill for getting the 26V, but I havent tried that
yet.
>
>http://www.allelectronics.com/cgi-bin/item/DC-32/200/DC-DC_CONVERTER_.html
>
>73  W9OY
>
>
>
>
>
>
>
>
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>FlexRadio Know

Re: [Flexradio] Continuing transmit strangeness in new setup

[Jeff Anderson]

Hi Paul,

Something might have shooken loose in shipment.  There's a 2-pin female
connector (which only has one wire going to it) that can fall off in
shipment (happened to a friend of mine), and, if I recall correctly, he had
the same symptoms.

I'd recommend that you remove the top cover and look for loose wires or
connectors.  The 2-pin connector I'm thinking of usually has a single white
wire attached to it, and it should be mounted on the SDR boards next to (and
immediately to the right of) the large multi-pin connector which connects
the SDR board stack to the PA.  Make sure this connector is properly seated.

Good luck!

- Jeff, K6JCA


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Paul Beckmann-wa0rse
Sent: Friday, March 30, 2007 6:30 AM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Continuing transmit strangeness in new setup

I came home tonight and worked some more on this problem.

I hooked up a Lucas Weinschel DC-8GHz dummy load (50W, checked good at
50.1 ohms) up to the HF PA BNC with a single male-male BNC and a
female BNC-female N adapters, no coax, both adapters had been used
before with success on other projects.

Attempted to run the calibration routine on the PA.

On 160 meters, it keyed down, then up, then increased the value in
the 160 box, then repeated until it got to 98 something. It then
stalled and I aborted and reset the values to those on the pink sheet
supplied with the unit.

I added ferrite cores to the parallel port cable on both ends to help
rule out RFI possibilities.

I checked the voltage on power down and it held steady around  12.76
from a no-load of 12.83V. I looked at the forward and reverse power on
the multimeter during tune and, even though tune power was set to 10W
in the setup form, I get 579 W in the meter.

Something is definitely wrong.

Could something have loosened up in shipment? I hate to have to ship this
back.

73
--Paul, wa0rse

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Re: [Flexradio] Goundloop problem or what?

[Jeff Anderson]

Hi Larry,

Your observation that the spikes occur on CW but not USB implies that they
are related to frequency (the CW frequency is actually shifted by the "CW
pitch" amount).  Try setting CW pitch setting to 0 Hz; I'd expect the spikes
now to be the same in CW and USB modes.

As you tune the receiver, how do the spike frequencies, and the distribution
of spikes, change?  I'm wondering if they're related to DDS spurs: perhaps
they are actually DDS spurs, or they might be some sort of mixing product
(perhaps mixing with DDS spurs).

How far down are the spikes?  The DDS spurs will be especially obvious when
you don't have an antenna attached.  With a good antenna attached (and
normal atmospheric noise), I find that my DDS spurs are usually below the
noise (but not always).

But DDS spurs may not be the issue.  If you unplug all of your audio cables
from the Delta 44 box, do the spikes disappear?  If you then attach any
*single* cable, do they reappear?  Or do they reappear if only certain
cables are attached?

Depending upon the answers to the above questions (and perhaps to
yet-to-be-asked questions), there's a good chance that ground-loops might be
the problem.  If so, I would recommend purchasing some "ground-loop
isolators" (Radio Shack sells them) and isolating all audio lines between
your SDR and your PC.

Good luck!

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Larry Groom
Sent: Monday, March 26, 2007 5:36 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] Goundloop problem or what?


Thanks to all those who replied to my earlier email about the apparent

groundloops I'm experiencing since I switched to a different computer.

On the Panadapter I see the 11 khz DC peak and then on either side

of the 11 khz peak there are peaks or spikes that diminish in strength

the farther you get from the main peak. These spikes are every 1 Khz.

I didn't add in my first note for help  that the spikes are there when

I have selected the CW mode but not there when I have selected USB

mode on 20 meters. Which makes me wonder if I'm having a ground

loop problem or not. I did disconnect each of the audio connectors into

the Delta 44 breakout box but the spikes remained. When I disconnected the

thick black cable from the breakout box to the computer the spikes did

disappear so, not sure what that means.  Looking for any and all help!

Thanks in advance for the help folks, I enjoy the help and

enthusiasm for this radio..



Larry W0FLY

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Re: [Flexradio] FA-66 Frequency Shift

[Jeff Anderson]

Yes, I've repowered it, and rebooted.  No change.

By the way - the shift is such that, if there are
harmonics of a signal present, they still maintain
their harmonic relationship (so it isn't simply a
shift of 25 Hz on all frequencies).  In other words, 1
KHz becomes 975 Hz, 2 KHz becomes 1950 Hz, etc.  It's
exactly as if the playback was a bit slower than it
should be.

If I instead playback through the laptop's headset
jack, I get the correct 1 KHz.

(The test signals were recorded for some analysis I
was doing of a simple recorder that records audio as
.wma files, and plays them back via USB.)

I suspect the FA-66 has the shift on both input and
output, so it's probably calibrated out when used in
the sdr application.

- Jeff, K6JCA
--- Eric Wachsmann <[EMAIL PROTECTED]> wrote:

> No such deal here.  If it is only on the output,
> PowerSDR wouldn't have a
> way of calibrating that out.  Have you tried
> rebooting and powering the
> FA-66 off and back on?
> 
> 
> Eric Wachsmann
> FlexRadio Systems
> 
> > -Original Message-
> > From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> > radio.biz] On Behalf Of Jeff Anderson
> > Sent: Sunday, March 18, 2007 12:10 PM
> > To: Reflector Flex-Radio
> > Subject: [Flexradio] FA-66 Frequency Shift
> >
> > Has anyone else noticed this shift (it's probably
> calibrated out by the
> > SDR
> > calibration procedure)?
> > 
> > Thanks,
> > 
> > - Jeff, K6JCA
> 
> 


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[Flexradio] FA-66 Frequency Shift

[Jeff Anderson]

Has anyone noticed a frequency shift on the Audio Out when using the Edirol
box for applications other than the Flex?

I first noticed this while listening to the Edirol box while connecting up
another device to the USB port.  The "connect" bongs that Windows generates
sounded a bit lower in pitch than I was used to.  Yesterday I was doing some
other work with the Edirol box, and noticed that a 1 KHz signal (recorded on
a seperate, USB device) was measuring 975 Hz when played back through the
Edirol.  In other words, there was a shift of -25 Hz.  I verified this by
measuring the frequency of the same signal when it was played back through
my laptop's headphone jack.  It was exactly 1 KHz.

Has anyone else noticed this shift (it's probably calibrated out by the SDR
calibration procedure)?

Thanks,

- Jeff, K6JCA


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Re: [Flexradio] Problems installing 100watt PA - help needed

[Jeff Anderson]

Hi Paul,

If your radio is like mine, the other end of the white wire (with should
have a connector on it) should plug into the two contacts that are right
next to (and in line with) the long row of contacts that are for the PA
Control cable.  When I installed a PA in my second SDR, the kit didn't
include the white wire, and I had to make one (and add scrounge up a 2-pin
connector from my junkbox, although only one pin is used - the white wire
will connect to the pin (of the 2-pin connector) which is closest to the PA
control connector (the long connector)).

If the diode smoked, it might have been installed backwards.  That is, the
diode should only conduct if your 13.8 volt supply has its polarity reversed
(it's there for protection).  The diode's Anode should attach to ground (the
terminals on your terminal strip to which black wires attach), and the
Cathode (the end with the stripe on it) should attach to the switched 13.8
supply.

My kit also didn't include diode, picofuse, or cap.  I suppose these
components are now not needed, but, as you noticed, the instructions (which
I downloaded from the website) don't state this.  Instead, their
installation is part of the instructions.  I happened to have a 2A fuse in
my junkbox, so I used it.

In your email below, are you saying that you have both 13.8 and GND attached
to the same terminal (A5) on your terminal strip?  If so, they should not
be.

Anyway, as you noticed, the parts kit conflicts with the instructions, and I
could not find anywhere a wiring diagram for the chassis.  Fortunately, I
have another SDR (factory wired) on which I was able to trace out the
connections on it, which helped immensely.

I'm not in my shack at the moment (where the radios are), but, from memory,
the connections roughly go like this (hopefully I have it correct):

o  Power comes from the banana jacks on the back panel of the chassis and
connect, via the heavy-gauge wires, directly to the PA.
o  From the PA, low-current power (both +13.8 and gnd) are taken to the
terminal strip with small-gauge red and black wires (part of your kit).
o  This low-current (unswitched) +13.8 volts attaches, via the terminal
strip, to one side of the front panel switch.
o  The other side of the front panel switch (let's call this the "switched
13.8 volts" side), returns to the terminal strip and attaches to the
picofuse.
o  The other side of the picofuse ( let's call this "switched and fused 13.8
volts") attaches to a bunch of things via the terminal strip:
 o  The front panel switch's LED (there might be a resistor in series
for this, too.  I've don't recall at the moment.)
 o  The fan (red wire).
 o  Your board stack (using the red wire, if  you've just installed it,
to the PIO board).
 o  Cathode of diode.
o  The narrow-gauge black wire from the PA which also attaches to the
terminal strip (gnd) will attach to the following things:
 o  The other side of the panel-switch's LED.
 o  The fan (black wire).
 o  Your board stack (using the black wire, if you've added it, to the
PIO board).
 o  The Anode of the diode.

I think that's it.  Hopefully someone else will look this over and check if
I've made any mistakes.

I wouldn't worry about the lack of the cap.  But you'll need to do something
about the missing picofuse.  For example, you could replace it with a piece
of wire (I guess it's no longer required).  And I would strongly recommend
verifying with a voltmeter that, at the terminal strip, you have the correct
polarity on the 13.8 volts *before* you attach the red and black wires that
attach to your board stack.  You don't want to smoke that.

Good luck!

73,

- Jeff, K6JCA



-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Paul Giusti
Sent: Sunday, March 11, 2007 6:34 PM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Problems installing 100watt PA - help needed


Hi All



I have the following boards installed in my SDR1000

BPF – 3.2 – 0434-033

RFE – v1.4 – 0429-050

TRX 3.2 – 0434-033

PIO 2.1 – 0434-033



It has the 4 pin mic socket on the front panel



The inside enclosure from back panel to front panel measure 7.5 “



I followed the installation instructions dated 1/8/2006. The fan is mounted
externally and is connected to B4 & B5 on the terminal strip. I have
installed the PA (v1.3) and connected 13.8 +ve to A5 and PA gnd to A5. Also
connected to the terminal strip on A3 & A6 was a 1A4007. I have removed D7,
D9 & R10 of the PIO board and soldered the white wire as per instructions..



where does the other end go



The 1A4007 smoked up after applying 13.8v to the SDR 1000 why???



My PA kit didn’t include the 2 amp pico fuse..is it required???

My PA kit didn’t include the .01 disc cap to put across the 13.8v terminal
at binding posts..is it required???



I short I am lost..as per instructions my unit doesn’t appear to follow any
of the installation examples and at the moment not sure w

[Flexradio] Solar power Inverter EMI

[Jeff Anderson]

Do any hams on the list used their Flex (or any other radio, for that
matter) on a system with Solar power?  I'm thinking of adding solar power to
my shack (which was, in a previous life, a detached garage), and another
Flex owner is considering the same thing,  but we are both worried about
potential EMI from the inverter (which converts the solar panels' DC to AC)
wiping out the ham bands. 

Any experience or suggestions out there?  One of the inverters is
manufactured by a German company (Fronius), but we've been unable to find
any information regarding its emi.

Thanks!

- Jeff, K6JCA
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Re: [Flexradio] open wire

[Jeff Anderson]

This is something I've wondered about (having heard it before).  But even
with a high SWR, why would an open-wire feedline radiate, if it's balanced?

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Jim Rogers
Sent: Wednesday, March 07, 2007 8:19 AM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] open wire


Tom and Stan,
Theoretically you are both, indeed correct. Unfortunately those ideal
conditions rarely exist. Most using open wire do it to achieve
multi-band coverage. In these situations it is not unusual to see very
high SWR on the feeders resolved at the transmitter by a good tuner. In
this situation, I could be wrong but, I believe you will find the
feedline will indeed radiate.

73 Jim, W4ATK


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Re: [Flexradio] Receive Attenuation Glitch

[Jeff Anderson]

Hi Larry,

I've seen this too.  I'd always assumed it was something in my external
auto-antenna tuner that was making a poor contact and that, because I was
passing current through the connection when I transmitted, that made it
became better. It's possible too, though, that it might be something in the
SDR radio, such as a relay making a poor contact.  (In my case, I don't
believe it's a software glitch.)

Next time it happens I'll try to remember to turn on another receiver and
check if it's also attenuated through my tuner.  If not, then that would
point to the SDR (or my antenna switch), rather than the tuner.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Larry Loen
Sent: Sunday, March 04, 2007 3:21 AM
To: FlexRadio reflector
Subject: Re: [Flexradio] Receive Attenuation Glitch


With at least the 1.8.0 level, there's a little glitch I've noticed that
might also be related to another recent thread.

Sometimes, when I've just turned the rig on, I find the receive is
attenuated an extra 20 dB or so somehow.  It actually looks, visually,
like a good deal, because the noise floor is down 20db.

To clear it, all I have to do is transmit, however briefly.  The noise
floor comes right back up to normal after that.



Larry  WO0Z



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Re: [Flexradio] Preamp issue - Results

[Jeff Anderson]

Hi Dana,

Are you saying that, with the same signal input (from
a test generator, for example), your radio, after
calibration, shows roughly a 10 dB difference in its
s-meter reading compared to the other radio?

My experience with several Flex radios is that, if
they're both calibrated with the same signal source,
they'll both have the same s-meter reading
(irrespective of whether the preamp IC is the new one
or the old one).

For example, if I calibrate with a -50 dBm source, the
final result will be an s-meter that reads -50 dBm
when I drive my radio with that source, and it does
not depend upon the preamp IC that's been installed.

If both your radio and Joe's radio were calibrated
using the same signal source (your XG1, for example)
then I'd expect you both to have the exact same
reading for it (and for any other signals, too).  The
fact that you don't implies that the calibration of
one of the radios might be incorrect.

Of course, there might be other issues, too. 

- Jeff, K6JCA


--- N1OFZ <[EMAIL PROTECTED]> wrote:

> Hi all,
> 
> I spent some time last night pouring over the ECO's
> and determining  
> which ones were done to my radio.  I did end up
> taking off the BPF  
> board to get a better look at the RFE.  Also during
> this process I  
> reviewed the block diagrams that Peter sent
> (thanks!).
> 
> Today with the help of Joe (AB1DO) I was able to
> test my radio  
> against his radio.  When we hooked up the XG1 my
> radio was showing  
> the XG1's signal at about S3.  It was also quite a
> bit off frequency  
> and suffered from some serious image issues.  After
> a few runs at  
> calibrating it and tweaking it back on frequency we
> ran it against  
> Joe's SDR.  The result were that the calibrating
> (with a good signal  
> source) seems to help significantly.  My radio still
> seems to be  
> about 10 dBm down from his but I believe it to be
> because his radio  
> has the newer preamp (ECO025).  We listened to a
> signal that was  
> showing around -90 dBm on my radio vs. his which was
> showing about  
> -80 dBm.
> 
> I guess the lesson learned is that if you own a
> SDR-1000 you best get  
> a XG1 or similar signal source.  Maybe future Flex
> Radio models can  
> incorporate a similar circuit?  Unfortunately, I had
> to go back to  
> work but I'm looking forward to getting it hooked
> back up in the  
> shack tonight.
> 
> Thank everyone who responded with suggestions and
> comments.  And a  
> big thanks to Joe for making time today to help me
> sort out the  
> problems.  It's great to have a local fellow Flexer!
> 
> '73
> Dana  N1OFZ
> 
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Re: [Flexradio] Full-duplex SDR, New Console

[Jeff Anderson]

One nice feature about John's console are what appear
to be UP and DOWN tuning buttons - I've noticed a need
for something like this when controlling my SDR from a
laptop's mousepad.  Without a mouse-wheel (which many
laptops don't have), I cannot easily get the frequency
to be what I want.

- Jeff, K6JCA

--- Frank Brickle <[EMAIL PROTECTED]> wrote:

> I take the liberty of cross-posting an excerpt of a
> message from
> John g0orx/n6lyt on the dttsp-linux discussion
> board.
> 
> > I have just built the dttsp-ng branch and have
> modified a prototype
> > version of gbeppe that supports the Softrock RXTX
> to work with it.
> > 
> > I am currently running two copies of sdr-core, one
> for RX and one for TX
> > and all looks to be working well.
> > 
> > I took a screen dump with System Monitor running
> showing the CPU usage
> > for the main processes:
> > 
> >
>

> > 
> > System is an AMD Sempron 3000+ with only 512K
> memory and a Delta-44.
> 
> 73
> Frank
> AB2KT
> 
> 
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Re: [Flexradio] PowerSDR "filter" bandwidth

[Jeff Anderson]

Unlike many other radios, if you're using the Flex S-Meter to check
bandwidth, then I don't think you need to turn the AGC off.  If I recall
correctly, the S-Meter samples the data prior to the AGC (otherwise, you'd
see the meter's response change with different AGC time constants, and I
don't think it does that).

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Guy Olinger, K2AV
Sent: Wednesday, February 14, 2007 4:53 PM
To: Larry W8ER; [EMAIL PROTECTED]
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] PowerSDR "filter" bandwidth


If you didn't forget to turn your agc OFF

The big unknown here would be the signal from your signal source.  A
lot of signal sources to calibrate frequency and level are also not
narrow if you start looking down below. Having phasing, 120 Hz
artifacts (particularly if you powered a signal source from a wall
wart), or any other kind of noise down 30 db from the main signal is
satisfactory for many uses, but not for what you are doing, which
requires a PRISTINE signal source.

Isn't there a way to look at a signal source with the SDR to verify
how clean a calibration signal is?

73, Guy.

- Original Message -
From: "Larry W8ER" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: 
Sent: Wednesday, February 14, 2007 7:22 PM
Subject: Re: [Flexradio] PowerSDR "filter" bandwidth


> Mark,
>
> I would assume that you also turned off your AGC. I am surprised at
> your
> figures. From what I hear, I would expect the filters to be much
> sharper
> than that.
>
> --Larry W8ER
>
>
> Mark Amos wrote:
>> Flexers,
>>
>> Has anyone done any actual measurements on filter bandwidth in
>> PowerSDR - I've been having an on-going discussion with a friend of
>> mine on filter sharpness, etc. - basically bragging about how tight
>> the software filters are.
>>
>> However, when I use a signal generator and measure the filter width
>> using the flex RX meter to measure the signals, I get much wider
>> filters than what the filter buttons say. For instance, the filter
>> bandwidths I measured come outlike this:
>>
>>  10Hz filter: 58 Hz at -3dB
>>  20Hz filter: 82 Hz at -3dB
>>  50Hz filter: 90 Hz at -3dB
>> 100Hz filter: 100 Hz at -3dB
>>
>>  10Hz filter: 260 Hz at -30dB
>>  20Hz filter: 260 Hz at -30dB
>>  50Hz filter: 280 Hz at -30dB
>> 100Hz filter: 300 Hz at -30dB
>>
>> I did these tests at 1MHz and 10MHz and got substantially similar
>> results. The 1MHz amplitude measurements ranged from roughly -40dB
>> to -90dB and the amplitudes measured at 10MHz ranged between -25dB
>> to -70dB but the shape of the curves looked about the same.
>>
>> I used a PalStar ZM-30 as a frequency generator stepping 10Hz with
>> each step (the FlexRadio corroborated the step size and the actual
>> frequency within a couple of Hz.)
>> I'm embarassed to say this is the first time I've actually measured
>> filter bandwidth So, I assume I'm just doing something wrong
>> and that's why the filters shapes look so fat...
>>
>> Anybody else got any empirical measurements to refute these
>> obviously flawed measurements? (Or thoughts on what I'm doing
>> wrong?)
>>
>> My qualitative assessment of the filters is that a 20Hz filter
>> "sounds" about like the 100Hz filter - so maybe it's something in
>> the way I've configured the software. Any thought?
>>
>> Mark
>>
>>
>>
>>
>>
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FlexRa

[Flexradio] What laptop do you use?

[Jeff Anderson]

OK - I may have blown up my laptop's motherboard
(don't ask me how, just let me say, "dumb dumb
dumb!").  So it looks like I'll be buying another
laptop.

Before I spend the bucks (preferably on a used one),
I'd like to find out what others use and how well it
performs running the SDR application.  So...if you're
using a laptop to run your SDR, could you please tell
me:

1.  Make & Model of laptop
2.  Speed of processor and, if known, type.
3.  Amount of RAM
4.  When running the SDR, approximate CPU usage.
5.  Opinion of laptop (good, bad...)

Also - if you're running firewire, is it integrated
into the computer, or are you using an adapter?  If an
adapter, what kind?

I'm using the Edirol FA-66, and I'd like to run it at
192Ksps.

Many thanks!

- Jeff, K6JCA

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Re: [Flexradio] show TX filter

[Jeff Anderson]

I haven't looked at the latest releases, Al, but not
too long ago it was on the front panel (rather than
being in a setup menu), in the "TX Control" area just
to the left of the filter controls.

- Jeff, K6JCA

--- Al <[EMAIL PROTECTED]> wrote:

> I have been looking in setup for the option to show
> TX filter width on 
> the panadapter and I can no longer find it. I must
> be blind !
> The function still works if I edit the value in the
> .mdb, but I can no 
> longer find the option in setup.
> 
> AL, KØVM
> 
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Re: [Flexradio] CPU Percentage question

[Jeff Anderson]

For reference: my main SDR machine, which is a
non-laptop 3.2GHZ Pentium, runs my SDR without a
problem using only 512MB of memory, and it also has no
problem running debug versions under Visual Studio. 
CPU utilization is somewhere in the range of 10 - 20%.

Which is why I'm so surprised of the cyclical increase
to 60% that I see on my laptop.

- Jeff

--- Robert McGwier <[EMAIL PROTECTED]> wrote:

> So far as I am concerned,  512 MB has not been
> sufficient memory for ANY 
> Microsoft OS under pressure since Windows 98/ME.
> 
> Bob
> 
> 
> Charles Greene wrote:
> > Jeff,
> >
> > 512 MB RAM is not enough to keep from paging
> memory to the HD.  If 
> > you bring up the windows task manager and watch
> the memory parameters 
> > under Performance and try to correlate them with
> CPU %, it might give 
> > you a clue.  As to why other systems operate with
> 512 MB RAM, I don't 
> > have any idea.  My Lap Top doesn't page with 1.5
> GB; 1 GB may be 
> > enough.  Whether this is the only problem, I
> doubt.
> >
> > 73,  Chas
> >
> >   
> 
> 
> -- 
> AMSAT Director and VP Engineering. Member: ARRL,
> AMSAT-DL,
> TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR
> WG Chair
> "Taking fun as simply fun and earnestness in earnest
> shows
> how thoroughly thou none of the two discernest." -
> Piet Hine
> 
> 


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Re: [Flexradio] PA calibration routine

[Jeff Anderson]

I know that my LP-100 Power Meter is calibrated band
by band, and so I'm wondering...how flat across the
spectrum (from 2 to 30 MHz) is response of the
directional coupler within the SDR's PA?

Per the algorithm listed in Eric's email, any changes
in frequency response of the directional coupler could
cause the power reading to be inaccurate at those
frequencies.

- Jeff, K6JCA


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Re: [Flexradio] CPU Percentage question

[Jeff Anderson]

Hi Charles and everyone else who has replied.

I've run through a number of the recommendations, but so far, no joy.

 o No (or little) change if turn OFF the panadpter display.

 o No change if I change indexing per the method on N9VV's website (the
directions in the Flex KB didn't work for me).

 o No change if I disabled quite a few of the startup routines in MSCONFIG
(I didn't disable them all, as I was worried that the computer might come up
in an unusable mode.  Perhaps I should live dangerously.)

 o  No change if I increase the size of the virtual memory.

What's weird is that my other computer, a desk 3.2 GHz P4, runs fine.  Go
figure!

Thanks to all for the help, and best regards!  Will continue
experimenting...

- Jeff, K6JCA



-Original Message-
From: Charles Greene [mailto:[EMAIL PROTECTED]
Sent: Monday, February 05, 2007 2:22 PM
To: Jeff Anderson; Reflector Flex-Radio
Subject: Re: [Flexradio] CPU Percentage question


Jeff,

I'm surprised the 2.8 GHz uses so much CPU time.  Have you optimized
XP per the guide?  I am running a 1.8 GHz Sony VAIO Lap Top with XP
Home and a PreSonus FireBox.  The the CPU runs 6 to 22 percent but
usually stays between 11 and 19 percent, and it updates once every
one to two seconds.  I recently upgraded to 1.5 GB RAM from 512 MB,
primarily because my Grandson plays games on it and there were brief
pauses in the action in which case he would get shot or his plane
would crash.  Before the upgrade when running the SDR, about once per
minute the CPU would hit 100 percent and pause briefly.  Now both the
SDR and the games are happy, and there are no pauses.  The CPU
percent may be a percent or two less, but that wasn't a problem
before.  If fact, the Sony runs faster than my last computer which
was a 2.1 GHz AMD desk top with 512 MB RAM.  I reduced the display
update rate to 12 FPS which is indistinguishable from 15 FPS, and I
optimized XP per the guide.  The Ram upgrade costs about $50 for an
additional 512 MB and $115 for the additional 1 GB and is a 5 minute
installation job.  Well worth it, as the only other thing you can do
is upgrade the CPU which is a tough job in a Lap Top.

73,  Chas W1CG



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Re: [Flexradio] CPU Percentage question

[Jeff Anderson]

Thanks, Tim & Ken, for your replies.

Yesterday I tried turning off the panadapter (and also
reducing the display's FPS), and, surprisingly, that
didn't seem to change the cyclical nature of the mips
consumption.  (I'll have to experiement again this
evening and see if there's an overall change, though.)

Please forgive my dumb questions, but how does one:
 1) turn off indexing 
 2) ensure the cpu has some L2 cache  
 3) create a large swapfile

Thanks for your help!  I'll try to report back this
evening with results...

73,

- Jeff, K6JCA

 
--- Ken N9VV <[EMAIL PROTECTED]> wrote:

> Jeff, I can echo Tim's comments. The only thing that
> seems to help a 
> Laptop at my location is:
> (a) a 7 FPS display rate
> (b) turning OFF the panadapter when I am on freq
> (c) turning off Indexing
> (d) sample rate at 48Khz (Audio/DSP Buffers = 2048)
> (e) making sure the Laptop CPU has some L2 cache. If
> you have a Centrino 
> or Sempron or some "mobile" processor you won't be
> happy (no matter how 
> high the Ghz are, you will still be hitting
> interrupts and context 
> switching that will drive that % way up).
> (f) there are some free utilities out there that can
> help you force CPU 
> speed to stay up (no good for power saving) but that
> is just a bandaid 
> and not a good long term solution.
> Ken
> 
> Tim Ellison wrote:
> > Check several things.
> > 
> > Hard drive on laptops are notoriously slow and
> suck up a bunch of system
> > resources.  Optimize hard drive access by:
> > 
> > - Turning off file indexing
> > - creating a swap file large enough that windows
> doesn't resize it
> > - de-fragmenting the hard drive
> > 
> > Also, most of the CPU taken by PowerSDR is in the
> running of the
> > Panadapter.
> > So you can:
> > - Update your video driver
> > - Change the FPS on the display to a bigger number
> > 
> > Laptops also have a mode where they can dial down
> the CPU speed to save
> > battery life.  Change your power management
> settings on the laptop to
> > full performance mode and do not shut down the
> hard drive after a
> > particular amount of time.
> > 
> > -Tim
> 




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[Flexradio] CPU Percentage question

[Jeff Anderson]

I just hooked up my SDR to a laptop this weekend (I normally run a
floor-mount PC), and I'm seeing some CPU percentage numbers that have me
scratching my head.

The CPU percent number fluctuates over about a 10 second cycle, and goes
from a low of about 15% to a high of around 70%.  This cycle repeats over
and over, and I'm trying to get a handle on what might be the cause.

I'm running a Dell Inspiron laptop with a 2.8 GHz Pentium P4 and 512 Meg
RAM.
Sound card is a Edirol FA-66 running at 192 ksps (Firewire connection to
laptop).
Control Connection is via the USB-to-Parallel port converter.

I've looked at the tasks under task manager, and the PowerSDR is the one
consuming the majority of processor bandwidth.  There might be one or two
other things active (such as Task Manager), but these seem to be in the 1%
range.

Any ideas, or experiments I should try to help me locate the source of this
cyclical peak in CPU usage?

Thanks!

- Jeff, K6JCA

P.S.  I was also experiencing occasional dropouts on the audio - I was able
to eliminate these by doing two things: 
 1) Run the laptop from its AC supply, not its battery.
 2) Disable the internal Wireless network card.


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Re: [Flexradio] Outboard audio equipment

[Jeff Anderson]

Hi Bob,

I'm using a Delta-44, but yes, it's essentially the same thing:  Pro-40
directly to the audio card.  No other external equipment.

- Jeff, K6JCA

-Original Message-
From: Bob Maser [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 01, 2007 7:35 PM
To: John P Basilotto W5GI; 'A.R.S. - W5AMI'; 'Jeff Anderson'
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Outboard audio equipment


I run my PR-40 directly into the Edirol and then it goes into the Flex.  I
assume that this is what K6JCA is doing, right?

Bob W6TR
- Original Message -
From: "John P Basilotto W5GI" <[EMAIL PROTECTED]>
To: "'A.R.S. - W5AMI'" <[EMAIL PROTECTED]>; "'Jeff Anderson'"
<[EMAIL PROTECTED]>
Cc: 
Sent: Thursday, February 01, 2007 9:14 PM
Subject: Re: [Flexradio] Outboard audio equipment


> Brian, Excellent idea. Please post it to the Features request page.
> Thanks.
>
> John P. Basilotto
> W5GI
> Marketing and Product Manager
> FlexRadio Systems
> Office 512-535-5266
> Mobile 512-608-6727
>
>
>
> -----Original Message-
> From: A.R.S. - W5AMI [mailto:[EMAIL PROTECTED]
> Sent: Thursday, February 01, 2007 7:45 PM
> To: Jeff Anderson
> Cc: Edwin Marzan; [EMAIL PROTECTED]; flexradio@flex-radio.biz
> Subject: Re: [Flexradio] Outboard audio equipment
>
> I have lots of outboard audio gear.  Compressor, limiter, mic pre,
> eq's, etc.  I use that primarily with my old KW AM transmitter, but
> have found that just using the mic preamp and a Heil PR-40 into the
> Flex sounds GREAT on AM or SSB.  I'm not even using the built in EQ
> and got some very good audio reports on AM just yesterday.  The key is
> the transmit bandwidth you use.
>
> John (W5GI); I do think in addition to the 10 band EQ, it would be
> very helpful to have an audio limiter built in for AM use.  Is that
> possible?  Seems that since the code is there to measure mic level
> already, that a soft limiter could be coded with a user definable
> threshold in dB units...
>
> 73
> Brian / w5ami
>
>
> On 1/29/07, Jeff Anderson <[EMAIL PROTECTED]> wrote:
>> Ed,  I use a Heil Pro40 and run it directly into the SDR.  No external
>> processing equipment is required, and resulting audio using the 3-band
>> equalizer, per the "gang" I talk with, sounds great (both on wideband SSB
> as
>> well as AM).  I've also heard several other Heil Pro mics directly
>> driving
>> SDRs, and they all sound great, too.
>>
>> I've set the SDR equalizer as follows:
>>
>>   Low:  Midpoint.
>>   Mid:  Midpoint + 1 Tick Mark.
>>   Hi:   Midpoint + 2 Tick Marks.
>>
>> Mic gain is somewhere in the vicinity of 50.
>>
>> - Jeff, K6JCA
>>
>> -Original Message-
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] Behalf Of Edwin Marzan
>> Sent: Monday, January 29, 2007 2:44 PM
>> To: [EMAIL PROTECTED]; flexradio@flex-radio.biz
>> Subject: Re: [Flexradio] Outboard audio equipment
>>
>>
>> Sounds to me that a 10 band eq should be able to foot the bill.
>>
>> I have a Heil PR20 microphone and I hoping to tweak it with the built in
> eq
>> to get that hi fi sound.
>>
>> As far as creating user defined features by programming in C#, it's out
>> of
>> my league for now. DSP theory is also quite complex. I can do light VBA
>> programming and some of the best code I've written was written by someone
>> else. Perhaps as some of the programming tools become easier to use and
> the
>> abundance of coding examples become available more of us will be able to
>> contribute to the ever evolving front end of this fantastic radio. But
>> for
>> now I must rely on the extremely talented DSP gurus to do the job.
>>
>>
>>
>> Edwin Marzan
>> AB2VW
>>
>>
>>
>>
>>
>> >From: "John P Basilotto W5GI" <[EMAIL PROTECTED]>
>> >To: "'Edwin Marzan'"
> <[EMAIL PROTECTED]>,
>> >Subject: RE: [Flexradio] Outboard audio equipment
>> >Date: Mon, 29 Jan 2007 14:27:06 -0600
>> >
>> >PowerSDR has most of the features needed to sound like a broadcast
> station.
>> >The most important feature is the ability to set filter width, which is
> the
>> >primary factor is sounding like a commercial station.  External audio
> gear
>> >like the W2IHY boxes and other products typically used by serious
>> >audiophiles will enhance the audio quality of any radio including the
>> >SDR1K.
>> >I have a professional softwa

Re: [Flexradio] Outboard audio equipment

[Jeff Anderson]

Ed,  I use a Heil Pro40 and run it directly into the SDR.  No external
processing equipment is required, and resulting audio using the 3-band
equalizer, per the "gang" I talk with, sounds great (both on wideband SSB as
well as AM).  I've also heard several other Heil Pro mics directly driving
SDRs, and they all sound great, too.

I've set the SDR equalizer as follows:

  Low:  Midpoint.
  Mid:  Midpoint + 1 Tick Mark.
  Hi:   Midpoint + 2 Tick Marks.

Mic gain is somewhere in the vicinity of 50.

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Edwin Marzan
Sent: Monday, January 29, 2007 2:44 PM
To: [EMAIL PROTECTED]; flexradio@flex-radio.biz
Subject: Re: [Flexradio] Outboard audio equipment


Sounds to me that a 10 band eq should be able to foot the bill.

I have a Heil PR20 microphone and I hoping to tweak it with the built in eq
to get that hi fi sound.

As far as creating user defined features by programming in C#, it's out of
my league for now. DSP theory is also quite complex. I can do light VBA
programming and some of the best code I've written was written by someone
else. Perhaps as some of the programming tools become easier to use and the
abundance of coding examples become available more of us will be able to
contribute to the ever evolving front end of this fantastic radio. But for
now I must rely on the extremely talented DSP gurus to do the job.



Edwin Marzan
AB2VW





>From: "John P Basilotto W5GI" <[EMAIL PROTECTED]>
>To: "'Edwin Marzan'" <[EMAIL PROTECTED]>,
>Subject: RE: [Flexradio] Outboard audio equipment
>Date: Mon, 29 Jan 2007 14:27:06 -0600
>
>PowerSDR has most of the features needed to sound like a broadcast station.
>The most important feature is the ability to set filter width, which is the
>primary factor is sounding like a commercial station.  External audio gear
>like the W2IHY boxes and other products typically used by serious
>audiophiles will enhance the audio quality of any radio including the
>SDR1K.
>I have a professional software defined audio system, which is overkill for
>amateur applications but it's certainly fun to play with.  We are planning
>to add a 10 band EQ to the PowerSDR but beyond that there are no plans to
>add additional audio applications. The beauty of our product is that if you
>know how to write software you can develop your own software defined audio
>tools within PoerSDR.
>
>John P. Basilotto
>W5GI
>Marketing and Product Manager
>FlexRadio Systems
>Office 512-535-5266
>Mobile 512-608-6727
>
>
>
>-Original Message-
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] On Behalf Of Edwin Marzan
>Sent: Monday, January 29, 2007 2:15 PM
>To: flexradio@flex-radio.biz
>Subject: [Flexradio] Outboard audio equipment
>
>Hardware defined versus software defined.
>
>Do FlexRadio Owners really need outboard equipment (equalizers,
>compressors,
>
>noise gates etc) in order to get that high fidelity sound on AM and SSB?
>
>Can all of the parameters that create the hi fi sound be created in
>software? Since our radios are software defined shouldn't that be the case?
>
>I was thinking of purchasing the eight band eq from W2IHY. Is there
>something that this product delivers that cannot be delivered via software
>if not now perhaps in the near future?
>
>I noticed a few ads on QTH.com stating they are selling their eq because
>they are switching to the Flex. Do these folks know something that I don't?
>
>Thanks again...
>
>
>
>Edwin Marzan
>AB2VW
>
>_
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>
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Re: [Flexradio] sdr swr

[Jeff Anderson]

Hi Jim,

Thanks for the reply, and my apologies...despite your discussion (some of
which I agree with), I honestly can't tell if you agree with my position (or
not), but from your reply's tenor I suspect you disagree.  My position
remains as stated below:

"In my opinion, the discussion really comes down to this:  if you believe
that changing a signal generator's impedance from 50 ohms to 100 ohms by
adding a series resistor at the *generator* end of the transmission line
that is matched to its load will make a 1:1 SWR suddenly 2:1, or if you
believe, more generally, that generator's output impedance affects SWR (as
we normally define SWR with respect to a line's "characteristic" impedance
and the load impedance), then, respectfully, we're going to have to agree to
disagree."

Finally, we're drifting far afield from SDR themes, so I would recommend
that we close out this thread.

Thanks for the interesting discussion, and best regards,

- Jeff, K6JCA


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Re: [Flexradio] sdr swr

[Jeff Anderson]

Hi Jim,

If you believe that changing a signal generator's impedance from 50 ohms to
100 ohms by adding a series resistor at the *generator* end of the
transmission line that is matched to its load will make a 1:1 SWR suddenly
2:1, or if you believe, more generally, that generator's output impedance
affects SWR (as we normally define SWR with respect to a line's
"characteristic" impedance and the load impedance), then, respectfully,
we're going to have to agree to disagree.

I'll simply mention that SWR can be expressed in terms of the reflection
coefficient, and that the reflection coefficient, in turn, can be stated as
an algebraic expression containing terms for the load (termination)
impedance and the transmission line's characteristic impedance, but it does
not contain any terms representing a "source" impedance.

Best regards,

- Jeff, K6JCA


-Original Message-
From: Jim Lux [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 28, 2007 10:04 AM
To: Jeff Anderson; [EMAIL PROTECTED]; k5nu; FlexRadio@flex-radio.biz
Subject: RE: [Flexradio] sdr swr


At 07:36 AM 1/28/2007, Jeff Anderson wrote:
>Hi Peter,

Actually, that was my statement...not Peter's

>I believe your statement that SWR is affected by the generator's impedance
>is a common misconception.  Actually, SWR, as is typically defined, is
>independent of generator (i.e. transmitter, in our case) impedance.  It is
>only a function of the impedance of the transmission line and the load
>impedance.  In other words, if the transmission line Z is 50 ohms and the
>load is 50 ohms (resistive), the SWR should be 1:1, irrespective of the
>transmitter's impedance.


Not really... It matters not whether you are the generator looking at
the load or the load looking back towards the generator.  The
mismatch in the line is the same either way.   That is, if I have a
SWR meter and I reverse it, I should get the same number... If you
use a Bird.. you can put it in either way, make the two measurements
(one with the slug each eay) do the math on the measurements and get
the same number.

Try it..


>In your example of a transmitter with an output Z of 100 ohms, indeed, you
>are correct that it isn't matched to transmission line, but this will have
>no effect on the SWR (it only affects the power that the transmitter is
able
>to provide to the transmission line): if the load is matched to the line,
>there are no reflections from the load end, and thus there are no standing
>waves, and therefore the result is an swr of 1:1.

Again.  write out the equations and try it..  Or do the experiment
with a directional power meter and known mismatches.

You can make a 100 ohm source by taking a good 50 ohm source (say an
oscillator feeding a 10dB pad) and putting a 50 ohm resistor in series.



Jim, W6RMK



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Re: [Flexradio] sdr swr

[Jeff Anderson]

Hi Peter,

I believe your statement that SWR is affected by the generator's impedance
is a common misconception.  Actually, SWR, as is typically defined, is
independent of generator (i.e. transmitter, in our case) impedance.  It is
only a function of the impedance of the transmission line and the load
impedance.  In other words, if the transmission line Z is 50 ohms and the
load is 50 ohms (resistive), the SWR should be 1:1, irrespective of the
transmitter's impedance.

In your example of a transmitter with an output Z of 100 ohms, indeed, you
are correct that it isn't matched to transmission line, but this will have
no effect on the SWR (it only affects the power that the transmitter is able
to provide to the transmission line): if the load is matched to the line,
there are no reflections from the load end, and thus there are no standing
waves, and therefore the result is an swr of 1:1.

Best regards,

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Sunday, January 28, 2007 7:23 AM
To: Jim Lux; k5nu; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] sdr swr


Jim, see in text
73 (sorry no spell checker on this system...)
groeten Peter
petervn(a)hetnet.nl   ; pa0pvn(a)hetnet.nl
   ;
pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org .




From: Jim Lux [mailto:[EMAIL PROTECTED]
Sent: Sun 28-1-2007 15:55
To: [EMAIL PROTECTED]; k5nu; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] sdr swr



At 03:08 AM 1/28/2007, [EMAIL PROTECTED] wrote:
>Mike
>
>
>
>What is still wondering me the most is that when the SWR is close to
>1, the transmitter impedance
>
>should not have any influence on the SWR.

Actually, no..  think about this... what if the Transmitter output Z
were 100 ohms... You'd still see a mismatch.

In the simplistic sort of view, a 50 ohm line hooked to a 50 ohm load
presents a 50 ohm impedance at the other end of the line, so you'd
think that the mismatch localized at that point.  BUT, say you broke
that line half way, and put the meter there.  Looking back towards
the transmitter, you see 100 ohms, with some length of 50 ohm line
(i.e. probably something other than 100 ohms, and almost certainly
NOT 50  ohms), looking towards the load, you see 50 ohms.  So the
mismatch is apparent no matter where along the line you look.


If there in no power coming back then you do
not see the impedance of the transmitter.


Most SWR meters, also, make the assumption that they are in a 50 ohm
line.  That is, they don't actually measure the voltage along the
line at several points and calculate the standing wave ratio in a "Z
independent" way. (they're not a slotted line with a
probe...)  Therefore, while the can measure SWR (which is pretty much
the same everywhere in the line) they can't measure absolute Z very
accurately (that is, they can't tell you WHERE the mismatch is) nor
can they accurately measure the forward and reflected power separately..


As far as I know most SWR meters are in fact 2 directional couplers,
and are working pretty well. To measure without bothering to much
over the tranmitter impedance one can put a -3 or -6 dB Power attenuator
between the Transmitter and the SWR meter. I found that this is verry
usefull if you are mesuring in high SWR conditions. Then the tramsmitter
impedance is working with the reflected power.

I always think of an endless coax in an properly terminated system.


>All the energy coming from the transmitter is absorbed
>
>in the antenna system, nothing comes back. The transmitter sees 50 ohm.
>
>
>
>   50 ohm  ->-- coax-SWRmeter-coax---antenna(or
> dummy), all 50 ohm's
>
>
>
>If the transmitter does not like this 50 ohms does not matter for
>the SWR, might however cook
>
>the transmitter. The transmitter of the SDR is build for a 50 ohm load.
>
>
>
>Keep in mind that the output impedance of a transmitter is almost
>never 50 ohm, but the
>
>transmitter is build to operate efficiently with a 50 ohm load.

An excellent point Peter makes here.  Say the transmitter had a zero
output impedance (i.e. it was a stiff voltage source, like a high
quality audio amplifier).  It would drive the 50 ohm load just fine,
although the transmitter "efficiency" might vary quite a bit,
depending on the design.

But, in such a system, an external power or VSWR meter is not going
to give results that look the same as in a system with 50 ohm outs and ins.

All the Thevenin match criteria says is that if source and load Z are
conjugates, you get maximum *net* power transfer. (consider a source
with 50+50j Z and a load with 50-50j... complex conjugates.. the 50j
on the source cancels the -50j on the load.  so this transfers
power from generator to sink most efficiently.. but there's "reactive
power" circulating back and forth between the two..  While it's
theoretically the same 100% efficiency as a 50+0j to 50

Re: [Flexradio] sdr swr

[Jeff Anderson]

Mike,

Here's an experiment to try:  unplug, at the SDR, the audio cable from the
PC's Line-Out to the SDR (this is the TX audio signal).  Now click on TUNE.
What happens?

(With no TUNE audio, power out should be 0 watts).

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of k5nu
Sent: Sunday, January 28, 2007 5:08 AM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] sdr swr


A question for the group.  On the "transmit" tab I have the Tune set to
Zero.  I still have 35w output as I click the Tune button.  Is that normal?
Also on my external wattmeter, the power out in the "Tune" position, is very
unstable.  It will "flutter" back and forth by as much as 25-30 watts.  This
makes it very difficult to tune an amp.  With the power out jumping around.
etc.

All calibrations have been done in the method suggested by various sdr users
here on the reflector.  My patience is wearing very thin.

73,  Mike K5NU
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Re: [Flexradio] sdr swr

[Jeff Anderson]

With my SDR, 0 watts in the Tune Setup equates to 0 watts out when in Tune
mode.  You've probably already done this, but make sure you've clicked on
the "Apply" (Or "OK") button after changing the tune power to ensure that
the software sees it.  Otherwise, you may think that you've changed it to 0
watts, but software may think the setting is still 35 watts.

You've described two problems:  1) Tune power should be 0, but instead
fluctuates up to 35 watts, and 2) SWR on an external meter should read
almost 1:1, but reads almost 4:1.

Regarding the 1st problem, some possibilities are:  this could be a problem
with the SDR amplifier self-oscillating.  What's the SWR when this occurs?
Or, because the "Tune" level is set by audio from the soundcard, perhaps it
could be a flakey sound-card output or bad connection between the sound-card
and the Line-Out jack of the SDR, or perhaps even a very bad ground-loop?
The 3/8" connectors on the back of the SDR can be flakey (mine are) - try
jiggling the cables back there.  (You might also try installing a
Radio-Shack ground-loop isolator.)

Regarding the 2nd problem (which might be related to the first):  if your
external meter reads almost 4:1 (and it reads 1:1 with all other
transmitters), then the first suspect, in my opinion, is the SDR.  And the
most likely cause is that it's producing a significant amount of power at a
frequency that is different than the tuned frequency of your antenna.  As
Jim Lux mentioned, the PA might be bad and producing a very distorted
waveform (which will generate harmonic energy that will surely raise your
SWR), or perhaps the transmitter is transmitting at a different frequency
(here's another dumb point which you've probably already verified:  make
sure your XIT is Off and also that you're only operating in VFO-A mode, not
dual vfo modes).  I'm not sure what would cause transmission at an incorrect
frequency, though.  Perhaps the digital signal from the PC to the SDR (which
sets the frequency) is being corrupted by noise?  Do you ever experience
problems setting the receive frequency?

If you have an oscilloscope, I'd recommend looking at the TX waveform &
frequency.  Lacking that, you might try listening to it with another
receiver.

Good luck on your hunt.  I'd recommend giving Flex-Radio a call on Monday.

73,

- Jeff, K6JCA

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of k5nu
Sent: Sunday, January 28, 2007 5:08 AM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] sdr swr


A question for the group.  On the "transmit" tab I have the Tune set to
Zero.  I still have 35w output as I click the Tune button.  Is that normal?
Also on my external wattmeter, the power out in the "Tune" position, is very
unstable.  It will "flutter" back and forth by as much as 25-30 watts.  This
makes it very difficult to tune an amp.  With the power out jumping around.
etc.

All calibrations have been done in the method suggested by various sdr users
here on the reflector.  My patience is wearing very thin.

73,  Mike K5NU
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Re: [Flexradio] Spur on AM

[Jeff Anderson]

--- Jim Lux <[EMAIL PROTECTED]> wrote:

> 
> perhaps not "distortion" per se, but poor image
> rejection.  A CW tone 
> swept through the pass band will find those phase
> imbalance errors 
> quite effectively.

No, it was distortion, not an image, and measured by
sweeping a cw tone.  On the sdr display I could see
the signal, its image (down about 40 dB), and a third
spur (down about 50 dB) that moved at twice the sweep
rate of the signal.  But its amplitude did decay down
into the noise fairly quickly as I sweeped the signal
away from IF 0.

> 
> >   I did not see these when the isolator was
> >*not* in-circuit.  But they seemed to disappear
> pretty
> >quickly as I moved the generator away from the IF 0
> >frequency, so these may not be a significant issue,
> Indeed..  On the other hand, in theory, this sort of
> thing is able to 
> be calibrated out.   Last year, there was some
> discussion about 
> providing a means to calibrate the audio path at
> more than a single 
> point.  All it takes is figuring out the frequency
> domain response 
> needed, and combining that with the other frequency
> domain 
> filters.  No additional CPU horsepower needed.
> 
> 
> Jim, W6RMK 
> 

I agree that one should be able to design an impulse
response (or a series of them), that, when convolved
with the input signal, should fix I/Q phase and
amplitude mismatch problems.  (But I'm certainly not
the person to do this!)

However, the distortion issue is a different problem,
and not one that, I believe, can be easily compensated
for in software.

73,

- Jeff, K6JCA

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Re: [Flexradio] Spur on AM

[Jeff Anderson]

Hi Tom,

I believe the bandpass will depend, in part, on the
input impedance of the device to which it's attached.

Many months ago I measured the passband of one of
these  devices for a friend who had terrible hum with
her stereo and wanted to use one of these, and it was
flat out to 50k (which was the limit of my dsp-based
measurement system) into the fairly-high impedance of
the measurement system and using a low output
impedance white-noise generator as the source.

I just took a look at the low frequency performance on
my sdr1k with the RS isolator and my Delta 44.  I fed
the SDR with white noise (from an old GR noise
generator that I use expressly for this sort of
thing),  and I expected to see a "notch" on the
display corresponding to the device's low frequency
cutoff.  Suprisingly, even at max Zoom In (6
Hz/pixel?) and with the display shifted so that the IF
0 frequency was centered in the display, I think I
*might* have seen the *hint* of a notch.

Another negative that I did see, though, were some
distortion products that became visible as one sweeps
a generator (I used my 8640b) through the IF "0"
frequency.  I did not see these when the isolator was
*not* in-circuit.  But they seemed to disappear pretty
quickly as I moved the generator away from the IF 0
frequency, so these may not be a significant issue,
or, perhaps, only an issue for signals near the (now
much attenuated) "hump."  But this raises a point
worth noting: additional devices in the audio path,
such as the gnd-loop-isolator, could add some amount
of distortion to the receive signals.

- Jeff

--- Tom Thompson <[EMAIL PROTECTED]> wrote:

> Jeff,
> 
> What does the bandpass of the isolator look like
> compared to what we are 
> trying to pass?  I am sure that a better transformer
> could be had if it 
> would help.  As far as the hump is concerned, isn't
> it  just those 
> frequencies close to DC that cause it?
> 
> Tom   W0IVJ
> 
> Jeff Anderson wrote:
> 
> >I just made a few more measurements using my Delta
> 44 and some of my test
> >equipment.  Adding in the ground-loop isolator to
> the Line-In path has the
> >following effects:
> >
> >Positive:
> >
> >1.  Noticably reduces the IF "hump".
> >2.  "Flattens" the display (w/o the isolator, I see
> a bit of rolloff towards
> >the display edges when in 0.5x zoom mode.
> >
> >Negative:
> >
> >1.  Image rejection worsens at the display edges. 
> That is, if a strong
> >signal is in the receive audio passband (I used a
> -40 dBm signal) and you
> >null its image down to the noise-floor, if you then
> shift the frequency of
> >the received signal (but not the receiver's VFO-A
> frequency), you'll see the
> >image begin to reappear.  If the signal is moved in
> frequency such that the
> >image is at the edge of the display (again, in 0.5x
> zoom mode), it appears
> >to me that the image rejection is about 10 dB worse
> *with* the line
> >isolator.  In other words, it's in the mid to high
> 30's (of dBs) instead of
> >the mid 40's.  (Note, though, that in either case,
> the image can be nulled
> >down to the noise).
> >
> >I'm not sure that the positives outweigh the
> negatives, but it raises some
> >questions:
> >
> >1.  Can an "isolator" be designed, in hardware, to
> maximize the positives
> >and minimize the negative?
> >2.  Could a filter be designed so that, when it's
> convolved with the input
> >signal, we maximize image rejection across the
> whole display, and not just
> >at the frequency for which the image is nulled. 
> That is, can the "bowl"
> >shaped response to image rejection (when viewed
> across the entire display)
> >be flattened?  If so, how could this be done.  (And
> what's the plan
> >regarding the use of the pulse generator that's in
> the hardware?)
> >
> >- Jeff, K6JCA
> >
> >
> >-Original Message-
> >From: [EMAIL PROTECTED]
> >[mailto:[EMAIL PROTECTED] Behalf
> Of Tim Ellison
> >Sent: Tuesday, January 23, 2007 7:29 AM
> >To: Joe - AB1DO; FlexRadio@flex-radio.biz
> >Subject: Re: [Flexradio] Spur on AM
> >
> >
> >When I added a Jensen line isolator to my system I
> did notice that the
> >noise floor dropped by a few dB after recalibrating
> I/Q along with a
> >very noticeable decrease in the 0 IF noise hump.
> >
> >-Tim W4TME
> >-
> >
> >-Original Message-
> >From: [EMAIL PROTECTED]
> >[mailto:[EMAIL PROTECTED] On Behalf
> Of