Re: [Flexradio] SO2R is on the air with the F5K

2010-01-13 Thread radioart
Very impressive Lee; great job!!

Dennis Petrich
Amateur Radio Station K0EOO
Lakeville Minnesota USA
k0...@arrl.net
952-898-1082

- Original Message -
From: Lee A Crocker lee_croc...@yahoo.com
To: Flexradio FlexRadio@flex-radio.biz
Sent: Tuesday, January 12, 2010 8:57:15 PM GMT -06:00 US/Canada Central
Subject: [Flexradio] SO2R is on the air with the F5K

http://w9oy-sdr.blogspot.com/2010/01/flex-radio-so2r-is-on-air.html

Check out my blog entry regarding our work to date!

73  W9OY



  
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[Flexradio] VAC set-up

2010-01-13 Thread Robin Haighton
While it is always a pleasure telling Hams about the benefits of the 5K and
3K it would be great to tell them that there is a single step-by- step write
up on the Flex site on how to set up Com0com, VAC. CAT and MixW (or
similar)that is up- to date .. perhaps I am missing it ..( I acknowledge
there are write ups that deal with the subjects separately   but I cannot
find a single write up) 

 

VE3FRH

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Re: [Flexradio] SO2R is on the air with the F5K

2010-01-13 Thread Pete Lindsay
Hi Lee,

Very interesting post thanks! I seem to have a problem with trying to
change between Tx'ing on VFO A and VFO B. When N1MM send the FT1 CAT
command to set the VFO B to Tx this seems to switch on the SPLIT
function in Power SDR (I'm using 1.18.3). This has the bizarre affect
of setting the TX frequency not to that of RX2 but to the last used
frequency of the VFO B used by the MultRX , even though MultRX is
not switched on!! The manual seems to suggest that this is the
expected mode of operation of the SPLIT function, how did you get
round this?

73

Pete, G4CLA.

2010/1/13 Lee A Crocker lee_croc...@yahoo.com:
 http://w9oy-sdr.blogspot.com/2010/01/flex-radio-so2r-is-on-air.html

 Check out my blog entry regarding our work to date!

 73  W9OY




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Re: [Flexradio] Preamp vs AGC-T?

2010-01-13 Thread Michael Jones
Hi Brian,

That's a very good explanation - thanks!


Best regards,

Michael Jones W0STB
SCSI Toolbox LLC
www.scsitoolbox.com
303-972-2072


-Original Message-
From: br...@lloyd.com [mailto:br...@lloyd.com] On Behalf Of Brian Lloyd
Sent: Tuesday, January 12, 2010 4:26 PM
To: mi...@scsitoolbox.com
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Preamp vs AGC-T?

On Sun, Jan 10, 2010 at 11:55 AM, Michael Jones mi...@scsitoolbox.com
wrote:
 Hello All,



 I'm wondering what is the relationship between the AGC-T setting and 
 the pre amp setting?

They are different, way different. You use them for completely different
things.

Probably the first thing to do is to read the article that was written on
the topic of AGC Threshold (AGC-T) and placed in the knowledge base
at:

http://kc.flex-radio.com/KnowledgebaseArticle50153.aspx

That covers how best to use the AGC-T control.

 For instance, is changing the preamp from off to Pre1 doing the 
 same thing as raising the AGC-T setting some set amount?

No.

 What is the recommendation for improving copy of a weak signal? Is it 
 to turn up the Pre amp setting, or too turn up AGC-T?

It depends on the level of atmospheric noise being received.

 From input from the list here I have gotten very wary of ever turning 
 up the
 AGC-T setting past 70 or 75 - maybe that's just an unfounded fear - LOL!

Definitely. I am trying to think of when I ever set AGC-T below about
80 but then, I don't seem to use it the same way as others since I want the
noise to be audible.

Think of the AGC Threshold (AGC-T) control more of an RF gain control.
You can use it to turn down the sensitivity of the receiver. The preamp is
able to actually increase the sensitivity of the receiver.

You need to understand two key things:

1. the relationship between the internal noise of the receiver and the
external noise being picked up by the antenna;

2. the job of AGC to reduce the gain of the receiver so that very strong
signals appear to be about the same level as a weak signal.

What is not always obvious is the relationship between the two and that is
probably why you are asking this question.

Perhaps the first thing to do to understand all this is to understand the
relationship between the receiver's internal noise (noise figure) and noise
picked up by the antenna. This is easy to do if you try a simple experiment.

Connect your receiver to a dummy load, turn off the preamp, and adjust the
panadaptor to show -145dBm on the bottom. Select 20m USB and set the filter
to 2.7kHz. At this point the S-meter should be showing about -110 dBm. That
represents that equivalent noise power of the receiver. Basically, until a
signal reaches that power level you aren't going to hear it.

Now turn on the preamp. Notice that the noise power level drops to about
-123 dBm. This is the new noise floor. The preamp's noise now dominates the
system noise as opposed to the noise in the rest of the receiver chain. This
means that the receiver can now hear a 2.7 kHz wide signal that is at -123
dBm, about a 13dB improvement over the receiver without the preamp. Notice
also that we haven't even touched the AGC-threshold control.

One more thing before we go on, try changing the filter width. You will
notice that when you double the filter bandwidth the S-meter shows a 3dB
increase in noise. That is because twice the bandwidth admits twice the
noise power (given equal noise power per Hz). You may also notice that the
noise level reported by the panadaptor is much less than the noise reported
by the S-meter. That is because the panadaptor use a series of very narrow
filters (FFT bins) to make up the measurement. If you set the filter width
to the same as the FFT bin width then both the panadaptor and the S-meter
would show the same noise power.

Turn the preamp back off. Switch from the dummy load to the antenna.
You may notice that the noise level does not increase very much. (You can
look at the panadaptor if you like.) If it doesn't increase at all that
means that the noise generated by the receiver is greater than the noise and
signal being picked up by the antenna. It also means that you might not hear
a signal right at the noise level.

Now repeat the same test with the preamp on. Notice that there is a
noticeable increase in noise floor when you connect and disconnect the
antenna. Now you know that the system noise is being dominated by received
noise. Your receiver will now hear any signal that is hearable.

On my Flex 5000 with the noise at my location on 20m, the noise level
typically rises about 3dB when I connect the antenna with the preamp turned
off. That means that the noise contributed by the antenna is about equal to
the noise in the receiver. I would probably get a little improvement from
the preamp (but not much). Once I get to 15m and above, the preamp is needed
in order to hear the minimum discernible signal.

 I've notice that changing the preamp setting does not change the 
 levels I 

Re: [Flexradio] VAC set-up

2010-01-13 Thread Brian Lloyd
On Wed, Jan 13, 2010 at 7:13 AM, Robin Haighton ve3...@cogeco.ca wrote:
 While it is always a pleasure telling Hams about the benefits of the 5K and
 3K it would be great to tell them that there is a single step-by- step write
 up on the Flex site on how to set up Com0com, VAC. CAT and MixW (or
 similar)that is up- to date .. perhaps I am missing it ..( I acknowledge
 there are write ups that deal with the subjects separately   but I cannot
 find a single write up)

I just wrote one and posted it here a week or so ago but it was for fldigi.

-- 
73 de Brian, WB6RQN/J79BPL

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[Flexradio] Edirol FA-66 Driver for Win7

2010-01-13 Thread Anton Iriawan
Good News for SDR-1000 users,

Edirol FA-66 driver for Windows 7 32bit  64bit now available for download on 
Roland Website:

http://www.roland.com/products/en/_support/dld.cfm?ln=endsp=0iCncd=688


73 de Anton - YB5QZ



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[Flexradio] SO2R is on the air with the F5K

2010-01-13 Thread rich kennedy
Lee's writeup and photos are a work-of-art!
This documentation should show some of the power of the Flex and its ability to 
adequately do SO2R!  Thanks Lee, keep up the excellent work.

73, Rich, K3VAT

 
--

Message: 6
Date: Tue, 12 Jan 2010 18:57:15 -0800 (PST)
From: Lee A Crocker lee_croc...@yahoo.com
Subject: [Flexradio] SO2R is on the air with the F5K
To: Flexradio FlexRadio@flex-radio.biz
Message-ID: 583100.49175...@web57001.mail.re3.yahoo.com
Content-Type: text/plain; charset=us-ascii

http://w9oy-sdr.blogspot.com/2010/01/flex-radio-so2r-is-on-air.html

Check out my blog entry regarding our work to date!

73  W9OY


  
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[Flexradio] SDR 1000 for sale

2010-01-13 Thread Scott Blixt
SDR 1000 100w unit. Internal ATU. M-Audio Delta 44 audio with breakout box.  
Also small circuit board that replaces the breakout box. Asking $700 +sh








Scott Blixt
KA0JWC
Montgomery, MN
sbl...@means.net





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[Flexradio] AGC-T vs PreAmp

2010-01-13 Thread Michael Jones
Thanks to everyone who responded to my question.

I did the experiments with the dummy load, etc - that was really interesting
and fun. It totally made the whole thing clear in my mind - I guess I learn
best by seeing things. 

 

The community here sure is great - what a great bunch of helpful folks!

 

Many thanks again.

 

Oh, now that I'm thinking about how well my questions get answered - I'll
post a second one with a new title to keep things clean.

 

Best regards,

 

Michael Jones W0STB

SCSI Toolbox LLC

www.scsitoolbox.com http://www.scsitoolbox.com/ 

303-972-2072

 

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[Flexradio] SR button

2010-01-13 Thread Michael Jones
I know the SR button stands for Spur Reduction, but I'm not certain what
that means in practical terms. 

Is a spur like an image signal?

 

What got me thinking about this is the fact that CW Skimmer wants this to be
turned off. I can see that Skimmer sees things differently with it on or
off, but I don't know why that is.

 

Also - is this something that has to do with receive only?

What's really on my mind is - when I stop using Skimmer is it very important
that I turn SR back on?

 

Flex 3K, 1.19.3 svn 3495, Win7-64

 

 

Best regards,

 

Michael Jones W0STB

SCSI Toolbox LLC

www.scsitoolbox.com http://www.scsitoolbox.com/ 

303-972-2072

 

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Re: [Flexradio] Audio Interface

2010-01-13 Thread Joe Camilli
Thank you all for your insight and comments

Joe N7QPP

On Tue, Jan 12, 2010 at 10:41 AM, Jesse N4BFD n4b...@gmail.com wrote:

 I'd check out some of the Behringer audio mixers, they are perfect for what
 you are looking to do and made for the job..  I use a rack mounted one in my
 shack for the same thing, works great!
 N4BFD

 Jesse
 http://www.qrz.com/db/N4BFD


   On Mon, Jan 11, 2010 at 9:36 AM, Joe Camilli joen7...@gmail.com wrote:

  I am posting this here because many Flexers have experience with
 external
 sound interfaces – due to the early Flex radio. So here is a description
 of
 my current sources of audio:

 Flex-3000 – HF radio

 Icom 2200H – 2M radio

 Yeasu  FT-60 – 2/440 radio

 RS Pro 97 – scanner

 Computer



 All except the computer are mono audio sources.



 The goal is to make the computer an audio hub thus allowing me the ability
 to control the volume of each audio source through one set of speakers
 attached to the computer. I was looking at the Delta 44 or the Delta
 1010LT
 interface. I would like to get some feedback on this approach, would it
 have
 an impact on the Flex-3000 since this computer also runs PSDR.
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Re: [Flexradio] FlexRadio Digest, Vol 57, Issue 13

2010-01-13 Thread gpinos
Flex-5000a with optional auto tuner in new condition only 8 months old  
,with box,manual,cd,firewire cable and heil goldline microphone with  cable.
$2500.00 847-877-5501 gene
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Re: [Flexradio] SR button

2010-01-13 Thread AA8K73 GMail


Spur Reduction: Adds the use of a software oscillator to avoid 
DDS frequencies known to have a higher phase truncation related 
spurious response. In short, rather than tuning each frequency 
using the DDS (this is what happens when this option is turned 
off), the software tunes the DDS in 3kHz steps and does 
fine-tuning in software. Tuning in 3kHz steps also has the 
advantage of having to send fewer command signals to the hardware.


-From the manual, page 84



CW Skimmer is not intelligent enough to dodge the spurs and 
won't follow the Flex-3000's algorithm.




Michael Jones wrote:

I know the SR button stands for Spur Reduction, but I'm not certain what
that means in practical terms. 


Is a spur like an image signal?

 


What got me thinking about this is the fact that CW Skimmer wants this to be
turned off. I can see that Skimmer sees things differently with it on or
off, but I don't know why that is.

 


Also - is this something that has to do with receive only?

What's really on my mind is - when I stop using Skimmer is it very important
that I turn SR back on?

 


Flex 3K, 1.19.3 svn 3495, Win7-64

 

 


Best regards,

 


Michael Jones W0STB



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Re: [Flexradio] SR button

2010-01-13 Thread Brian Lloyd
On Wed, Jan 13, 2010 at 10:13 AM, Michael Jones mi...@scsitoolbox.com wrote:
 I know the SR button stands for Spur Reduction, but I'm not certain what
 that means in practical terms.

 Is a spur like an image signal?

Not really. The local oscillator (VFO) is a DDS oscillator that is
programmed to generate a certain frequency. Normally the Flex uses an
IF frequency of 9kHz. So if you want to receive a signal at 14,009 kHz
normally the VFO would generate 14,000 kHz. 14,000 kHz when mixed with
14,009 kHz produces the IF at 9kHz.

But sometimes a programmed value in the DDS VFO produces an internal
divisor that results in not only the desired output but one or more
additional low-level spurious outputs (spurs). Flex has identified
which values do this and change the behavior of the radio slightly. If
the DDS VFO were to produce spurs at a VFO frequency of 14,000kHz but
not at 13,999 kHz then PowerSDR commands the radio to use 13,999kHz
for the VFO frequency but then changes the IF to 10kHz. Now 14,009kHz
- 13,999 kHz = 10kHz.

So, in short, PowerSDR changes both the VFO frequency and the IF
frequency behind the scenes so that the spurs do not show up. Pretty
clever those Flexians.

 What got me thinking about this is the fact that CW Skimmer wants this to be
 turned off. I can see that Skimmer sees things differently with it on or
 off, but I don't know why that is.

It is because of the magic hand-waving above. CW Skimmer always uses
the same IF so the DDS VFO *must* produce the expected frequency or
the frequency calculated in CW Skimmer would be incorrect.

 Also - is this something that has to do with receive only?

No, this is done for transmit as well.

 What's really on my mind is - when I stop using Skimmer is it very important
 that I turn SR back on?

Yes. It not only avoids spurs but it makes tuning much faster because
PowerSDR doesn't need to change the frequency of the VFO for every 1Hz
of frequency change.

-- 
73 de Brian, WB6RQN/J79BPL

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Re: [Flexradio] SR button

2010-01-13 Thread Michael Jones
Hi Brian,

Great info - thanks!

That is so amazing to think that the radio can know when it has a problem
like that and adapt to it - wow.

Man, these guys at Flex are awesomely smart! 


Best regards,

Michael Jones
SCSI Toolbox LLC
www.scsitoolbox.com
303-972-2072

-Original Message-
From: br...@lloyd.com [mailto:br...@lloyd.com] On Behalf Of Brian Lloyd
Sent: Wednesday, January 13, 2010 12:43 PM
To: mi...@scsitoolbox.com
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] SR button

On Wed, Jan 13, 2010 at 10:13 AM, Michael Jones mi...@scsitoolbox.com
wrote:
 I know the SR button stands for Spur Reduction, but I'm not certain 
 what that means in practical terms.

 Is a spur like an image signal?

Not really. The local oscillator (VFO) is a DDS oscillator that is
programmed to generate a certain frequency. Normally the Flex uses an IF
frequency of 9kHz. So if you want to receive a signal at 14,009 kHz normally
the VFO would generate 14,000 kHz. 14,000 kHz when mixed with
14,009 kHz produces the IF at 9kHz.

But sometimes a programmed value in the DDS VFO produces an internal divisor
that results in not only the desired output but one or more additional
low-level spurious outputs (spurs). Flex has identified which values do this
and change the behavior of the radio slightly. If the DDS VFO were to
produce spurs at a VFO frequency of 14,000kHz but not at 13,999 kHz then
PowerSDR commands the radio to use 13,999kHz for the VFO frequency but then
changes the IF to 10kHz. Now 14,009kHz
- 13,999 kHz = 10kHz.

So, in short, PowerSDR changes both the VFO frequency and the IF frequency
behind the scenes so that the spurs do not show up. Pretty clever those
Flexians.

 What got me thinking about this is the fact that CW Skimmer wants this 
 to be turned off. I can see that Skimmer sees things differently with 
 it on or off, but I don't know why that is.

It is because of the magic hand-waving above. CW Skimmer always uses the
same IF so the DDS VFO *must* produce the expected frequency or the
frequency calculated in CW Skimmer would be incorrect.

 Also - is this something that has to do with receive only?

No, this is done for transmit as well.

 What's really on my mind is - when I stop using Skimmer is it very 
 important that I turn SR back on?

Yes. It not only avoids spurs but it makes tuning much faster because
PowerSDR doesn't need to change the frequency of the VFO for every 1Hz of
frequency change.

--
73 de Brian, WB6RQN/J79BPL


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Re: [Flexradio] SR button

2010-01-13 Thread Michael Jones
On other thing then - since this is critical for good transmitter
performance - am I running the risk of transmitting spurs when I have
Skimmer turned on and SR turned off? Is there a solution to that if it is a
problem?


Best regards,

Michael Jones
SCSI Toolbox LLC
www.scsitoolbox.com
303-972-2072


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Re: [Flexradio] SR button

2010-01-13 Thread Brian Lloyd
On Wed, Jan 13, 2010 at 11:48 AM, Michael Jones mi...@scsitoolbox.com wrote:
 On other thing then - since this is critical for good transmitter
 performance - am I running the risk of transmitting spurs when I have
 Skimmer turned on and SR turned off? Is there a solution to that if it is a
 problem?

That is something that they guys from Flex are going to have to answer.

-- 
73 de Brian, WB6RQN/J79BPL

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Re: [Flexradio] SR button

2010-01-13 Thread Tim Ellison
There shouldn't be any DDS spurs in the CW portion of all the ham bands.  This 
was a very significant problem with the SDR-1000 and essentially fixed with the 
FLEX-5000/3000.

In the past 5 years, I have never heard of anyone having issues on TX due to a 
DDS spur; even with the SDR-1000 where some bands looked like grass growing in 
a pasture. 


-Tim

-Original Message-
From: flexradio-boun...@flex-radio.biz 
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Brian Lloyd
Sent: Wednesday, January 13, 2010 5:38 PM
To: mi...@scsitoolbox.com
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] SR button

On Wed, Jan 13, 2010 at 11:48 AM, Michael Jones mi...@scsitoolbox.com wrote:
 On other thing then - since this is critical for good transmitter 
 performance - am I running the risk of transmitting spurs when I have 
 Skimmer turned on and SR turned off? Is there a solution to that if it 
 is a problem?

That is something that they guys from Flex are going to have to answer.

--
73 de Brian, WB6RQN/J79BPL

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