The ARRL publication: Experimental Methods in RF Design by Wes
Hayward, W7ZOI, Rick Campbell, KK7B, and Bob Larkin, W7PUA answers a lot
of these questions plus chapter 10 deals very well with DSP. Also, Doug
Smith's book Digital Signal Processing Technology is another excellent
ARRL
Dave,
I think Hayward's book covers everything you suggested, except
PowerSDR. Take a look for yourself.
Tom
Dave Gomberg wrote:
At 08:38 PM 8/1/2009, Tom Thompson wrote:
The ARRL publication: Experimental Methods in RF Design by Wes
Hayward, W7ZOI, Rick Campbell, KK7B, and Bob Larkin
Hey Brian,
How about an Inverter from Radio Shack and run the Mac power supply from
120 VAC converted from 12 VDC.
Tom W0IVJ
Brian Lloyd wrote:
OK. You guys know I am am an Apple Fanboi. I will be using my MacBook
Pro to run the Flex for Field Day. But I need a way to power it from
12V as
With high SWR the losses can easily be determined by TLW found on the CD
in the ARRL Antenna Book. The loss can be different depending on
whether the SWR is caused by a low resistance or a high resistance
because at HF the losss are largely IR due to the resistive part of the
load. At the
I have two homebrew, solid state amps with no alc. The big amp (1kW)
has no protection, uses MRF 154s, and takes 15 watts to drive to full
power. I have accidently driven it with 100 W with no damage. The
small amp (600 W) uses 4 MRF 150s in parallel pushpull. I built over
drive
There is a freeware program that will do a timed shutdown. I have it
restart my computer. You can set an alarm before the time out pereiod
is up. When the alarm goes, abort and restart the application. I have
used it when running remote. It can be found at
homebrew telephone remote of my TS-450, the hangup
signal does a hardware reset and turns everything off including the AC
to the power supply.
Tom
Jim Lux wrote:
At 04:23 PM 7/17/2008, Tom Thompson wrote:
There is a freeware program that will do a timed shutdown. I have it
restart my
k5nwa wrote:
At 07:30 PM 7/11/2008, you wrote:
If your going to run those tests how about biasing to class A and
measure What the heck you might as well blow the competition
completely out of the water while your at it.
73 W9OY
Curious, was the amplifier designed so it could
Hi Jeff,
I do not have a 5000, but it sounds as if you can set the bias on the PA
transistors with software. If that is the case, have you checked that
the quiescent current is really what it is supposed to be for the
transistors that are in the PA. If you have more distortion at lower
Lee,
Would you place your VOM across the key while plugged into the 5000 and
measure the current that would normally be flowing through the key when
it is closed? On my 1000 the current is about 5 mA and on my IC-7000 it
is about 200 uA. I placed a NPN across the keying circuit on the 1000
Hi Guys,
I have been following this thread with some interest because I
occasionally experience this problem with the SDR-1000. Since the
problem seems not to occur on the IC-7000, I made a couple of
measurements. I have my paddles connected through the key port on the
SDR and not through
Hi,
Modern rigs all have several lowpass filters in line that are switched
according to which band you are using. Solid state linear amplifiers do
the same. Your tube amplifiers generally use a Pi-L network as a
matching device to the antenna, so I don't think a lowpass filter is
needed
really do appreciate you explanation
and confirmation, as well as the time you took to clear the air with it.
David
KD4NUE
-Original Message-
From: Tom Thompson [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 10, 2008 11:30 PM
To: David Little
Cc: flexradio@flex-radio.biz
Subject: Re
David,
As I understand the SDR mic input, the mic slider is a software scaler.
It does not effect the input to the sound card. The higher the mic gain
on the SDR has to be in order to get a given power output, the worse the
signal to noise of the Delta 44 will be. In order to get the full
Lee A Crocker wrote:
I had this happen yesterday. I was listening on 7001.5 for Antarctica and a
few dozen hz down the band was a spur from some electrical noiseI was
wishing for a sharp manually tunable notch that I could sneak up from below
and give that carrier hell. If I turned on
[EMAIL PROTECTED] wrote:
Last week I posted this message;
I received my new 5000 on Wednesday and finally got it operating today.
Everything is running great except for a problem I have with my headphones.
While listening with my Heil Proset Quiet Phones the audio sounds good in
the left
Steve Kallal wrote:
I've been playing with the Window selection on the DSP setup screen. I
really can't tell any on the air difference between them in receive. There
are very slight differences in the display. From past searches, I've noticed
comments about differences in reception. In laymen's
Is it just a coincedence that the ascii value for A is 41 in hex.
Tom W0IVJ
It looks like the long messages (aside from simple note on/off) are
using a standard SysEx type structure. You've got a manufacturer
code of 00 00 41, which one source gives as Microsoft, but the MMA
says
Dan,
This is very interesting. It occurred to me that we can now take the CB
roger beep and put it to good use grin
Tom W0IVJ
Tayloe Dan-P26412 wrote:
Diversity reception reduces resistance to fades. For this, we try to
space our cell site antenna 10 wavelengths apart in order to
Jim,
As you are thinking about this, take another look at John (K2OX)
Eckert's work at
http://www.exothink.com/SDR/
His measurements might shed some light on the discussion.
Tom W0IVJ
Jim Lux wrote:
At 07:39 PM 10/6/2007, Gerald Youngblood wrote:
Phil, I am afraid your jitter specs
Tom Thompson wrote:
Bob,
In April you wrote the following:
We use Blackman-Harris windows for all the right reasons as the window
in the filter design. We care about the ultimate out of band rejection,
and this can only be accomplished by a (VERY SMALL) sacrifice in shape
factor
the VFO display) and dBm amplitudes (from the
s-meter). Then do your calculations. It's a bit time-intensive, but I
believe it will produce accurate results.
Dale
WA8SRA
Tom Thompson wrote:
Tom Thompson wrote:
Bob,
In April you wrote the following:
We use Blackman-Harris
Tom Thompson wrote:
Dale,
Thanks for the reply. Yes, that occured to me and I actually set up
a tone and tuned across it and did that. I thought Bob was
describing a way in which one could actually see the filter shape by
using noise, much like you could view a filter by exciting
at it and then asked. That is my
description of the optimal use of this group.
Bob
N4HY
Tom Thompson wrote:
Dale,
DUHH, I guess I need to learn how to read. I read spectrum,
tanslated it in my mind as spectrum analyzer, and promptly set up the
pan adapter. Thanks for your patience. Bob, please
It just occured to me that the way to do this is to condition the amp
ALC and sum it with the analog voltage that comes out of the SWR
bridge. The SDR will then fold back with either high SWR or high ALC.
I believe the ALC voltage out of most amps is negative, so it would take
an op amp to
Ray,
You are exactly right. With 2 op amps in an 8-pin dip and 4 in a 14-pin
dip, I have gotten lazy :)
73 Tom W0IVJ
Ray Andrews, K9DUR wrote:
Tom,
Actually, it could be done with a single op-amp. Feed one signal into the
- input of the op-amp feed the other signal into the + input you
would be helpful. Maybe it could be placed in the
knowledge base for reference.
Jerry W4UK
At 07:15 PM 7/18/2007, Tom Thompson wrote:
On my SDR-1000, I am using one of the open collector outputs to key
the amp. If you AND a good ALC signal with that open collector
output and use the ANDed
,
then the exciter cuts back the power after the amplifier faults and
takes itself out of the line. My amplifier also faults with over drive
and over temperature. It really should be the amplifier that handles
these conditions, so that the amplifier can be used with a variety of
exciters.
Tom Thompson
this, and the amp can use that to command a
cutback. But if the exciter has no hardware ALC (like Flex-radio
products), then what?
Incidentally, all the non-Flex exciters that I am personally familiar
with have hardware ALC.
Jerry W4UK
At 05:21 PM 7/18/2007, Tom Thompson wrote
I am a little confused on this issue, also. If the QSD does not need
roofing filters, why was there a 160 meter filter as described below?
Jeff et all, the filter that is supplied with a new Flex Radio is a low
pass filter. It does not attenuate broadcast band signals. There is a
problem with
W0IVJ
Jim Lux wrote:
At 04:22 PM 3/24/2007, Tom Thompson wrote:
Hi RJ
I have had things like that happen when the data base gets corrupted.
Over the past year or so, this concept of database corruption seems
to crop up occasionally. What's causing the corruption? Is it worth
trying
Systems
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
radio.biz] On Behalf Of Jim Lux
Sent: Saturday, March 24, 2007 11:50 PM
To: Tom Thompson; RJ Harris - W3HP
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Help!
At 04:22 PM 3/24/2007, Tom Thompson wrote
has that does not occur with the multiple
clamp.
73 Tom W0IVJ
Charles Greene wrote:
That sounds like a good EMI filter. Wouldn't a F-140-43 core be
better? (more turns, and better performance at HF? I don't know,
just asking).
C
At 10:19 AM 3/7/2007, Tom Thompson wrote
performance at HF? I don't know,
just asking).
C
At 10:19 AM 3/7/2007, Tom Thompson wrote:
Charles,
Get an FT-114-77 ferrite toroid from Palomar Engineering and wrap as
many turns of the USB cable as you can on the core.
Tom W0IVJ
Charles Greene wrote:
Hi,
I
Charles,
Get an FT-114-77 ferrite toroid from Palomar Engineering and wrap as
many turns of the USB cable as you can on the core.
Tom W0IVJ
Charles Greene wrote:
Hi,
I am getting some RF feedback when I use a Linear amp that causes the
USB to Parallel connection to occasionally
If you are a open wire feeders are best sort of guy, good luck... The
reason open wire feeders are zero loss is that the feeders themselves
radiate.
The reason open wire feeders radiate is because the current in the two wires
are unbalanced. If you balance the currents, the loss remains
Jeff and Jim,
The lines will not radiate if they are balanced, but Jim is correct in
stating that it is difficult to maintain balance in open wire feeders.
Ideally, the feeder would run perpindicular to the dipole which would be
out in the open from other objects. Also, the open wire feeders
Charles Greene wrote:
That sounds like a good EMI filter. Wouldn't a F-140-43 core be
better? (more turns, and better performance at HF? I don't know,
just asking).
C
At 10:19 AM 3/7/2007, Tom Thompson wrote:
Charles,
Get an FT-114-77 ferrite toroid from Palomar Engineering and wrap
and then hit split. Now my A
is receive (default tuning) and by B is transmitting on what should be
a clear frequency.
73,
Dan
Tom Thompson wrote:
John,
I noticed that when working split that the TUNE function uses the VFO
A frequency. Since the transmitter uses VFO B, shouldn't the TUNE
John,
I noticed that when working split that the TUNE function uses the VFO A
frequency. Since the transmitter uses VFO B, shouldn't the TUNE
function use VFO B?
73 Tom W0IVJ
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John,
I noticed that when working split that the TUNE function uses the VFO A
frequency. Since the transmitter uses VFO B, shouldn't the TUNE
function use VFO B?
73 Tom W0IVJ
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Dana,
The question of sensitivity still remains as far as I can tell. Can you
borrow an attenuator and bring the XG1 down to the noise floor on both
yours and Joe's radio. The 10 dbm difference may be a calibration
issue rather than a sensitivity issue unless you can still hear signals
on
Jim Lux wrote:
At 11:16 AM 2/24/2007, Paul Shaffer wrote:
I don't think Flex has stated their position as clearly as they could. My
impression is that they would love to have a cross-platform solution
available now that would suit everyone. The problem has to be the cost. If
Flex does this
Mark and Bill,
I made some measurements and got similar results as Mark. The one thing
that confused me was the difference in shape factor between the narrow
filters and the wide filters, but I think you just cleared that up for
me, Bill. It has to be a function of the bin resolution and the
again so that the signal was 60 db down. If I divided the 6 db bandpass
by the 60 db bandpass, the number was about 1.1. If I followed the same
proceedure with the filter set to 100 Hz , the number was 2.7. What
causes the difference?
Tom W0IVJ
Jim Lux wrote:
At 08:18 AM 2/18/2007, Tom
Mark,
You may have already tried this, but if you haven't, connect your SDR to
a dummy load and then to the antenna and determine what the increase in
noise is. Do the same for the FT-1000MP and see if the relative
increase is the same. Also, if you have an antenna tuner, preferably a
High
Bob,
If you push the wheel in, it will change the tuning increment.
Probably, in your enthusiasm to turn it fast, you are also pushing it in.
Tom W0IVJ
Robert Cleve wrote:
I just installed a new M.S. Optical mouse and Intellipoint software that
came with it on the PC I normally use with my
Peter,
100/90 = 1.
10 * Log 1. = 0.458 db
at 6 db / s-unit = 0.458 / 6 = 0.076 s-units.
73 Tom W0IVJ
[EMAIL PROTECTED] wrote:
Dear OM's
How many S-points are gained going from 90watt to 100watt ???
:-)
73
groeten Peter
petervn(a)hetnet.nl mailto:[EMAIL PROTECTED]
(a)amsat.org .
Van: Tom Thompson [mailto:[EMAIL PROTECTED]
Verzonden: di 6-2-2007 22:49
Aan: [EMAIL PROTECTED]
CC: Larry Taft; Eric Wachsmann; FlexRadio
Onderwerp: Re: [Flexradio] PA calibration routine
Peter,
100
Jeff,
I had that happen to me, also. I could not find the culprit using the
task manager, so I ran MSCONFIG under the run command and rebooted with
a minimum configuration, i.e. most of the auto starting applications
were not loaded. The problem went away, so I again tried to find the
Jeff,
Try running MSCONFIG in the Diagnostic Startup mode.
Tom W0IVJ
Jeff Anderson wrote:
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
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
, 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
Eric,
I don't too much about this, but it seems to me since Windows is not a
real time operating system, that some process is stealing interrupts and
not letting the SDR-1000 have the machine. Didn't someone report a
network card doing this a while back?
Tom W0IVJ
FlexRadio - Eric wrote:
I have to agree with Tim. After typing in the Flex URL into my browser,
I was reading the pdf file with 4 clicks and typing keyboard
commands. That is pretty easy.
Tom W0IVJ
Tim Ellison wrote:
Ken,
No offense taken, but I don't see where you can make an assessment such
as usability is
in the main and sub receivers be identical enough to make this
a noise canceling device?
Thanks,
Tom Thompson W0IVJ
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Archive Link: http
[EMAIL PROTECTED] wrote:
I have, reluctantly, concluded that my SDR 1000, except for repairs and
ECOs, will never again leave my base station. Period.
It just isn't a very good idea.
The problem is the Rosanne Rosannadanna effect -- It's always
something. Disturbing the cabling on the
KD5NWA wrote:
Joe - AB1DO wrote:
Thank you!
When I click on the link, the audio immediately starts streaming. I would
rather save the file to disk first and then play it. Anyone know how to do
that?
Thanks
73 de Joe - AB1DO
I have never understood the idea of giving out a link to a
Scott T wrote:
Hello,
I am new to Flex, and am having a problem on transmit. I seem to be putting
out a signal on both lower and upper sideband at the same time, while just
one sideband mode is selected. Any suggestions would be greatly
appreciated!
73,
Scotty
N6EDV
-- next
Jim Lux wrote:
Just a test..
Jim, W6RMK
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875
Ed,
I have had my SteppIR running with the SDR-1000 for some time. I plug
the SteppIR cable into COM1 and set the SteppIR box for Kenwood
operation at 9600 baud. I then set the SDR-1000 CAT up for TS-2000 on
COM1 at 9600 baud. I set parity to none, data bits to 8 and stop bits
to 1. It
Kevin,
The Altec Lansing VS2220 speakers are good and seem to be RFI immune.
Tom W0IVJ
Kevin Hobbs wrote:
Hi All;
I would like to thank everyone for their expertise and suggestions in trying
to help me get my SDR running. It is great to get support!
For those who care . here is where
Build a simple crystal or LC oscillator fom the ARRL handbook.
Tom Thompson W0IVJ
Jim Lux wrote:
At 12:02 PM 9/14/2006, Tim Ellison wrote:
Eric said:
No typo here. It is useful to have a stronger signal than -73dBm when
doing the image calibration.
So anyone have a good recommendation
José,
I experienced a similar problem with SVN 652 , and I found that under
Setup-Options my X2 delay was set to 1000 ms.
I hope this helps.
73 Tom WØIVJ
José Dumoulin wrote:
Hi Friends
I am using SVN 653. When clicking mox or pressing the PTT, I note a
certain latency before the relay
Jerry,
The ALC on an amplifier is a feedback path from the amp to the exciter
that holds the amp output to a certain level by reducing the exciter
output and thus the drive to the amp. ALC will not protect the amp
from a high SWR condition. Most amps these days have over drive
protection
Hi Joe,
I didn't see any replies to your question, so I thought I'd comment. I
do not think the open collector driver on X2 will be damaged if it has
13.8 v on its collector while the SDR is powered off provided the SDR
and the 13.8 v source share a common ground. There will be no base
I, also, use Jeff's console exclusively, and am pleased to here the good
news.
State of the art ? Hummm... I think Jeff is being very straightforward
about all this. He designed the interface for his own personal use. It is
not a fully windows compliant interface. Flex needs to be very carful
Bill,
The peak current should be equal to the steady state current at 100
watts. At 13.8 volts and 100 watts the current is about 7 amps. If you
figure the efficiency at about 50% that would be about 14 amps. My
Astron current meter measured it at 10 amps so, either the efficiency is
Brian,
I tried several, but the one that worked the best (no RFI because no
wallwart) were the Altec Lansing VS2220.
73 Tom W0IVJ
John Basilotto wrote:
I actually use my Pansonic SA-AK22 CD stereo system. I plug the output from
my D44 sound card into the AUX jack and have incredible
] Behalf Of Tom Thompson
Sent: Tuesday, June 27, 2006 5:33 PM
To: Robert McGwier
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] audio pop
Bob,
I downloaded 1.6.3 svn 560 and the pop is gone with the dma buffer set
to 2048, the audio buffer to 1024, and the dsp buffer to 2048
or two we need to remove!
Bob
Tom Thompson wrote:
Bob,
I am using the Delta 44 card with the buffer size on the audio tab
set to 2048. The sampling rate is 96000 and the manual latency is
unchecked. My dsp buffer is 2048. I found that on the new release
that if I decrease
Bob and Eric,
Under careful scrutiny, the pop is there with the new release with
settings of 48000 and 2048, but it is reduced. I think that it is so
fast that the 48000 sampling rate does not catch it all the time or at
least at as great an amplitude.
Tom
Tom Thompson wrote:
Bob and Eric
Sergey is correct.
Settings:
Card: Delta 44
DMA buffer: 2048
Audio Buffer: 2048
Sample rate: 96000
X2 Delay: 30 60
Result: No Pop Pop
Tom W0IVJ
Sergey Abramov wrote:
Hi,All.
My observations (svn 560)
1. Buffer Delta 44 - does not give change for audio pop.
OOPS,
DSP Buffer: 2048
Tom
Tom Thompson wrote:
Sergey is correct.
Settings:
Card: Delta 44
DMA buffer: 2048
Audio Buffer: 2048
Sample rate: 96000
X2 Delay: 30 60
Result: No Pop Pop
Tom W0IVJ
Sergey Abramov wrote:
Hi,All.
My observations (svn 560)
1
() :-)
73
Frank
AB2KT
Tom Thompson wrote:
Bob and Eric,
Under careful scrutiny, the pop is there with the new release with
settings of 48000 and 2048, but it is reduced. I think that it is so
fast that the 48000 sampling rate does not catch it all the time or at
least at as great an amplitude.
Tom
on this.
73, Tom W0IVJ
Robert McGwier wrote:
Please let me know if the code I checked in fixed the problem. Thanks
for the hint Frank.
Bob
Tom Thompson wrote:
The X2 delay is certainly the key. My svn 537 that was working had
the X2 delay set to zero. When I set it to a larger
mentioned this bug, not only was there discussion from hams
all over the world, but there was a fix to download. Hell, you can't
even get through to most help desks in that amount of time, much less
get a fix! Keep up the good work.
Tom W0IVJ
Tom Thompson wrote:
Bob,
I downloaded 1.6.3
Lee,
Is there a problem with creating IMD products withe the 1N4007's at the
input of the receiver, or are they too slow to cause a problem?
73, Tom W0IVJ
Lee A Crocker wrote:
I reviewed the K-2 100W PA diode switching circuit.
It's a very clever idea, but it still would be quite
Eric,
In SVN 531 the S-meter will not return as an S-meter after pushing the
MOX button. It stays in the ALC mode.
Tom W0IVJ
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://www.itsco.com )
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Thompson
Sent: Sunday, June 18, 2006 7:51 PM
To: FlexRadio - Eric
Cc: FlexRadio@flex-radio.biz
Subject: [Flexradio] SVN 531 meter problem
Eric,
In SVN 531 the S-meter will not return as an S-meter
Personally, I agree with Bob. Having been a ham for 50+ years and an
engineer for almost 40, I have always felt cheated when I left my lab at
work where a measurement meant something and hooked my various receivers
up to the same antenna and got drastically different readings. Art
Collins
John,
QRZ.com has his address listed as [EMAIL PROTECTED] .
73 Tom W0IVJ
John Basilotto wrote:
I'm trying to reach Harold Bissonett KD5RD and would appreciate contact
info. I cant seem to get through on email.Kd5rd
John P. Basilotto
W5GI
Marketing and Product Manager
FlexRadio Systems
on the internet side. That might make a nice easy
interface for a lot of devices. I believe some of the Remote guys are
using something like this as I recall from a QST article some time ago.
73 Tom W0IVJ
Jim Lux wrote:
At 07:08 AM 6/6/2006, Tom Thompson wrote:
Joe,
When you order the SteppIR
Hi Joe,
The SDR-1000 can definitely be interfaced with the 3-el SteppIR.
73 Tom W0IVJ
Joe - AB1DO wrote:
Hi all,
I know this has come up before, but I couldn't find it in the searchable
archive. So apologies in advance.
I am considering purchasing a 3 el steppir and was wondering if the
Hi Joe,
The SteppIR control box needs a hard serial connection from the
transceiver for control. I connected the SteppIR to a hard serial port
in the computer and then configured the CAT in the SDR to look like a
Kenwood at 9600 baud using the COM port that I had the SteppIR control
box
Richard,
I have had the same problem. I found a free timer that will reboot your
computer at time out. I set it for 10 minutes and if I knock myself off
the internet, the computer just reboots which restores control and you
can then reset the SDR1000. The url is:
Jeff,
Occasionally I have been transmitting SSB but what comes out is DSB.
This can be cured by reseating the 3.5 mm connectors on the SDR. This
may be causing your intermittent CW problem.
Tom W0IVJ
Jeff Anderson wrote:
I recently came across a CW Transmit problem while running the
Stan,
I have used several amplified speakers with the SDR1000. Most have
required ferrite cores (F114-77 from Palomar or Bytemark) on the power
and signal leads to get rid of the RF when using high power. Currently
I am using the Altec Lansing VS2220 speakers available from Office Max
for
Jeff,
I think your console is superb. It is easy to use and is well
engineered, especially from the human interface standpoint. It is my
default console at this point. Considering that you are a hardware
engineer, you have come a long way in the software field.
You have indicated that
Bob,
Since I hear Linux pronounced L-eye-nux and L-i-nux, I want to get off
on the right foot :) How do you pronounce the African word Ubuntu?
Tom Thompson W0IVJ
Robert McGwier wrote:
w2agn wrote:
I see all the Linux discussion, which is interesting. I run both Linux
and Win2000
Hi Dan,
Don't cancel your order. What I understand from Gerald is that he is trying to
hit a happy medium between the tinkerers and the users. I have heard several
people who have read the reflector say that the radio has too many bugs for
them. I think the open discussion on the reflector
Hi Brian,
Welcome to this most interesting adventure. I am glad to have you
aboard. This is one journey where the trip is everything since no one
knows where we are going. Enjoy.
73,
Tom W0IVJ
Brian Sherrod wrote:
Hello All,
I am a new member of this reflector and soon to be a
Bill,
I had some RFI problems that I cured by wrapping the lines going into
the SDR box around an F117-77 core using it as a common mode choke.
Larry's solution is easier, so I would try it first. Also, I have found
that the 3.5 mm connectors will cause an echo if not seated correctly.
73,
Brian,
I have that occasionally, and reseating the 3.5 mm connectors on the SDR
cures it.
Tom W0IVJ
Brian Fredrickson wrote:
I have recently been receiving reports of a slight echo on my tx
signal. I can reduce the problem by turning off the leveler and winding
back the microphone
is not a real time operating system
multiple buffers may have to be used to compensate for Windows is off
doing something else.
Tom ThompsonW0IVJ
Lee A Crocker wrote:
I perceive the variability in TR as well. I think the
way to think of this is to not consider QSK. The way
to think
Mike wrote:
Fellow SDR users,
Here is a little quirk that popped up which you may file for future
reference if needed. Coincidently after installing ver15, I began having
no transmit audio on 10 m, and only distorted audio output on 15 meters.
Also only intermittent rx on those two bands,
Ken Klein wrote:
Eric and others;
Well, I have one other really interesting thing to report vis a vis my
radio. With the SDR, 40 meters, as well as everything else including a.m.,
is all but dead. I hooked up a SoftRock V5.0, changing only the Line In
cable from the SDR to the SoftRock and
. The beagle then takes all
those email addresses and uses them.
Sigh. . . .
Bob
Tom Thompson wrote:
Hello,
My email address has been associated with the [EMAIL PROTECTED] virus
on the reflector. Currently I am in Costa Rica, but I was able to
connect to my home computer via VNC. I
machine. My only conclusion is that my email address has been
spoofed. If anyone has any ideas, I am open.
73, Tom Thompson W0IVJ
Tom Thompson wrote:
Kurt,
Sound cards are just begging for RF interference. They have high
impedance inputs and high gain, and as a result, they are subject to
fundamental overload. I have used F114-77 toroid cores from
http://palomar-engineers.com extensively on my Delta 44 leads
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