Folks:
I have finally been able to completely eliminate the short term
frequency drift of 20 -30 Hz. when returning to RX after transmitting
for just a few seconds. In the last few weeks I have operated several
digital contests, and am happy to report that there is no measurable
drift as
I hooked up MixW <--> VAC <--> vCOM <--> FA-66 and everything in PSK31,
Olivia, and MFSK16 work without any shift in frequency. I will continue
to test.
de ken
Brian Kassel wrote:
> Hello Peter:
>
> I have never heard or worked with this device, so your explanation
> really helped me understa
OTECTED]> ;
> pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org .
>
> ----
> Van: Willi Reppel [mailto:[EMAIL PROTECTED]
> Verzonden: zo 7-1-2007 11:48
> Aan: [EMAIL PROTECTED]; Brian Kassel; flexradio@flex-radio.biz
&
6OMH Willi
>
>- Original Message -
>From: <[EMAIL PROTECTED]>
>To: "Brian Kassel" <[EMAIL PROTECTED]>;
>Sent: Saturday, January 06, 2007 11:09 PM
>Subject: Re: [Flexradio] More Strange Frequency Drift Problem
>
>
> >I am not sure where the p
SM6OMH Willi
>
> - Original Message - From: <[EMAIL PROTECTED]>
> To: "Brian Kassel" <[EMAIL PROTECTED]>;
> Sent: Saturday, January 06, 2007 11:09 PM
> Subject: Re: [Flexradio] More Strange Frequency Drift Problem
>
>
>> I am not sure w
PROTECTED]> ;
pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org .
Van: Willi Reppel [mailto:[EMAIL PROTECTED]
Verzonden: zo 7-1-2007 11:48
Aan: [EMAIL PROTECTED]; Brian Kassel; flexradio@flex-radio.biz
Onderwerp: Re: [Flexradio] More Strange Frequency Drift Problem
rian Kassel" <[EMAIL PROTECTED]>;
Sent: Saturday, January 06, 2007 11:09 PM
Subject: Re: [Flexradio] More Strange Frequency Drift Problem
>I am not sure where the power for the heater on the 200MHz oscilator come
>from
>
> power to the 200MHz oscilator:
> PIOboard [AVD
Hello Ahti :
I didn't realize that the thermister was powered directly from the
raw DC input. I am using a commercial power supply, an SEC 1223
switcher. The drift is the same regardless of TX power levels, even
down at the 5 Watt level. Wouldn't the drift be more severe at the
highe
Brian,
This is just my guess:
The thermistor heating the oscillator takes its power directly from
the 13.8 V source. Switching from RX to TX will change the total
current and possibly causes a minor voltage change. That would disturb
shortly the temperature equilibrium of the thermistor/oscillato
07 22:16
Aan: flexradio@flex-radio.biz
Onderwerp: Re: [Flexradio] More Strange Frequency Drift Problem
Folks:
Can someone tell me where the regulated voltage for the 200 MHz.
oscillator comes from? It isn't clear to me in the schematic. I am
investigating a 22 HZ oscillator frequency cha
Folks:
Can someone tell me where the regulated voltage for the 200 MHz.
oscillator comes from? It isn't clear to me in the schematic. I am
investigating a 22 HZ oscillator frequency change from TX to RX that
occurs in the first 10 seconds, then stabilizes to less than 1 Hz
change. . Temp
DZ
Cc: flexradio@flex-radio.biz; [EMAIL PROTECTED]; Jim Lux
Subject: Re: [Flexradio] More Strange Frequency Drift Problem
Hi Maarten:
Thanks for the information. More and more it is looking like a
hardware problem, but hopefully it will be easy to solve. Tomorrow I
will attempt to measure the 20
Hi Maarten:
Thanks for the information. More and more it is looking like a
hardware problem, but hopefully it will be easy to solve. Tomorrow I
will attempt to measure the 200 MHz. oscillator frequency. Got to be
getting pretty close to the culprit that is causing the short term drift.
B
The same drift you described I encountered once in my 2m transverter.
I had stabilized the transverter with a thermistor soldered to the crystal.
Everytime I transmitted the voltage would sag a little causing a
temparature change that caused the oscilator to drift a little.
It would only occur in
Brian
Just remembered something. Sound card out and in ports may not be on the
same frequency! Had this problem years ago when doing SSTV. MMTTY has in
the "MISC" Tab the ability to correct for "TX Offset" in HZ.
If one operates using AFSK, and monitoring your xmit signal, the A
Hi Jim:
This is an excellent idea. I actually thought of it, but without a
schematic, I was a little hesitant to open the case and probe around.
I'll open up the cabinet and try it tomorrow. I'll let the reflector
know what I find too, Someday, someone else just may experience these
sym
At 08:06 PM 12/31/2006, Brian Kassel wrote:
Have you tried using your frequency counter to count the 200 MHz
reference oscillator. A small loop of wire near the DDS should pick
it up. As I recall, there's some jumper pins that carry the 200 MHz,
so you could take a small piece of (insulated) w
From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Brian Kassel
>> Sent: Sunday, December 31, 2006 10:35 AM
>> To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
>> Subject: [Flexradio] More Strange Frequency Drift Problem
>>
>> Folks:
>>
>&g
;From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] On Behalf Of Brian Kassel
>Sent: Sunday, December 31, 2006 10:35 AM
>To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
>Subject: [Flexradio] More Strange Frequency Drift Problem
>
>Folks:
>
> I have been told that with t
Brian Kassel wrote:
> Hi Larry:
>
> Thanks for your message and suggestions. I changed out the PS with
> another SEC 22 A version, and the symptoms persist. Please keep in
> mind that the symptoms also persist when running only 5W. I do
> appreciate the input as to the fact that a heavie
Hi Larry:
Thanks for your message and suggestions. I changed out the PS with
another SEC 22 A version, and the symptoms persist. Please keep in mind
that the symptoms also persist when running only 5W. I do appreciate
the input as to the fact that a heavier PS is required than the typic
Brian Kassel wrote:
>Hi Jim:
>
>Thanks for the note. Let's see if I can describe to you what I
>see. After even a short transmission of, say, 5 seconds, running
>something like 5W, the frequency of the received PSK-31 signal slowly
>moves to the left on the waterfall display of my MixW pr
>
>
>
> Van: [EMAIL PROTECTED] namens Jim Lux
> Verzonden: zo 31-12-2006 22:18
> Aan: Brian Kassel; Ross Stenberg
> CC: [EMAIL PROTECTED]; flexradio@flex-radio.biz
> Onderwerp: Re: [Flexradio] More
Hi Jim:
Thanks for the note. Let's see if I can describe to you what I
see. After even a short transmission of, say, 5 seconds, running
something like 5W, the frequency of the received PSK-31 signal slowly
moves to the left on the waterfall display of my MixW program traveling
about the
bject: [Flexradio] More Strange Frequency Drift Problem
Folks:
I have been told that with the newer SDR's (mine is only a few weeks old),
no turn on drift should be experienced with the thermistor modification.
However I see drift of probably 100 HZ or so immediately after turn on, for
about
Van: [EMAIL PROTECTED] namens Jim Lux
Verzonden: zo 31-12-2006 22:18
Aan: Brian Kassel; Ross Stenberg
CC: [EMAIL PROTECTED]; flexradio@flex-radio.biz
Onderwerp: Re: [Flexradio] More Strange Frequency Drift Problem
At 12:22 PM 12/31/2006, Brian Kassel wrote:
>Hi Ross:
>
> As I had m
At 12:22 PM 12/31/2006, Brian Kassel wrote:
>Hi Ross:
>
> As I had mentioned in 2 messages to Tim:
>
> "I also got a reply from Ken, N9VV. He basically agrees with you, and
>I gladly accept the turn on drift, no problem. I stand informed and
>educated by you both, thanks!
>
>What does bo
>>www.itsco.com
>>
>>"Si fractum non sit, id reficere"
>>-Unknown Roman consultant
>>
>>-----Original Message-
>>From: [EMAIL PROTECTED]
>>[mailto:[EMAIL PROTECTED] On Behalf Of Brian Kassel
>>Sent: Sunday, December 31, 2006 1:
"Si fractum non sit, id reficere"
>-Unknown Roman consultant
>
>-Original Message-
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] On Behalf Of Brian Kassel
>Sent: Sunday, December 31, 2006 1:35 PM
>To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
>Subjec
here could be a problem.
73 Ross K9COX
- Original Message -
From: "Tim Ellison" <[EMAIL PROTECTED]>
To: "Brian Kassel" <[EMAIL PROTECTED]>; ;
<[EMAIL PROTECTED]>
Sent: Sunday, December 31, 2006 1:19 PM
Subject: Re: [Flexradio] More Strange Frequen
2006 1:35 PM
To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
Subject: [Flexradio] More Strange Frequency Drift Problem
Folks:
I have been told that with the newer SDR's (mine is only a few weeks
old), no turn on drift should be experienced with the thermistor
modification. However I see drift of p
Folks:
I have been told that with the newer SDR's (mine is only a few weeks old), no
turn on drift should be experienced with the thermistor modification. However
I see drift of probably 100 HZ or so immediately after turn on, for about 10
minutes or so. I have the feeling that the thermist
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