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 AFC in
MMTTY will lock on to your xmit audio freq. When switching back to
receive, the AFC will take a second or so to lock back the the signal you
want to copy. Is this what you are observing? Is it the same offset each
time? Can you move the offset be changing the setting in MMTTY?
I just looked at one of my soundcards a SB-16 (ISA). It is set for a
calibrated clock of 8002 Hz. Not the standard 8kHz. I always calibrate and
adjust the soundcards based on WWV. (Software is built into MMTTY).
Good luck and keep asking --- de Jerry NO2T
At 12:33 PM 1/1/2007 -0700, you wrote:
>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
>symptoms, whatever the ultimate fix might be.
>
>Brian K7RE
>Jim Lux wrote:
>
>> 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) wirewrap wire and wrap
>> it around the pin to capacitively couple it off.
>>
>> If the 200 MHz stays fixed, then you know that there's something else
>> going on.
>>
>> 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 Homepage: http://www.flex-radio.com
>
_______________________________________________
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 Homepage: http://www.flex-radio.com
