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Re: Re: [amsat-bb] Re: [amsat-bb] D700 TNC Calibrate mode etc (II)



Danny,
I suspect you have a timing problem, look at the demodulated wave form and 
look for jitter in the decoded data. I stroage scope is extreamly usefull 
for doing this. I will look around for some articals I may have.

Art,
KC6UQH
----- Original Message ----- 
From: "Danny Jacobs" <jacobs@physics.montana.edu>
To: "kc6uqh" <kc6uqh@cox.net>; <amsat-bb@amsat.org>
Sent: Sunday, June 04, 2006 5:56 PM
Subject: [amsat-bb] Re: [amsat-bb] Re: [amsat-bb] D700 TNC Calibrate mode 
etc (II)


>   Thanks for the answer about the frequency deviation. At least one
>   parameter is getting nailed down.
>   After a quick search I find that as of March 06 none of the past
>   journal articles are online
>   (http://www.amsat.org/amsat/archive/amsat-bb/200603/msg00093.html) but
>   I can buy some of them on CD from AMSAT-NA
>   (http://www.amsat-na.com/item.php?id=100034) but only back to '95.
>   This seems like a circuitous route to solving my pressing problem.  I
>   will try to get our lab to get a copy but hopefully I can find my
>   answers here on this list.
>   My most pressing question is, is there any major reason why my FSK
>   radio cannot synch with the D700's calibration signal?   If I am
>   slicing and descrambling my bits correctly, shouldnt I see a square
>   wave? I suspect that somehow the modulations don't match.  The square
>   wave should be a balanced signal so there wouldnt be any averaging
>   drift
> ----
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