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Re: 56002 EVM and 38k4



Gentlemen,

Seeing loopback tests failed, looks like more research is needed.
It is very suprising that 384K with tracking and Doppler even works on UHF! 
AFC, tracking etc..

73, Scott
PS... If you are in the Central California Area, ie. Monterey tomorrow, 
Saturday, join us at the Radiofest!
www.radiofest.org for more info.

73, Scott



----- Original Message ----- 
From: "Mark L. Hammond" <mlhammond@charter.net>
To: <amsat-bb@amsat.org>
Sent: Friday, February 25, 2005 7:28 PM
Subject: [amsat-bb] 56002 EVM and 38k4


> Well, so much for that idea---here are some interesting results using a 
> loop back test (TX radio port 1 and RX radio port 2)
>
> If I set the 38k4 code to:
>
> 9k6 xmit/9k6 rcv, the loop back works fine
> 19k2 xmit/19k2 rcv, the loop back does NOT work at all
> 28k8 xmit/28k8 rcv, the loop back works almost works; I connect to myself, 
> but nothing else
> 38k4 xmit/38k4 rcv, the loop back does NOT work at all
>
> So much for generating wave files!
>
> I'll have to look closer at the Sprint-2 to see if it will xmit 38k4...
>
> 73,
>
> Mark N8MH
>
> >//Now that I have two confirmed/working TNCs (okay, one is a DSP ;) for 
> >38k4, I think I will try to get my TAPR DSP56002 EVM unit outputting 38k4 
> >data (presumeable it can, by just a quick edit in the code so it xmits 
> >38k4 instead of 9k6).  So, essentially EVM 38k4 OUT --> Paccomm 38k4 IN 
> >is the test.  If I can get that working, then I can begin an attempt to 
> >record (and playback) some 38k4 packet audio files for Doug (and others 
> >that might be interested...), as well as experiment a bit with the 
> >PCR-1000 in my shack.
> >
> >Looks like a fun project for this weekend!!
> >
> >73,
> >
> >Mark N8MH
>
>
> Mark L. Hammond  [N8MH]
> ----
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----
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