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DSP46002EVM code [Was: Re: 38k4 radios and modems ?]



Out of curiosity, could anyone point me to code for the DSP 56002EVM?

I'm looking for any code that has proved reliable for ham use, 
specifically the 38K4 modem.

-Freeman, N5FPP

Fernando Mederos wrote:

>	Time ago I used a PCR-1000 hooked to a DSP56002EVM to receive UO-36's
>38K4 downlink. Efficiency was not as good as with 9K6 downlinks but it
>worked. The modem implementation for the EVM was very new (sort of
>experimental) maybe a 38K4 TNC would work better now, or the modem
>implementation could have been enhanced. Doppler correction was with
>wispdde.
>
>	73,
>Nando - CX6DD
>
>On Fri, 25 Feb 2005 11:53:59 +0000
>John Melton <John.Melton@Sun.COM> wrote:
>
>  
>
>>I can also confirm that the PCR1000 works well for 38k4 data.  You do
>>need to adjust the tuning for doppler for optimal results.  The
>>PCR1000 should be configured for Narrow FM at 50 KHz and you should
>>use the standard 9600 packet socket for connection to the TNC.  The
>>Wide FM uses a different circuit in the receiver and does not have any
>>takeoff for the digital signal.
>>
>>Although not published by Icom,  the commands to control the PCR1000
>>have been well distributed on the web.  I believe that there is some
>>code to work with WiSP available.  I wrote my own in Java as I do not
>>run any Microsoft systems!
>>
>>Regards,
>>
>>-- John  g0orx/n6lyt
>>
>>On Fri, 2005-02-25 at 10:52, Graham Shirville wrote:
>>    
>>
>>> Hi All,
>>>
>>>Yes I can confirm the PCR1000 with a DB6NT downconverter is working
>>>very well listening to 38k4 data coming from the S band transmitter
>>>on SSETI Express - at least across the cleanroom where testing is
>>>presently underway!!! - Watching the packets fly across the screen
>>>makes 9k6 seem as slow as 1k2 seemed when we had 9k6 for the first
>>>time......
>>>
>>>Two caveats on using the PCR1000  tho - the quoted "wideband"
>>>bandwidth is listed as 50kHz which is marginal for 38k4 data -
>>>although I dont know the actual bandpass shape and suspect the edges
>>>are very "soft" - and I am not sure how you would control the tuning
>>>for doppler but as it is a computer controlled radio I assume it
>>>should be possible.
>>>
>>>Our "guru" Howard G6LVB is presently undertaking further research
>>>into this area so your results with AO51 will be very helpful in
>>>assisting us to make sure we have everything as right as possible
>>>for the SSETI Express groundstations - both the amateur and
>>>university ones.
>>>
>>>By the way the SSETI Express launch date has slipped a little - now
>>>not expected until late July......
>>>
>>>If you wish to see a photo of the dual band U/S "groundstation" as
>>>it exists at the moment click here!
>>>
>>> http://sseti.gte.tuwien.ac.at/WSW4/express5.php?pag=3  and then on
>>> pic 148
>>>
>>>
>>>best 73
>>>
>>>Graham G3VZV
>>>----
>>>Sent via amsat-bb@amsat.org. Opinions expressed are those of the
>>>author. Not an AMSAT member? Join now to support the amateur
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>>>Majordomo@amsat.org
>>>      
>>>
>>-- 
>>John Melton <john.melton@sun.com>
>>Sun Microsystems, IT CTO
>>----
>>Sent via amsat-bb@amsat.org. Opinions expressed are those of the
>>author. Not an AMSAT member? Join now to support the amateur satellite
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>>Majordomo@amsat.org
>>    
>>
>----
>Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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----
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