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Re: DSP-12 - a good P3D 400 Bd TLM receive modem



As a matter of fact, I do have one of these getting dusty, I will file this
message for the day when I can again pull out my TS790, my DSP-12 and the
other goodies that worked so well for me in the past.
Thanks


Rudy Benner



----- Original Message -----
From: "Bent Bagger" <oz6bl@fern.dk>
To: "The Amsat Bulletin Board" <amsat-bb@AMSAT.Org>
Sent: Saturday, September 30, 2000 5:13 AM
Subject: [amsat-bb] DSP-12 - a good P3D 400 Bd TLM receive modem


> Now is the time to dust of that DSP-12 which is sitting on your shelf and
> prepare for the upcoming launch of P3D, because here is some good news for
> all you DSP-12 owners: I have uploaded a modified version of the 400 Bd
> PSK modem for the DSP-12 to the following URL:
>
> ftp://ftp.tapr.org/dsp/Motorola/dsp56001/dsp-12.
>
> The modification consists of a change to the software so that it sends 514
> bytes rather than 512 to the listening program. In this way also the CRC
> bytes will get transmitted to the listening program.
>
> The modified modem has been tested by Stacey Mills, W4SM, and he has this
> to say about the modem:
>
> "I burned the new eproms and checked out the 400 baud PSK demodulator with
> 514 byte capacity. It works very well... Actually, very, very well. In
> fact, doing some tests with some 400 baud PSK wave files that I have
> generated, having a calibrated background noise, the DSP-12 functioned as
> well or better than any other modem I have tested"
>
> The file gce201.zip contains these files:
>
> READ.ME
> GCE.V40 - Executable that may be downloaded to the DSP-12
> GCE.B - PROM image for the B-PROM. Checksum: $1900
> GCE.D - PROM image for the D-PROM. Checksum: $5000
> GCE.F - PROM image for the F-PROM. Checksum: $4900
>
> Have fun.
>
> Best 73 de Bent/OZ6BL
> (also oz6bl@amsat.org)
>
> ----
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>

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