Ham & DSP

Related histories, facts and opinions by EA2BAJ

hit(s) since 15 May 1998
(Last modified 9-Mar-1999)


I am a new Ham, I have recently (July-1996) get my CEPT-1 Class licence after having owned the following Callsigns: EB2FUQ and EC2AGF. I am mainly interested in digital modes, as I come from the computer environment. I haven't still made a HF voice QSO.....

I am presently trying to learn as much as possible (very little time, very little results) from digital modulation over radio. More especifically using DSP evaluation cards from Texas and Motorola. At the moment I am almost exclusively using them not programming, but I think that time will arrive.


The idea is to use a DSP to produce the modulation/demodulation (Modem) part of a Multimode Controller. What does this mean? For example, if you get a VHF 1200 packet modem, once you load the DSP with it you have the equivalent of a TNC in kiss mode, you need a soft driver to get for example a HOST interface and later a program that is able to talk to a HOST TNC. So if you want to have a Mailbox running you need a computer running all the time.

There are several advantages using DSP:

There are also disadvantages

What to use / Where to search

There is another DSP in use on Ham applications the Texas Instruments TMS320 family (the C26 and C50 families). As far as I know there are applications for VHF 1200/9600 packet, Rtty/Ascii, Amtor and Pactor (Tx/Rx on FEQ and ARQ !!!), Flexnet drivers, and several nice audio filters. I miss here the Jvfax 7.1 Interface You can begin take a look here.

There is another DSP, the Analog Devices 21000 SHARC Family, that is begining to have use in HAM by the hand of Michael Keller DL6IAK. He has just developed a PSK31 version for this platform, and he has also been working on a RTTY modem for it.


Sites that are worth to take a look

Do you want to hear several HF modulations?. Here you can several modulations.
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