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Re: DSP Modems


A group of hams from around the world are discussing the idea of
creating a software defined DSP radio for the satellites. The idea is to
decode the data from the RF rather than the audio, hence the data modem,
if you will, is part of the radio.

So far we have had lots of good discussion and I think are on the way to
a preliminary design specification. We are trying to model the
development of the radio after the on-line collaborative efforts of the
Linux developers. As you can appreciate the design and construction of
such a radio is a complex project, one beyond the scope of most
individuals. The hope is that collectively we will have the expertise.
By using the Internet, each person can contribute with their area of
expertise, and everyone benefits. In such a project, there are many
tasks to be performed, some technical, some organizational, some
requiring communication and writing skills, and many more, so that
anyone can contribute in one way or another.

The archives of the discussions are on the DSP-Radio mailing list at
http://www.qth.net You may also subscribe from this web page. 

A web page for the project is in development and should be available

Please join us if you are interested.

Darrell Bellerive

"John P. Toscano" wrote:
> laura halliday wrote:
> >
> > "Walls, Jim R" <WALLSJR@sce.com> wrote:
> >
> > >LH> You could create them yourself.
> > >
> > >That's fine for someone who knows how to write DSP code.
> > >That's an area I have not a clue about - and I would suspect
> > >that almost everyone out here is in the same boat..
> >
> > DSP is not a "howto" kind of subject - it requires
> > theoretical background, which you then apply to tasks
> > like making a computer listen to noises and turn them in
> > to data. You could look at source code - there are several
> > open-source PSK31 programs which do very similar things,
> > albeit in slow motion - but without said background, the
> > code is meaningless. Without said background you're not
> > going to be able to modify it, either.
> Laura:
> Thank goodness for the clarification.  When I saw your earlier
> response ("create them yourself"), I started looking into the
> subject a little bit, and quickly decided that it was way
> beyond my abilities at present.  And that's from a person who
> is well-trained technically in unrelated but mathematically
> intensive areas such as the modeling and prediction of
> pharmacokinetics and pharmacodynamics of pharmacologic agents
> in biological systems (mainly humans), and someone who owns
> and operates his own software development company in his
> "spare time", self-taught in FORTRAN, BASIC, 8080, Z80, 68000
> assembly language, and C.  Now I don't feel so inadequate.  ;-)
> Maybe there is a need out there for someone who DOES have the
> background (like you perhaps?) to work on a "universal DSP-based
> modem" for all terrestrial and satellite modes known to mankind
> and those yet to come.
> I think that TAPR and AMSAT once had a kit that came close, but
> they no longer make them.  Maybe that same project could be
> updated using a newer DSP Evaluation Board and new software, and
> made available to the Ham community.  (Motorola lists the chip
> used in that board as "no longer recommended for new products",
> though not yet officially terminated, and indicate that there is
> a newer board that is superior in performance and fully upward
> compatible.)
> Just a dream, I guess, knowing how busy *I* am these days, and
> I know few people who really have a lot of idle time on their
> hands.  But I guess I can dream, right?
> 73
> John Toscano, Pharm.D.
> KBØZEV, EN34js
> (Je ne parle q'un petit peu de Francais.)
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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