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Re: DSP Modems

"Jerry Keener" <jkeener@redrose.net> wrote:

>I also have noticed this.  Where can relatively new hams
>(like myself) obtain decent dsp tnc equipment if the
>commercial manufacturers are not making them?

You could create them yourself.

The highest supported sample rate on low-cost DSP gear
(sound cards and DSP eval boards) is 48 kHz (this is
the sample rate DAT uses). This will record everything
there is to record in a 24 kHz bandwidth. With a little
tweaking you can shoehorn 38k4 into this bandwidth (see
the paper from Portland). 9600 is easy.

400 is trivial - I'm currently hacking up a PSK31 program,
on the basis that the phase scope and FFT waterfall that
help tuning drifty HF signals should handle satellite Doppler
with ease...

Laura Halliday VE7LDH     "Que les nuages soient notre
Grid: CN89mg               pied a terre..."
                                   - Hospital/Shafte
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