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Volunteers needed to record 38k4 signals from Echo

AO-51 is again in 38k4 mode (from UTC April 18 
through and including UTC April 20).

I am working on a DSP soundcard demodulator
for the 38k4 signal from Echo and I am looking 
for volunteers to record the 38k4 signal from Echo
using their computer soundcard.

Do you already have a working 9600 baud setup
with a discriminator output? Do you have a radio 
with a wide enough receive bandwidth that it can 
pass the 38k4 signal, and do you have a soundcard 
that can record at 48000 samples per second 
or faster?

If you have all of the above, then you can try
to record the 38k4 signal from Echo.  I'll take
whatever recordings I can get.  If you have a
favorite soundcard recording program, then 
just set it to record 8-bit (or 16-bit) samples, 
48000 samples per second (or faster) and then 
record as much of the pass as you can.  

If you don't have a suitable recording program,
I have an "experimental" recording program you
can try at


It's about 190k to download. There's nothing to install
except the EXE, and the documentation is in the .ZIP
file.  Audio level adjustment is critical, so I suggest
you try to make a recording BEFORE the satellite
pass in order to adjust the levels.

Please let me know if you have any questions.

Douglas KA2UPW
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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