[amsat-bb] Help decoding/understanding terrestrial packet heard on ISS freq 145.825 MHz

Robert Bruninga bruninga at usna.edu
Fri May 1 22:36:21 UTC 2015

They are probably from PCSAT (NO44) which also acts like a digipeater on
145.825 when sun angles are good.  But PCSAT is *barely alive*.  It can
barely do one or two packet users per pass before the batteries die again
(every orbit).

You can hear PCSAT more than you can decode it, since the batteries are so
weak, they usually cannot even finish a single packet before the TX power
drops off to nothing.  So you never decode bcause  you don't get the valid
checksum at the end.  You might tyry having PASSALL ON...


>  I heard automated packet transmissions on the ISS packet
> frequency when the ISS wasn't in sight and recorded them to try and
> figure out who/what they are, but my software isn't decoding anything.
> Can you help me understand what they were, or even better, decode them
> yourself?

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