|Subject:||Re: [Discuss-gnuradio] Help decoding Bell 202|
|Date:||Mon, 28 Dec 2015 17:08:59 -0500|
Thanks, Tim. That really clarified a lot of confusion that I had!
I have uploaded the files here:
-"bell202new.grc" is the current flow graph.
-"dump" is how the input signal I'm trying to decode looks like.
-"decoded" is the bytes of a successfully decoded signal, which was decoded
previously using some hardware equipment. (some parts of the data may be
-"imet.pdf" explains the data packet.
-"tcp.py" explains the data packet.
As far as I know, at the physical layer the data is modulated using Bell
202. The data framing is not AX.25, but conforms to UART, although I'm
unsure about the parity and stop bits. I tried looking for the data frames
by looking for start/stop bits, the header. I've also tried flipping the
bits. However, it still doesn't look quite right.
Correct me if I'm wrong: your FSK demod block uses tone detection to
demodulate, which is passing the signal through two band pass filters in
parallel, and determine which comes through (as in p.9 of
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