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Re: [Discuss-gnuradio] Help decoding Bell 202

From: En Shih
Subject: Re: [Discuss-gnuradio] Help decoding Bell 202
Date: Sun, 27 Dec 2015 08:00:02 -0700 (MST)

Thanks for the reply, Tim.

- The WBFM is a remnant I've never corrected. I now have the audio from
- The baudrate is 1200.

This is the Fourier after Hilbert before QD:
and the corresponding time plot:
I am unsure if that looks right or not.

Is it so that the signal after QD should look something like this?
(image taken from

I have tried your FSK demodulator block, and the initial result looks nice.
However, I haven't been able to identify the characteristic preamble for
each data packet. Am I using the block correctly, or is there some
tweaking/synchronization that I should do?

En Shih

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