GNU Radio blocks for RTTY and PSK31
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bitglue Implement incoherent PSK31 demodulator
In some circumstances, the theoretical 3dB advantage of a coherent
demodulator in an AWGN channel may be more than offset by the practical
difficulties getting the Costas loop to converge.
Latest commit 3a00e28 Jun 22, 2017

README

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A GNU Radio module for demodulating radioteletype, AKA RTTY. And also PSK31.

If running the examples, be sure to run from that directory. Some of them open
WAV files for input with relative paths, expecting them to be in the current
directory. You'll need to either start GRC from the examples directory, or
generate (but not run) the blocks with GRC, and then run the generated program
from a terminal or something.

Summary of Contents:

radioteletype.demodulators.rtty_demod_db

  A hierarchical omnibus block. RF in, ASCII out.

radioteletype.demodulators.async_word_extractor

  Extract words from an asynchronous serial protocol. That is, something with
  start and stop bits.

radioteletype.demodulators.baudot_decode_bb

  Decode Baudot code to ASCII.

radioteletype.demodulators.varicode_decode_bb

  Decode Varicode to ASCII.

radioteletype.demodulators.tone_detector_cf

  The detector used for individual FSK tones.

radioteletype.demodulators.psk31_demodulator_cbc

  Modulated PSK31 in, bits out. Send output to varicode_decode_bb for ASCII
  output.

radioteletype.filters.raised_cos

  Generate FIR taps for a raised cosine filter.

radioteletype.filters.extended_raised_cos

  Generate FIR taps made of a sequence of raised cosine filters which
  approaches a boxcar function while maintaining zero ISI. See
  examples/recursive_filter.grc

radioteletype.modulators.am_fsk_mod_bc

  Generate FSK by switching the envelopes of two free-running oscillators.

radioteletype.modulators.fm_fsk_mod_bc

  Generate FSK by FM, optionally with some filtering of the modulating signal.

radioteletype.modulators.baudot_encode_bb

  Convert ASCII to Baudot code.

radioteletype.modulators.varicode_encode_bb

  Convert ASCII to Varicode.

radioteletype.modulators.psk31_modulator_bc

  Bits in, modulated PSK31 out.