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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.