Module: PWN::SDR::Decoder::RTTY

Defined in:
lib/pwn/sdr/decoder/rtty.rb

Overview

RTTY (Radioteletype, ITA2/Baudot) decoder for the amateur RTTY sub-bands (rtty20/rtty40/rtty80). GQRX supplies FM-demodulated audio containing the classic 170 Hz-shift 45.45-baud mark/space tones; minimodem recovers the 5-bit Baudot stream and prints ASCII.

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. support@0dayinc.com



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# File 'lib/pwn/sdr/decoder/rtty.rb', line 46

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <support@0dayinc.com>\n"
end

.decode(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SDR::Decoder::RTTY.decode( freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq' )



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# File 'lib/pwn/sdr/decoder/rtty.rb', line 16

public_class_method def self.decode(opts = {})
  freq_obj = opts[:freq_obj]

  # minimodem reads s16le mono from stdin at the rate we hand it; keep
  # sox at 22 050 Hz (Base default) and tell minimodem the same.
  PWN::SDR::Decoder::Base.run_pipeline(
    freq_obj: freq_obj,
    protocol: 'RTTY',
    required_bins: %w[sox minimodem],
    decode_cmd: 'minimodem --rx --quiet --rtty -R 22050 -f -',
    line_match: /\S/,
    parser: proc { |line| parse_line(line: line) }
  )
end

.help ⇒ Object

Display Usage for this Module



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# File 'lib/pwn/sdr/decoder/rtty.rb', line 52

public_class_method def self.help
  puts "USAGE:
    #{self}.decode(
      freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq'
    )

    #{self}.parse_line(line: 'RYRYRY CQ CQ DE W1AW')

    #{self}.authors
  "
end

.parse_line(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SDR::Decoder::RTTY.parse_line(line: 'RYRYRY DE W1AW')



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# File 'lib/pwn/sdr/decoder/rtty.rb', line 34

public_class_method def self.parse_line(opts = {})
  line = opts[:line].to_s.strip
  out  = { protocol: 'RTTY', text: line }
  if (m = line.match(/\bDE\s+([A-Z0-9]{1,3}\d[A-Z]{1,4})\b/))
    out[:callsign] = m[1]
  end
  out[:summary] = "RTTY #{line}"[0, 120]
  out
end