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Text File  |  1999-10-21  |  190b  |  13 lines
  1. Key-operated on/off switching of an RF carrier 
  2.  
  3. AFSK (audio frequency-shift keying) of an FM signal
  4.  
  5. FSK (frequency-shift keying) of an RF carrier
  6.  
  7. DTMF tones modulating an FM signal
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  11. 2
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