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Text File  |  1999-10-23  |  177b  |  13 lines
  1. By on/off keying an audio-frequency signal 
  2.  
  3. By digital pulse-code keying of an unmodulated carrier
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  5. By on/off keying an RF signal
  6.  
  7. By frequency-shift keying an RF signal
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  11. 1
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