could be mfsk 

tom burke
  ----- Original Message ----- 
  From: deadgoose38 
  To: digitalradio@yahoogroups.com 
  Sent: Thursday, April 02, 2009 6:13 PM
  Subject: [digitalradio] Newbie question


  Hear a digital signal -- maybe 8+ tones. Starts with a low one, then shifts 
to series of single ones at a higher frequency, then returns to the "base 
tone." What am I listening to? Will DM780 decode it? If not, what? Seems pretty 
common on both 40 and 20 meters.

  /paul W3FIS


  

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