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Thread: Prank SELCAL call?
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Old 30th December 2009 | 21:00
  #38 (permalink)  
mnttech
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Joined: Dec 2007
Posts: 210
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From: Denver, Colorado, USA
Only two tones but 4 letters!
That's incorrect, each letter is a different tone, so you hear two tones together, then the other two tones together, making it sound like just 2 tones.
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