[aprssig] 60 Grid Squares for APRStt satellite?

Jason KG4WSV kg4wsv at gmail.com
Fri Feb 13 20:27:10 EST 2015

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There are 16 DTMF tones. 2 tones can represent any 8 bit ascii character. 4 tones can represent any 2 character grid prefix with no ambiguity. 

-Jason

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