[aprssig] AFSK smart phone modem needed

Robert Bruninga bruninga at usna.edu
Thu Mar 29 20:13:15 EDT 2018

A company contacted me looking to hire someone to write them an FSK
modulator for a smart phone.
Turns out, the tones are the same standard 170 Hz shift used for decades
for RTTY and at 100 baud.

Bob, WB4APR.

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