Chris Attebery <[email protected]> writes: > I was talking to a friend at lunch today about buying a HT and he asked me > what type of modulation the TeleMetrum uses.
The native modulation scheme is Gaussian frequency-shift keying (GFSK) with a 38k4 raw data rate and rate-1/2, constraint 4 convolutional encoding (forward error correction). The APRS support is I believe 9k6 FSK, and the audio beeps are effectively FM tones. Bdale
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