Each module contains the transmitter IC and baseband circuitry, with user-accessible digital and analogue inputs, which enables even analogue signals like AFSK, GMSK, DTMF tones to be transmitted. A ...

Amateur radio operator [KE4FOX] wanted to build his own 2M fox hunt transmitter for use at conventions ... low-pass filter combined with a hardware DTMF decoder, all controlled by an ATmega328P ...