It relies on the fact that almost every ham radio designed for field use incorporates a DTMF encoder in the microphone or in the transceiver itself. Hams have used Touch Tones for in-band ...
Transceiver-to-Transceiver Cloning with Optional Cloning Cable (SCU-36) - FM Broadcast Receiver Equipped - ARTS (Automatic Range Transponder System) - DTMF Operation - CTCSS/DCS Operation Busy ...
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