Questions tagged [microphone]

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8
votes
1answer
2k views

How are DTMF tones sent through a mic?

In the following diagrams, a microphone pinout is shown for several radios which have DTMF mics that work with them. How is DTMF sent to the radio without a pin designated "DTMF"? Is it through the ...
3
votes
1answer
993 views

Mic ground vs ground

Why do most radios have a microphone ground as well as a Ground? I have found that simply using one ground and tying the microphone as well as the PTT (and audio out, 5v out or whatever else is in ...
1
vote
2answers
1k views

MIC microphone ground vs common (PTT, chassis etc) ground

How do we reconcile the ground connection between audio eqp (TNCs, soundcards etc) and transceiver? Most of the audio eqp for digimodes has only one ground. I've seen that the common practice is to ...
1
vote
2answers
289 views

VOX mic that emulates PTT

I have a radio that does not support VOX, but then I got the idea that there might be a VOX mic that sends the PTT when VOX is activated? Basically a mic that will "push" the button for me. Does that ...