Remote Key HT

[C2]

I have an old Kenwood that I would like to set up for APRS and need a way to key the radio.

It has two plugs, one for MIC and one for SP.

Somehow the headset would key the PTT. I vaguely recall seeing it ground the mic center to ground through a 2k resistor. Is this how it works?

I tried shorting the MIC plug, but that did not work, and of course that makes no sense because you would also short your audio! It seems you'd have similar problems if you shorted through a 2k resistor.

So how's it done?

 

[Captain Kilowatt]

What model Kenwood is it?

 

[C2]

OK, I figured it out, short mic ground to sp ground! At least that made it key.

It's a TH21bt.

 

[Captain Kilowatt]

OK, I figured it out, short mic ground to sp ground! At least that made it key.

It's a TH21bt.

That's what I was going to suggest but I wondered just how old the radio was. Kenwood has a differant way of doing things from everyone else. It makes getting external mic and headsets a bitch unless you are handy at rewiring things. Glad it worked for you.