Batboard

Hey all. I have an "advanced mobile mic" (HMN4069) that I'd love to use with some ham gear I have (Kenwood TMD700A). I'm attempting to create an adapter from a piece of cat6and am kind of stuck.

I have pinouts for both the Mic and the Radio, but not matter what I do, I cant seem to get the Mic Audio right. I've successfully located/connected the Ground and PTT from the radio to the adapter, and can key/unkey the mic, but cant get any audio into the radio.

I know the mic is good, know the radio is good.

Anyone have any pointers?

The Motorola radios supply a bias voltage on MIC HI line, you'll need that to get any audio out of one. If there's no bias from the Kenwood radio you'll have to rig something up, I think there's usually an 8 volt connection on Kenwood mics sockets? You could probably connect that to the microphone audio line through something like a 1.5K resistor and then use a blocking capacitor between there and the Kenwood mic input (probably something between .1 and 1uF, you might have to experiment to get the best audio).

A HA! Thanks!