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?
HMN4069 to Kenwood MC53DM
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Hey Nurse
- was hovburglar
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- What radios do you own?: The ones with smoke inside
HMN4069 to Kenwood MC53DM
You want me to do WHAT with your radio?
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jackhackett
- Posts: 1518
- Joined: Tue Jun 10, 2003 8:52 am
Re: HMN4069 to Kenwood MC53DM
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).