On 31 Jul 2023, at 23:08, Spencer Tomlinson <unavailable.equal@...> wrote:

?Hi, Steven,

? ? ? ? ? ? ? ? ? ?I’ve had a few MD100’s and they have a common failing. The shield wire drops off and you lose microphone ground (not to be confused with signal ground on pin 5). The actual mic is wired to Pin 8 and pin 7. Check continuity between pin 7 as this is the shield wire and microphone ground.

? First you normally get an annoying hum with your audio that eventually becomes no audio.

?This may or not be your problem but I’ve got a genuine brand new mic element here that was bought because I misdiagnosed the element as faulty when it was actually the mic shield/ground wire.

? Also remember the FT847 has an option to have the FM mic gain on the front knob or from a present in the display. The MD100-ADX has really poor gain in my experience. ?Menu 25 FM-Pset. Turn that up to max for testing (level from off to 0 to 63) and also the front mic gain obviously if this is set to off.

? I hope this helps.

De Spence M0STO?

Sent while portable! please excuse typos.

On 31 Jul 2023, at 22:20, Steven KC3DOW via groups.io <treasurebox7762@...> wrote:

?

I have a Yaesu MD-100A8X microphone connected to a Yaesu FT-847 radio and when I press the PTT the radio shows a carrier going out and the carrier is being seen by all parties but no audio. Through the repeater..

?

I don’t think the problem is in the radio because when I connect the hand microphone it works OK.

?

I have no idea how to troubleshoot this but I am a quick learner. I replaced the mic. To radio cord but I still have the problem.

?

Thanks,

Steven/kc3dow

Note. I posted this on the other ft-847 group thinking it was here.
It seems that I was not a member of this group.