Jim,

You can verify by looking at the schematic - but -

The rear microphone jack is indeed a stereo jack, but the signal is 
mono.  A stereo plug is just great, the AF line should connect to the 
tip and the shell.

73,
Don W3FPR

Jim Hoge wrote:
> Tnx to all that responded. I now have the hand mic working as it should be- 
> all it took was to toggle the mic gain to high. However, the mic of choice 
> will be via the rear panel and it will take some more detective work. The 
> manual says it is a mono jack but I think what threw me was that the 
> microKeyer employs a stereo plug. If indeed it is a mono jack, I will need to 
> jumper the ring and the shield on the stereo plug that terminates the mic 
> cord (other end is a 3 pin XLR). The mic is a dynamic one, a Heil PR-20. It 
> seems to make sense that the low levels of less than stellar audio would be 
> due to the return floating in a trs plug when the ring is unconnected. The 
> shield must be picking up some to give me something. The cable is good so 
> only other option is bad mic but I haven't tried it on another radio yet. 
> Sounds like a project for a three day weekend, hi. 
>
> Does the K3 employ a mono or stero jack for the rear mic connection?
>
>   
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