[Elecraft] K3: Problem with CM-500 plugged into front panel through AD1K

[Don Wilhelm]

Stan,

Try a test - put a bare stereo plug into the adapter and check with your 
ohmmeter to see if there is continuity between the ring and the shell of 
the plug.
If so, that is the reason - the adapter is using a mono jack and the 
CM500 has a stereo plug.  The tip and ring of the CM500 mic plug are 
connected together, so when plugged into a mono jack, the audio is 
shorted to the shell.

73,
Don W3FPR

On 1/21/2014 4:14 PM, Stan Rowe wrote:
> Does anyone have any ideas why my Yamaha CM-500 microphone won't work when
> plugged into the front of the K3.  I am using the Kenwood AD1K adapter and I
> have the firmware set to select the front panel, low gain, with bias on
> (FP.L bIAS).  The CM-500 headphones are plugged into the Phones jack on the
> front of the K3 and work fine.  The CM-500 mic plug (grey) is plugged into
> the corresponding jack on the AD1K.   When I press my footswitch, the K3
> goes into transmit but there is no audio when I speak into the CM-500's
> microphone.  I have tried the footswitch plugged in both on the back of the
> K3 and into the AD1K footswitch jack and it works fine (puts the K3 into
> transit) in both cases.
>
>   
>
> When plugged into the rear Phone and Mic jacks on the K3, the CM-500 works
> like it should.  In that case I have the firmware set to RP.L bIAS.and both
> the CM-500 microphone and headphones work fine, so I'm quite sure the CM-500
> is not the culprit.
>
>   
>
>