[Elecraft] K3 Mic connector options

[Don Wilhelm]

Bill,

I would suggest that you can obtain a Heil Kenwood adapter that is used 
for the Elecraft ProSet-K2 (I forget the exact Heil designation) that 
will allow you to connect the CM500 mic - you will also need a 1/8 inch 
stereo female to 1/4 inch male adapter to match the headphone jack on 
the adapter.

If using that adapter, you would need to unplug the MH2 and plug in the 
CM500 (with the adapter) and adjust the mic gain.

OTOH, If you want to construct a box with a switch, that will work too.

In any case, I would suggest you turn off MIC+LINE unless you are also 
using a computer to send pre-recorded messages.

When you switch to digital modes, the "mic sel" should be set to LINE IN 
only - the audio input settings for SSB and digital modes are 
independent in the K3.

73,
Don W3FPR


On 5/16/2013 7:35 PM, Bill Frantz wrote:
> I have been trying to get my CM500 headset running with my K3. Using 
> the MH2 mic plugged into the front panel with MIC SEL to FP.L bias in 
> the voice modes (AM, FM SSB, & CS) while MIC SEL is set to rP.L bias 
> for the DATA modes. MIC+LIN is set to On for all modes. This setup 
> works well using VOX for transmitter keying in DATA and manually 
> turning VOX off and using PTT when I run voice modes. (I'm mostly a 
> DATA A and AFSK A operator.)
>
> If I plug the microphone from the CM500 into the rear panel of the K3, 
> and change MIC SEL to rP.L bias, this division between voice modes and 
> data mode no longer works. Noise in the shack keys the transmitter, 
> and I assume is added to the output signal -- not good.
>
> So, my current plan, unless someone says, "Hey Dummy!", is to build an 
> interface box which plugs into the front panel MIC connector to route 
> the audio from the CM500 to the K3. I can include a jack for a foot 
> switch to do PTT and set it up so the MH2 is also available. (Thanks 
> Don for the pointer to Universal Radio for the Mic connectors.)
>
> My questions are: What to do with the other 3 lines? I can add buttons 
> to UP and DOWN lines to provide another way for tuning the radio, but 
> what does the FUNCTION line do? And, can I parallel the Mic audio from 
> the CM500 and the MH2 or would it be better to switch them? (Fewer 
> switches and modes will make my wife, KI6SLX happier.)
>
> Cheers - Bill, AE6JV
>
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