Bert,

When using a mono plug in the KX3 mic jack, turn off BIAS and also set MIC BTN to OFF.

Alternately, use the splitter recommended by Walter Underwood - if using that splitter, turn MIC BIAS on.

73,
Don W3FPR

On 5/14/2020 2:15 PM, Bert wrote:
The original Heil headset with the HC-4 element didn't work with the KX3.

I have now replaced the HC-4 with an electret, which sounded
great trying it with the KX3 before installing it in the Heil headset.
The electret, by itself, was plugged in to the KX3 with a stereo plug.

After electret installed in the headset I have quite a lot of hum. The
headset mic is connected with a mono plug to the KX3.

Any ideas why the hum appears after mounting the electret in the headset?

Bert VE3NR

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