[Elecraft] Heil headset with HC-4 revisited

[Walter Underwood]

It might be noise on the bias. Some people have reported that.

With a mono plug, you’ll get the mic bias (clean) and the logic bias (not so clean, wrong voltage) mixed together.

Using a stereo plug or a stereo-to-mono splitter will give you just the mic bias. Details here:

https://observer.wunderwood.org/2015/08/16/yamaha-cm500-headset-with-ptt-on-elecraft-kx3/

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On May 14, 2020, at 11:15 AM, Bert <ve3nr at bell.net> 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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