For my CM500 headset with the KX3, I referred to Walter Underwood
K6WRU's blog posts to order the adapter allowing the CM500 mic plug and
a PTT switch to share the radio's mic jack. I also followed his
checklist from a second blog post to set TX EQ and mic bias.
While adjusting the mic gain with the TX power set to 0.0, I noticed hum
on my audio from the CM500 mic. This was audible regardless of whether I
had the PTT cable attached, or if I left it detached and tapped the XMIT
button. The hum also appeared regardless of whether I used the CM500
phones vs other headphones. If I unplug the adapter and use the handheld
mic that came with the KX3, the hum does *not* appear.
Any suggestions on what I should look at to run this down?
Thanks and 73,
Frank K6FOD
On 5/5/20 9:15 PM, Don Wilhelm wrote:
On the KX3, look in the manual for the MIC jack connections. It should
tell you why you need to be aware of the situation that the CM500 plug
can present.
Walt Underwood K6WRU has presented a link to an adapter that will
allow you to plug the CM500 mic plug into a jack leaving the other
jack available for us as PTT. Use of that adapter does not require you
to set MIC BTN to off.
Be careful, not just any adapter will do - some are simple splitters
that put both the tip and ring on both jacks.
73,
Don W3FPR
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