[Elecraft] Hum on TX audio w/ CM500 headset on KX3

[Jim Brown]

On 5/10/2020 8:49 PM, Jim Brown wrote:
> On 5/10/2020 5:45 PM, Frank O'Donnell wrote:
>> I was mostly curious why the CM500's mic produced the hum, but the 
>> handheld mic that came with the KX3 didn't. The CM500 has a quite long 
>> cable, and I wondered if that could be part of the problem.
> 
> Any one or a combination of the various issues I noted. Your observation 
> about your finger on the coax connector suggests bonding and/or adapters 
> that aren't doing what you think they are.

More obvious questions I should have asked -- Exactly what is your 
antenna, including any counterpoise? How long is the coax? How far from 
the shack? Is there a serious choke (per my cookbook) at the feedpoint? 
Is it possible you have a bad piece of coax or a poorly installed 
connector? Is your shack bonded? It should be, regardless of this problem.

73, Jim K9YC