I recently bought a CM-500 from B&H Photo (a recommended vendor). They were 
advertising it as having a dynamic microphone, but that was wrong. The CM-500 
still has, as it always has had, an electret microphone, which is well 
supported by the KX3 (and many other Elecraft radios. It even comes with a 
battery operated power supply which allows it to be used with equipment which 
was designed for dynamic microphones. 

I am definitely not in charge of the product literature for this device, which 
came from Yamaha.

73 Bill AE6JV


> On Apr 3, 2022, at 22:47, Jim Brown <[email protected]> wrote:
> 
> On 4/3/2022 6:58 PM, John Pierce via Elecraft wrote:
>> am finding out that the KX3 does not handle a dynamic
>> microphone well.
> 
> I disagree, and I'm an audio guy. All you need is a properly wired adapter. 
> and adjustment of TXEQ to compensate for the fact that pro mics are usually 
> flat. But nowadays, nearly all the boom mics small enough to use are 
> electrets, including the CM500. And PRO electret mics won't work with ham 
> gear -- the powering method is very different.
> 
> 73, Jim K9YC

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