The cm500 has two 3.5 mm TRS (3 conductor) plugs.  One for mic, and the other is l/r/ground.
the kx3 has an option to turn off the PTT and mic button functions.  Turn these off, and use the XMIT button on the kx3 to go in and out of transmit.

Or, you can set up box and do it that way.

I personally, never use vox.

Works very well.

Incidentally, the kx3 is on its way back from the elecraft hospital.
Had a problem with the dc in jack.  Also I had them install the 2 meter transperter board.
Now has 160 through 2 meters, all mode.

Can’t wait to play.

Gary Lee
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On Aug 22, 2014, at 10:25 AM, Michael Ryan <[log in to unmask]> wrote:

> Garry:=20
> 
> You posted that you use a Yamaha CM-500 with your KX-3. What type of =
> jack allows it to connect to the KX?=20
> Is it the sam jack that Heil uses to mate with its various adapter kits? =
> I believe its an XLR but not sure.=20
> Also, is there a switch that you can either turn off an on to key the =
> rig, leave it on for VOX mode or use it in tandem with a hand or foot =
> switch?=20
> I'm actually thinking of picking up one and putting my Pro Micro Duel =
> away.=20
> 
> 73:=20
> Mike VO1AX=20