[Elecraft] Yaesu SSM-17A mic with KX2?

[Mark Cohen]

Hi folks,

I recently purchased a Yaesu SSM-17A <https://www.amazon.com/Yaesu-Standard-Microphone-SSM-17A-Replaces/dp/B089YW2BP9> speaker microphone hoping to use it with my KX2. I don't need the up/down buttons on the Elecraft MH3, and it's less than half the price.

I'm surprised to find that the PTT button on the Yaesu speaker mic does not seem to work with the KX2. I've tried every combination of the MIC BIAS and MIC BTN options to no avail. I can get audio out from the mic using the front panel XMIT button, but the PTT on the hand mic does not key the transceiver.

Does anyone have advice on debugging this? Or is it just fundamentally incompatible? I'm surprised because the connector is exactly the same as the Elecraft MH3.

Thanks in advance for any knowledge you might be able to share, and 73 de Mark WA7MPC.