[Elecraft] KXPA100 will not activate from KX3 when PX3 is installed

[Josh Walton]

When I install the KXPA100 (with ATU) with the KX3 & PX3 I am unable under the “PA MODE” menu item to select “ON”.  I only have two choices in this menu, “OFF” and “Pout CAL”.  When I turn the VFO A to the left from the “OFF” setting, there are two relay clicks only.  When I remove the plug from the “ACC 1 PC” plug on the PX3, and move it to the KX3 (after removing the one there that runs to the “ACC1 RCVR” I have the same behavior, however if I restart the PK3, it will now activate the KXPA100 and operate normally.

I have triple checked the wiring.  PX3 operates as expected (although the rotary encoder is a bit jumpy, but that’s another story.)

Firmware Versions:
KXPA100: 1.32

PX3:1.39

KX3 MCU 2.38, DSP 1.37

Any advice on what is going one would help!

Thanks!
73

KK4LGZ
Josh