Scott,

I can think of 2 things to check:
1) Are the RJ45 connectors plugged in fully? sometimes the hood prevents full insertion - pull the hood back a bit and give the jack body a push - if it clicks, it was not fully seated. 2) Check to be certain the ACC1 cables are connected properly. The ACC1 cable from the KZPA100 goes to the PX3 ACC1 PC jack. The PX3 ACC1 XCVR jack then connects to the KX3 ACC1 jack.

73,
Don W3FPR

On 11/14/2017 1:33 PM, K. Scott Wood wrote:
I need to consult the collective intelligence and experience of the Elecraft 
Group about a problem with my KX3 - PX3 - KXPA100 Line.

After almost a year of moving and renovations, I got back on the air a couple 
of weeks ago with my KX3 Line.  It worked flawlessly when I took it apart for 
the move,  and the  KX3 and KXPA 100 worked properly alone when I recently 
fired it up.  However, when I turn on the PX3, it causes the amplifier to 
switch to antenna two, turns off the amplifier and switches the KX3 PA menu to 
off.
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