[Elecraft] P3 TX Mon question

[W4CCS]

I have two K3's and two P3's but only one has the TX Mon option.. When I
transmit with the K3 that does NOT have the TX Mon installed, the P3 that
does have it reacts showing VSWR and one sweep of the transmit envelope..
This seems very strange.. The only thing in common between the two is the
MicroHam router program..  Suggestions..??

 

Clyde Scott - W4CCS

Moultrie, GA - EM81cg