[Elecraft] PX3 interfering with rig control to KX3?

[Bill Frantz]

I was using my KX3 to operate QRP during the California QSO 
party. I had my logging program (RUMlogNG on a Mac) connected 
through the PX3 to the KX3 using an Elecraft USB <--> RS232 
interface cable.

I noticed the computer was not getting the band and frequency 
information from the KX3. When I unplugged the PX3 from the KX3 
and connected the computer directly to the KX3, the computer got 
the frequency/band information correctly, so the PX3 was 
involved in the problem. I spent the rest of the contest 
swapping the plugs in the KX3. :-(

The computer <--> PX4 <--> KX3 combination has worked in the 
past. Is there something flakey in the PX3, of have I set some 
configuration parameter badly? Or? Does anyone have any ideas?

73 Bill AE6JV

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