[Elecraft] My K3, P3 and Expert Linear

[William Levy]

Gentlemen,

My K3 powers on the P3 and the Expert 1.3.
Out the back of my K3 the 15 pin and 9 pin go to the Expert, the 9 pin
Serial is split and goes to the P3.

When the P3 is OFF the K3 and Expert talk beautifully together. When the P3
is on the band data gets lost on the way to the Expert and the P3 works
fine.

So my question is how do I get the Serial Data on the 9 pin K3 to talk
correctly to both Expert and P3?
At the moment the Y splitter is not doing the job.

Perhaps there is a trick I don't know or a box I need to add to the station.

Thoughts?

Sincerely,

Bill N2WL
Meeker CO