[Elecraft] Configuring a K3 for the PR6-10

[Dauer, Edward]

I need to ask for help configuring a PR6-10 on the K3.  Installed OK,
removed the internal jumper per instructions and am using the control line
on a Y splitter to allow the KPA and KAT to connect to the K3 as well.
Physically, all seems fine, and the K3, P3, KPA and KAT work just as they
always did.

Then to operate the pre-amp I configured digout1 to ³on² for 28 Mhz on the
K3, per instructions.  OK so far.
 

The PR6-10 manual says ³Tap RX ANT to enable preamplifier.²  When I do so
the noise level goes way down and the signals disappear, as if there were
no antenna connected to the receiver.   Removing the power plug from the
preamp made no difference in either mode ­ RX ANT on or off.
 

I recall when building the K3 that there were elections to be made about
antenna configurations when installing the sub receiver and/or
the KXV3.  I also remember that there are a myriad of ways the antennas
can be routed via the configuration menus.  I have a feeling that the
elections and internal configurations I originally made in the K3 are not
compatible with getting the PR6-10 to work simply by pressing RX ANT, but
I can¹t reason my way through it all.
 

Help, anyone?  Thanks!
 

Ted, KN1CBR