I could not get KRX3 or Main to RX after KRX3 install.  After checks and 
rechecks with Rene of Elecraft, we discovered the W4 jumper had not been 
removed.

Now here is the "gotcha".  Manual shows jumper across two pins of a connector.  
I saw none and moved on.  My RF board is a Rev A.  The KBPF3 module mounts over 
the top of the RF board.  Guess what? The KBPF3 board covers the W4 jumper 
which is soldered to the RF board.  Cut the jumper and RX comes alive.  

I wish to thank Rene for his exemplary support.  He called me on a SUNDAY and 
spent hours on the phone sleuthing this problem.  Do you think K-I-Y would help 
you like that on Sunday?

Jim
K7EG
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