[Elecraft] K1-4 KAT1: No voltage during SWR bridge adjustment of C9

[Mark Lampert (KB3OKS)]

Hello everyone,

I'm currently assembling a KAT1 for use with my already-completed K1-4
(which I'd previously been using with an external tuner), and I'm
having some trouble with the final step of the SWR bridge adjustment
of trimmer capacitor C9. I did verify the previous steps of setting
power output to 5.0 watts, attaching a suitable dummy load (same QRP
dummy load I used when aligning the K1), setting both variable
resistors to 60% of their travel, setting the tuner menu options to
'QLS', then entering tune mode and measuring voltage between TP1 and
the ground jumper.

[The problem:]
But I'm getting 0.0 VDC across TP1 and ground. I did remove the KAT1
board and triple check all solder joints, as well as checking for
continuity through my toroid windings. I also checked to make sure
that power was reaching the KAT1 board by measuring about 5.5 VDC
across C17 ... plus the fact that the tuner is 'recognized' by the K1
and all of its menu functions check out as normal.

Does anyone have any tips on something else that I might check, or
could it be that I've actually got a bad trimmer capacitor? I was
unable to find any similar descriptions here.

Thanks for your time, everyone. I absolutely love my K1 and can't wait
to have it be even more portable with its new ATU.

Cheers and 73,

Mark, KB3OKS
kb3oks at gmail.com