[R-390] R-390A Antenna Trimmer Repair

[Larry H]

Well, I was hoping to never have to work on the antenna trim variable
capacitor, but here it is, staring me down, daring me to open this can of
worms. It has the 'rotor' grounded, which is not good for the AGC, and some
static when rotating it to tune for best signal. I thought I'd look around
the Pearls and the Y2KR3 tech manual for some help, but found only a little
bit there.  So, I thought I'd document what I found on my journey.  It's
attached for your reading pleasure.

Let me know what you think.

Regards, Larry
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