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

[fdigio1 at gmail.com]

Hi Larry,
Excellent job, but why don't you have published some pictures of the bakelite insulators?
How the rotor must be oriented regarding the red dot on the gear?
The dot on mine is faded away and there is no dimple on it. ☹

Best regards
Francesco Di Giovanni - IN3XZP


-----Messaggio originale-----
Da: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> Per conto di Larry H
Inviato: venerdì 28 giugno 2019 02:40
A: R-390 Forum <r-390 at mailman.qth.net>
Oggetto: [R-390] Fwd: R-390A Antenna Trimmer Repair

Al has graciously put this document out on the R390 disk for our viewing pleasure.  Here's a link to the Tutorials section that has the link to
it:   http://r-390a.net/faq-refs.htm#Tutorials  or here's a direct link to
it:
http://r-390a.net/R390A%20Antenna%20Trimmer%20Cap%20Repair.pdf

Regards, Larry

---------- Forwarded message ---------
From: Larry H <larry41gm at gmail.com>
Date: Sun, Jun 16, 2019 at 5:15 AM
Subject: R-390A Antenna Trimmer Repair
To: R-390 Forum <r-390 at mailman.qth.net>

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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