[R-390] PTO Desicant

[Peter Worrall, G4GJL]

Do it!
The PTOs were originally built with dessicator packs included. Ive seen some 
with three packs.

I presume you know the stuff can be re-activated by bakink in the oven. 
Watch out for the more modern bags, as they are plastic based and melt at 
the reactivation stage. The older paper or colth ones are the best in this 
respect, however they let dust particles out from chipped dessicant 
granules.

You choose!

Pete
G4GJL
----- Original Message ----- 
From: "KC8OPP Roger S." <kc8opp at yahoo.com>
To: <r-390 at mailman.qth.net>
Sent: Saturday, July 16, 2005 1:41 AM
Subject: [R-390] PTO Desicant


>I have finally dug into the PTO on a R-390 that has
> been here in the shack for about 20 years.  It has
> never indicated the right freq and I am tired of
> remembering the offset.  Overall the radio is in good
> shape but the PTO has been off for a long time.  I
> measured 6.3KHz non-linearity end to end so it is
> time.
>
> When I opened up the inner can I was surprised that
> there was not a desiccant pack.  Not too bad on the
> inside, a bit of dirt laying around and an ugly dark
> grease smeared all over the corrector stack, but it
> should clean up nice.
>
> What does the group think, should I put a desiccant
> pack inside when I put it back together?  I have a few
> laying around that I have collected over the years and
> could dry them out and tie them to one of the support
> rods.
>
> Thanks for any thoughts and wish me luck with the
> corrector stack.  Done a few "A" PTO's with the screws
> out the front, but this is the first corrector stack
> adjustment.
>
> thanks for the thoughts
>
> 73's
> Roger
> KC8OPP
>
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