[R-390] VFO (PTO)

Tisha Hayes tisha.hayes at gmail.com
Wed Dec 25 13:03:23 EST 2013


You want to keep the insides of the PTO bone-dry. It is not an environment
where dirt or moisture would ever get inside of, if you have a reason to
open the case because of a lack of tuning range or mechanical binding then
it might need a gentle cleaning with a light-solvent similar to WD-40 and
then to be blown dry with compressed air.

Things like shaft seals and the O-rings can be lubricated with a silicone
grease that is very inert.

The most that I have ever heard of us doing inside of the PTO is to clean
up the threaded rod, careful lubrication (like one drop) or to take a part
of a turn off of the variable inductor inside of the can to give you
adjustment range. It you are doing more than that you are either trying to
rescue a hopeless case or to make modifications to the device that will
throw performance way outside of the window of usefulness.

Water inside of the PTO is "BAD". In normal operation that is a sealed
environment with the express purpose of keeping water away from the
insides. If you wash it down then you will probably never drive enough of
the moisture out (even with baking) to be certain that it will perform
better than it is right now.

-- 
Ms. Tisha Hayes AA4HA


More information about the R-390 mailing list