[TowerTalk] TIC Potentiomenter

john at kk9a.com john at kk9a.com
Thu Apr 3 07:22:17 EDT 2014

A reed switch works great on a prop pitch motor, where the motor is
spinning 7000-9000 RPM.  The shaft that the TIC pot is connected to turns
much slower so I am not sure how accurate the indicator would be.  TIC
used to use Bourns potentiometers which were somewhat sealed. They were
not perfect, but I have had good results with these.  I do not know if the
Vishay unit has any shaft seal. One big problem with the TIC motors is
that water can leak around the gear shaft and into the pot, which has the
shaft pointing up.  It would be nice if the motor were installed upside
down. While in Illinois I had many pot failures when it got below freezing
and any moisture inside froze.  I installed motor heaters which helped a
lot. A pot that is highly moisture resistant would be an easy solution, if
such a thing exists. I spent an hour or so yesterday searching for
replacement potentiomers and so far I have not found a better solution.

John KK9A

To:	towertalk at contesting.com
Subject:	 Re: [TowerTalk] TIC Potentiomenter
From:	 Fred Sanborn <cc-6569 at comcast.net>
Date:	 Wed, 02 Apr 2014 18:59:10 -0500

I agree the Vishay 10T pot does not seem to be a good solution. I "worked"
the pot back and forth more today and it never came back enough to be able
to use the RT-21 without the "no motion" error message again. We did have
a sever winter here in N. IL with a good amount of precipitation. However,
I just did a pot replacement and put the rotor back in service September
so I am very disappointed.

I am serious when I put the question out there to the TowerTalk community.
Has anyone considered or implemented a redesign of the TIC ring rotor
direction indication method to get away from the dreaded unreliable pot?

    TNX es 73,  Fred  KG9X

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