Yep, the hum is because it doesn't know the words... yuk, yuk. Actually
your memory is correct, you have bad starting capacitors in the control
units. As I recall, it is about a 6-8 mfd. non-polarized 50-volt cap. I
think it is marked so it should be easy to find the value. You have two
options, hunt down a low voltage starting cap from one of the rotor repair
"doctors" or just go to the local electrical motor supplier and get one
rated for 117-volt AC use. It can be a little lower in capacitance as the
higher voltage rating will usually read a higher cap value at lower voltage.
Luckily, modern starting caps are much smaller than vintage caps so room
shouldn't be a problem (carry the old one with you just in case!).
If the controller has a large ratcheting pointer dial, it is probably an
AR-22 which is fine for small VHF/UHF antennas.
See http://www.rotorservice.com/prod1%20rotor%20sales.htm
73 de Perry - K4PWO
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of HansLG@aol.com
Sent: Tuesday, March 09, 2010 7:09 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Rotor questions
I purchased a box with some "radio junk" on a auction for a few $$ some
time ago. It contained a bunch of CB radios but on the bottom I fount two
antenna rotors with control boxes.
Today I decided to make the "keep-or-through" test of the units. One
already had a cable between the box and the rotor which made things easier.
A
light under the control knob and a humming noise from the rotator was the
only
result. Connecting the second unit like the first, 1 -> 1, 2 -> 2 etc gave
the same smoke test result.
The rotator is manufactured by CDE (Cornell Dubilier Electronics) according
to a label under one of the control boxes. The model number is XL-1 and
there are a number of rotators it can be used with such as AR-10-XL,
AR-20XL,
etc.
The rotators have bell shaped bodies and have a "TRA-4" marking underneath.
Any advice? They had stickers with $100 written on them. Is it worth
fixing? Where do I start? I remember vaguely reading something, a long time
ago,
about a capacitor that can have dried out.
Hans - N2JFS
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