[Fwd: [TowerTalk] CDE HAM II Rotor . . . another question]

[Steve]

A number of you responded with helpful suggestions regarding the problem 
outlined below. My thanks to all, your advice is invaluable!

It is almost certain that the meter is sticking. I haven't had time yet 
to attempt to repair it, but when I do it will again be based on advice 
from some of you out there.

I hope to get to it in the near future and will let you know how it 
turns out.

73,

Steve

-------- Original Message --------
Subject: [TowerTalk] CDE HAM II Rotor . . . another question
Date: Thu, 27 May 2004 20:51:12 -0400
From: Steve <steveac at charter.net>
To: TowerTalk at contesting.com

Several of you were kind enough to help me a few weeks with a question
about a CDE HAM II rotor. Now I have another issue and thought I'd try
my luck again.

I bought this CDE Ham II rotor in 1976, used it for about five years and
removed it from service and stored it.

The problem I'm having is with the direction indication on the control
unit. If the rotor starts at full south and I turn it in the SENWS
direction, it seems to work ok. But if it's full south and I turn it in
the SWNES direction, the indicator meter on the control unit stops at
about 270 degrees even though the rotor is still turning. When the rotor
gets to about 360 degrees, the meter jumps to the correct indication and
works ok through the rest of the travel to south. So the indicator meter
works OK in one direction but not the other.

I thought there was a problem with the potentiometer assembly and so
bought a new one from the Hy-Gain people at Dayton. I replaced it and
learned that the new potentiometer assembly exhibits essentially the
same behavior as the old one :(

With the top casting removed the potentiometer assembly is readily
accessible and easily turned by hand. I see the same 270-to-360 jump
when turning it by hand.

Where do I go from here? Two defective potentiometer assemblies? It
seems like pretty long odds that a potentiometer assembly from 1981
would exhibit the same anomalous behavior as a new one I bought this month.

Any advice out there?

Thanks.

Steve
_______________________________________________

See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
any questions and ask for Sherman, W2FLA.

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