Bad connection in one of the control wires.
Had it with my HAMIV. After replacing all wiring problem disappeared.
73 VE3DZ
----- Original Message -----
From: "Roger" <rmurad@superig.com.br>
To: "TowerTalk" <towertalk@contesting.com>
Sent: November 4, 2002 11:30 PM
Subject: [Towertalk] HAM IV strange defect
> My HAM IV rotator has a strange failure.
> One night I turned on the control box and tried to turn the beam (a single
> Force 12 C-3, nothing more). It did not turn (the needle did not move and
> the antenna really did not move too). I tried to rotate to the other
> direction. No operation. I gave up. A month later, without touching
> anything, it worked again. It kept OK for, say, two months. On a given
> night it stoped working again. One week later it came back to life. Then
> after a month it stoped working again. This cycle repeated several times.
>
> When I had the chance, during a "stop", I took it from the tower.
> Before disassembling it, I connected it (in my garage) to the control box
> using a short piece of cable. It worked perfectly... I left everything
> assembled in the garage and some days later I tested it again. The rotor
> did not turn. I disassembled it, but I did not find any signs of damage.
> Even the break wedge seems to work perfectly. In resume, the rotor simply
> keeps this strange behaviour but, inside it, every piece seems brand new.
>
> Has anybody already experienced this kind of failure? Assuming that the
> cable is not the problem, may I suspect of a problem in the control box?
> What components should I investigate?
>
> Your advice will be much appreciated.
> 73 de Roger, PY1OL
>
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