[amsat-bb] Re: Ham IV rotor problem
morsesat at optonline.net
Wed Jan 5 13:17:57 PST 2011
Test it with an external 500 ohm pot with clip leads to the indicator and
then at the rotor end before disassembly. If this has been up for a while,
check your cabling. Mine has been up a while and I have to replace
it(cable) going to my main HF beam. Good luck and let the BB know what you
found ...! Sometimes, we think someone fell off a tower and never hear
about a successful repair...(HA!) Wear a climbing belt, please!!
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Jim Jerzycke
Sent: Wednesday, January 05, 2011 3:59 PM
To: D. Craig Fox
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Ham IV rotor problem
Sounds like the potentiometer inside the rotor housing has died, a common
thing with these rotors.
IIRC, it's a 500 Ohm wire-wound pot, with the winding connected between pins
3 and 7, and the wiper tied to the ground pin, #1.
You can get a manual for it here:
On 01/05/2011 08:26 PM, D. Craig Fox wrote:
> Greetings and happy new year to my fellow sat-ops. I thought I would try
here before searching the entire 'net, for some tips in trouble shooting a
rotor problem. My up/down link sat antennas are mounted on a common boom,
fixed el., above my HF yagi. I turn all of it with a very old Ham IV rotor
and the original CDE controller. Here is the problem. The rotor turns fine,
but there is no readout of direction. This first began to occur
intermittently, then finally the needle just stopped moving while turning
the antennas. I have checked the wiring at both ends and all seems in
order. I am really hoping to avoid having to tear down the rotor, so any
suggestions on trouble shooting from "outside the case" would be greatly
> Thanks much.
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