[amsat-bb] Re: Ham IV rotor problem

Jim Jerzycke kq6ea at verizon.net
Wed Jan 5 12:59:24 PST 2011

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 appreciated.
> Thanks much.
> Craig
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