[amsat-bb] Re: Ham IV rotor problem

Scott Armstrong em12pt at hotmail.com
Wed Jan 5 13:01:45 PST 2011

Hi Craig,
I've attached a copy of the HamIV  manual. Let me know if you get it OK.  It has some troubleshooting info towards the back.
>From your problem description, my bet is that the sweeper arm on the  potentiometer inside the rotor is no longer making contact. I've had several wear out over the years.
Of course, this is the worse case scenario requiring the rotor to be removed and disassembled.
However, you might get lucky and find something in the control box power supply has failed or an open/intermittent in the cable between the control box and rotor. 
Good Luck,
Scott AA5AM


> From: DFox at rwglaw.com
> To: amsat-bb at amsat.org
> Date: Wed, 5 Jan 2011 12:26:13 -0800
> Subject: [amsat-bb] Ham IV rotor problem
> 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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