[amsat-bb] Re: Ham IV rotor problem

H. Vordenbaum tower2 at stx.rr.com
Wed Jan 5 17:36:07 PST 2011

I had the wiper arm actually break off once years ago.
73, K5HV

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Scott Armstrong
Sent: Wednesday, January 05, 2011 15:02 PM
To: dfox at rwglaw.com; amsat-bb at amsat.org
Subject: [amsat-bb] Re: Ham IV rotor problem

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
> Thanks much.
> Craig
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