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Re: AR-22 Rotor Control Box Question

Hi Jon,

Sounds like the rotor uses a contact closure to increment the
position dial on the controller.  The controller uses an AC
solenoid to move the display dial, hence the buzzing and
clicking.  Depending on where the dial is compared to where
you want it to be, the rotor moves until the two line up.
If the contacts in the rotor are dirty or otherwise making
intermittent contact, then the controller may step twice or
not at all when it should increment once, so they get out of
sync.  If you can get inside the rotor mechanism, giving the
contacts a good cleaning should fix things.

As for the control box, I built my own for automated operation
with this sort of rotor.  The design outline is posted on my
site at http://home.jps.net/~gregd/hamsite.htm; look at top
left hand box for the links.

Good luck & 73s,

Greg  KO6TH

>From: Jon Ogden <na9d-2@speakeasy.net>
>To: <amsat-bb@AMSAT.Org>
>Subject: [amsat-bb] AR-22 Rotor Control Box Question
>Date: Wed, 01 Jan 2003 19:35:16 -0600
>Howdy all,
>I've been off the air on satellites since last March when a windstorm took
>my antennas down.  I've done some reconfiguring here and now have a roof
>tower that my satellite antennas are on.  I've just finished putting up my
>VHF/UHF/Satellite antenna array and have a question about the rotor I am
>My azimuth rotor is an AR-22.  I purchased it at a hamfest for $20 and it
>certainly looks big enough to handle the load on it.  I bought a control 
>(CDE model AR-10) on E-Bay for about $5.00 so, it's been a pretty cheap
>rotor.  However, I don't like it now that it's up!
>The rotor is a 4 wire rotor and the control box is one of those that buzzes
>and clicks really loud as the antenna is turning.  And the worst part is
>that it seems horribly inaccurate.  I can line the antenna up on north or
>any direction for that matter, move the antenna back and forth a bit and 
>and all alignment is gone.  Just in the little that I have played with it,
>I've had to run outside and see where I am at.
>So, is there a better control box out there for it?  Will a better control
>box provide a more accurate pointing measurement or is the rotor just not
>that accurate either.
>I'm out very little money on this so that's not a big deal.  It's more of a
>sweat equity thing.  I would rather not get a new rotor if I don't have to.
>Just looking to see if there's a way to make this work.
>Then I have questions about why I am not picking up AO-40, but perhaps I'm
>not getting DC power to my Trans-Systems downcoverter for some reason.  But
>that's for another time!
>ps: Happy New Year to all.
>Jon Ogden
>NA9D (ex: KE9NA)
>Citizen of the People's Democratic Republik of Illinois
>Life Member: ARRL, NRA
>Member:  AMSAT, DXCC
>"A life lived in fear is a life half lived."
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