Re: [amsat-bb] TV aerial rotator question

[Sil - PA3HIL <pa3hil@xxxxxxxxx>]

Phil

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>I have discovered a TV aerial rotator in a mail-order catalogue. It is
>described as a model AR300XC and uses a three wire cable to connect to
>My question is, do these rotators have a feed-back pot? A three wire cable
>makes me think that this is unlikely.


Nope. All the 3 wire ones I've seen, have a second motor in the control 
box, moving the pointer mechanism. This motor (well... the geared down 
pointer) rotates at the same speed (more or less) as the antenna. It's the 
second motor mechanism that cuts the power when the desired direction is 
reached. You'll find that you have to drive them "stop-to-stop" regularly 
to keep them controller and the rotator in step. There's always a large 
"pointing" angle error with these things.


Sil - PA3HIL

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