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Discussion Starter · #1 ·
I am sorry to post this here. I posted it in two places on the AVS forum and have not gotten any response, so I am hoping someone here knows or can check for me.
This relates to OTA on HR20, so not totally out of place. :)
I think my rotor controller is bad but I have no way to be sure...however, I put a meter across each post combination possible with the rotor turning both directions, and I got 25-30 volts no matter which posts I was touching and no matter which way it was turning.
It seems to me that the wide wire is a common wire and that the other two posts would only be live depending on which way the dial is turning. Am I wrong about this?
Anyone have a chance to slap a meter on their rotor and check I sure would like to know.
Thanks,
and sorry again for placing this where it really kinda doesn't belong.:lol:
 

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the lines are a/c.. they use 2 sycro motors (that keeps the indicator in sync) they are pretty screwy in operation..
 

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Housekamp is correct - synchros can be screwy. You will measure voltage across both the stators and the rotors while the unit is in motion - otherwise the synchros wouldn't be synchros (it is this voltage which induces movement). When at rest, you should see 0 volts across the stators and 1/3 of the line voltage across each of the rotors. So, long story short, what do you see when the antenna is at rest?
 

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Discussion Starter · #4 ·
dechief4 said:
Housekamp is correct - synchros can be screwy. You will measure voltage across both the stators and the rotors while the unit is in motion - otherwise the synchros wouldn't be synchros (it is this voltage which induces movement). When at rest, you should see 0 volts across the stators and 1/3 of the line voltage across each of the rotors. So, long story short, what do you see when the antenna is at rest?
Okay, I guess I am confused. I am measuring the voltages at the controller. There are three posts -- labeled 1, 2, and Wide Wire.
Okay so what voltage should I get over 1 and 2, 1 and Wide, 2 and Wide when the rotor is turning? How about when it is at rest? If these three posts correspond to the stators and rotors, which is which?

The whole problem is that something is wrong with the rotor system. The antenna is in a very difficult location to reach and replacing the rotor on the antenna itself would require hiring someone.
So I am first trying to be sure that the problem is or is not with the controller before I worry about the rotor itself.
Thanks,
Dave
 

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deebeeeff said:
Okay, I guess I am confused. I am measuring the voltages at the controller. There are three posts -- labeled 1, 2, and Wide Wire.
Okay so what voltage should I get over 1 and 2, 1 and Wide, 2 and Wide when the rotor is turning? How about when it is at rest? If these three posts correspond to the stators and rotors, which is which?

The whole problem is that something is wrong with the rotor system. The antenna is in a very difficult location to reach and replacing the rotor on the antenna itself would require hiring someone.
So I am first trying to be sure that the problem is or is not with the controller before I worry about the rotor itself.
Thanks,
Dave
Ah -OK, so you weren't measuring at the rotor itself... That does change things. The control signals will be split at the rotor to move the antenna. Unfortunately, without being able to see the schematics for your particular setup, I won't be able to answer your question directly. What are the exact symptoms you are experiencing now (sorry - can't look back to see what you wrote previously as I type this response)?
 

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Discussion Starter · #6 ·
dechief4 said:
Ah -OK, so you weren't measuring at the rotor itself... That does change things. The control signals will be split at the rotor to move the antenna. Unfortunately, without being able to see the schematics for your particular setup, I won't be able to answer your question directly. What are the exact symptoms you are experiencing now (sorry - can't look back to see what you wrote previously as I type this response)?
Exact: Rotor doesn't turn.
Also, when one moves the controller "pointer" in either direction, the controller starts to move but the pointer moves with it in stead of staying where it was pointed to, so it never gets to where it was pointed to until every thing stops at North.

The controller I have is what I thought was a rather common three wire system, with one "wide wire" screw terminal and two other terminals labeled 1 and 2.
My assumption is that the wide wire is a common lead and that 1 and 2 are the directional leads, in which case only one or the other, depending on the direction you are turning, should have voltage. But, in fact, they both have voltage no matter which way you are turning the controller.

Thanks for your kind assistance.
Dave
 

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deebeeeff said:
Exact: Rotor doesn't turn.
Also, when one moves the controller "pointer" in either direction, the controller starts to move but the pointer moves with it in stead of staying where it was pointed to, so it never gets to where it was pointed to until every thing stops at North.

The controller I have is what I thought was a rather common three wire system, with one "wide wire" screw terminal and two other terminals labeled 1 and 2.
My assumption is that the wide wire is a common lead and that 1 and 2 are the directional leads, in which case only one or the other, depending on the direction you are turning, should have voltage. But, in fact, they both have voltage no matter which way you are turning the controller.

Thanks for your kind assistance.
Dave
Have you verified the antenna itself isn't physically caught on something preventing it from moving? From your description, it sounds like the mountings themselves may be slipping.
 

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Discussion Starter · #8 ·
dechief4 said:
Have you verified the antenna itself isn't physically caught on something preventing it from moving? From your description, it sounds like the mountings themselves may be slipping.
Ahhh we are back to the curx of the problem. Determining that requires hiring someone to go up there and check. And that someone has to be experienced enough to know how to walk on a tile roof that is rather steep and unique - a wrong step can cause the tiles to crack and the roof to leak. This is why I am trying to be sure it isn't the controller first.
 

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Just for reference, I have the CM 9521 rotator. The first one, mounted in the attic, died within the warranty period, so I returned it and got a new one. That one started out in the attic and later was moved to the chimney. It lasted for 3-4 years and died about a year ago. I live in San Diego, so even being outside, it doesn't get much bad weather, just mostly rain in the winter.

I think that rotator technology is pretty old and mechanically I don't think that they're that reliable.
 

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deebeeeff said:
Ahhh we are back to the curx of the problem. Determining that requires hiring someone to go up there and check. And that someone has to be experienced enough to know how to walk on a tile roof that is rather steep and unique - a wrong step can cause the tiles to crack and the roof to leak. This is why I am trying to be sure it isn't the controller first.
?? It's in a place you can't even see if it's trying to turn? You haven't described how/where your antenna is mounted. Without knowing your circumstances, I find it a little strange you can't even see it, ifyouknowwhatImean... Even if it's on the roof, standing a bit back from the house with a decent pair of binoculars while someone turns the control would give you some idea of what is happening, I would venture to guess (heck, you could probably turn the controler 360 degrees - from North to North - and have time to run outside to see what it's doing :) ). If it's in the attic, same idea, more or less... More details, please. Simple questions, but important to try to help you diagnose the issue.
 

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Discussion Starter · #11 ·
dechief4 said:
?? It's in a place you can't even see if it's trying to turn? You haven't described how/where your antenna is mounted. Without knowing your circumstances, I find it a little strange you can't even see it, ifyouknowwhatImean... Even if it's on the roof, standing a bit back from the house with a decent pair of binoculars while someone turns the control would give you some idea of what is happening, I would venture to guess (heck, you could probably turn the controler 360 degrees - from North to North - and have time to run outside to see what it's doing :) ). If it's in the attic, same idea, more or less... More details, please. Simple questions, but important to try to help you diagnose the issue.
LOL - no , sorry. Yeah I can see if it is trying to turn and from all appearances it is not.
 

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deebeeeff said:
LOL - no , sorry. Yeah I can see if it is trying to turn and from all appearances it is not.
OK... Hate to tell you this, but I think we've come full circle. Sorry. It is important for you to verify if the antenna tries to move at the very first moment you activate the controller. If it nudges even a little, this would probably indicate a problem with either the mounting hardware and/or that the antenna is physically restricted from moving. If there is no movement, and again, basing this without seeing the schematics for your unit, if the voltage is identical (amplitude and polarity) between the two control wires and ground regardless of attempted direction of movement, I would surmise the problem is in the control unit and not the rotor. Wish I could help more...
 

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Discussion Starter · #13 ·
dechief4 said:
OK... Hate to tell you this, but I think we've come full circle. Sorry. It is important for you to verify if the antenna tries to move at the very first moment you activate the controller. If it nudges even a little, this would probably indicate a problem with either the mounting hardware and/or that the antenna is physically restricted from moving. If there is no movement, and again, basing this without seeing the schematics for your unit, if the voltage is identical (amplitude and polarity) between the two control wires and ground regardless of attempted direction of movement, I would surmise the problem is in the control unit and not the rotor. Wish I could help more...
Your help has been greatly appreciated. Thanks!:)
 
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