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Originally Posted by Pete Higgins
I’m not sure that the programmable “digital display” 3-wire rotors employ two synchronous motors (one in the control and one on the mast).
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Yes, I'm not sure either.
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From what I’ve been able to gather, the control unit has a counting or “timing ckt.” that calibrates itself to the time of travel from 360 deg. to 0 deg...
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The well-known Channel Master rotator and clones essentially use the synchronous motor in the control as a timer. So, it could be in newer units that a timing function is implemented in a smaller or less costly circuit.
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When it gets really badly out of sync,...I’ve had the digital display read over 40 before reaching the CW end of the rotors travel. ...
I do hear a slight hum ...that sounds like a good indoor project on these 100 deg. days.
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Yes, for the curious mind there is always a project.
Seems unlikely that a timing motor would be used with a digital indicator, when a timing circuit could be smaller and probably less expensive.
I haven't used, or looked at circuits of, any of the newer digital indicator rotators, so my comments are speculation.