Disconnect the wires at terminals 3 and 7 from the control box and
the resistance between them. It should read 500 ohms. ( If it is open,
a break in the potentiometer or the control cable.)
You can use an ohmmeter to determine position by measuring the resistance
between either wire and ground which is a good trick if one side is open.
This trick can be used on all HAM series rotors.
de Tom - N4KG
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