You rotate the antenna in one direction and the other. If the rotor stops turning but the box stays lighted, you have to work the lever until the light goes out.
There is a mechanical stop inside the rotor that limits the turning to almost exactly degrees. This would be very difficult, if at all possible, to duplicate with solid-state components. But, there are only six ball bearings, not the 96 that the HAM-M had. However, back during the late s and early s, there were lots of AR rotors used to turn tri-band yagis and, especially, quads. Works great! The only thing that I have had to do over the years is replace the starting capacitor in the control box a couple of times.
Glen, K9STH. K9STH , Oct 20, It was a 5 wire rotor, and used an analog meter to show direction. The clockwork mechanism has a split grounding terminal that grounds the appropriate winding of the rotor so that the rotor is rotating the same direction of the indicator. Internal to the rotor housing, there is a cam-driven switch. As the motor rotates approximately every 6 degrees, the cam actuates the switch and through it, power is applied to terminal 2 of the motor and controller terminal strip.
It appears that this voltage is approximately 18vac. This voltage is applied to a solenoid-operated cog mechanism located within the controller housing that allows the indicator dial to step towards the pointer knob at a predetermined rate that should be equivalent to the rotation of the rotor motor.
The other side of the solenoid is grounded, so as the rotor motor rotates each 6 degrees, it applies power to the position wire Terminal 2 , activating the solenoid and releasing the cog wheel and allowing the indicator dial to turn against the spring tension applied to it.
Each activation of the solenoid will allow one cog position to index, and this will continue in the desired direction until the indicator dial and the pointer knob line up, at which time the commutator switch contacts open, removing power from the controller and motor. Some simple troubleshooting would include: If motor doesn't turn - Check Starter Capacitor - motor will be weak or inoperative if it is defective. Indicator dial not rotating: - Defective spring-driven mechanism or binding - check for free operation.
With power removed and pointer knob moved to one side or the other of the dial indicator, you should be able to manually index the pointer by pressing in the solenoid actuator - stepping through it one cog at a time until the pointer and dial align at the desired setting.
A couple of observations regarding the rotor motor: - There are two rows of 6 bearings each. Ham 3 Rebuilt - 1 year warranty, rated at Ham 3 Control Only with BD brake delay installed. Telex, Hygain. Ham 2 Rotor and Control - 1 year warranty, rated at 10 sq. Ham 2 Control Only with BD brake delay installed.
Click for more info. Ham M Rebuilt - 1 year warranty, rated at 10 sq. Supplied with one set of mast clamps only. For a second set of mast clamps to mount on a mast see below. Supplied with one set of mast clamps for tower mounting. For a second set of mast clamps for mast mounting - see below.
NOT required for tower mounting. CD Rotor and Control - 1 year warranty, rated at 7. BT-1 Rotor and Control - 1 year warranty, rated at 5 sq. BT-1 Control only - Manual or automatic operation. Manual operation by turning compass dial to desired setting.
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