AlfaSpid Rotator
www.alfaspid.com
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Page 16 of 23
A
lfa Radio Ltd. 11211 - 154 St. Edmonton, Alberta, Canada T5M 1X8 780 466 5779
Be careful not to over wind your coax with the next test, as there will be no
protection from over turning.
Find a small 12 volts supply which will deliver 3 to 4 amps. ( a small 12 Volt battery
will work just fine )
To confirm that the motor runs you may connect 12 volts D.C. to the lines that go to
the motor, pins 1 and 2, it should turn. Reversing the 12 Volts D.C. should cause
the motor to turn in the reverse direction.
To confirm that the sense circuit in the rotator is working, connect an ohm meter to
the senses lines pins 3 and 4, apply 12 volts to the motor lines pins 1 and 2; you
should see the ohm meter reading alternate between open circuit and about 1200
ohms.
Pin on Rotator not
controller Typical
Reading
Your
reading
Pins 1 to 2
About 2 to 4 Ohms
________
Depends on the length of
wire to rotator
Pins 3 to 4
Open or 1200 Ohms
________
Depends on the status of
the read switch
Pins 1 to 3
Open
________
Pins 2 to 3
Open
________
Pins 2 to 4
Open
________
________
Pin 1 to Ground
Open
________
Pin 2 to Ground
Open
________
Pin 3 to Ground
Open
________
Pin 4 to Ground
Open
________
________
Voltage on controller
Pins 1 to 2
About 12 volts with motor running
Depends on the supply
voltage (14 volt applied)
Pins 3 to 4
About 8.5 volts or 2.5
volts *
Depends on the status of
the read switch
and the Supply voltage
