5
screw terminals are, numbers associated with the four terminals of the rotor. These numbers
are molded into the aluminum casting of the adjacent case. Pin 1 on the azimuth rotor goes to
pin 1 of the controller terminal block, 2 to 2, 3 to 3 and 4 to 4. The four wires to the elevation
rotor consecutively go to pins 5- 8 of the terminal block: pin 1 of the elevation rotor goes to pin
5 of the terminal block, 2 to 6, 3 to 7 and 4 to 8 respectively.
You have a number of choices for cabling the rotors. For example, you can use two
four-conductor cables, one for each rotor, or you can use a single 7- or 8-conductor cable.
Whichever option you choose, we recommend you select stranded wire cables rather than
cables with solid-core wire. Stranded wire is more reliable in this situation where the wires
may be “worked” as the controller box is moved, possibly breaking the solid conductor. If you
decide to use solid core wire be careful to avoid nicking the wire when stripping its insulation.
If you choose to use two 4-conductor cables, we recommend against using the common
4-conductor solid-core wire used for telephones. Such wire (typically 24 gauge) is a bit light for
this application, and as mentioned above we recommend stranded wire. The conductors in the
cable should be of 18 to 22 AWG. Strip and tin each cable wire end to prevent fraying and
possible shorts.
You can choose to use a single 7- or 8- conductor cable. A 7-conductor cable can be
used because the ground wire is common to the two rotors because each rotor has a common
‘ground’ terminal: terminal 3. That is, a single wire in the cable connected to either controller
ground terminals 3 or 7 can go to both azimuth rotor terminal 3 and elevation rotor terminal 3.
The cable to the elevation rotor is conveniently routed through the center hole of the
vertical “T” coupler mast that joins the two rotors. This will prevent the elevation rotor cable
from getting tangled with antennas or other nearby structures.
The terminal connections are summarized in the table below.
Table of Terminal Connections
Controller terminal Az. rotor terminal
El. rotor terminal
1 1
2 2
3
3 (ground)
4 4
5 1
6 2
7
3 (ground)
8 4
You will also need a connection from the nine-pin connector along the bottom edge of
the controller board to your computer’s serial port. A standard nine-pin female to nine-pin male
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