Top of Tower Mounting
Top of tower installation is similar to mast mount-
ing. (See Figure 5) Spacer washers must be used
between the rotator bottom and tower plate. This
allows the rotator housing bolt heads to clear the
tower plate. The tower plate must be drilled in
four (4) places using the template provided with
this manual, unless already pre-drilled. A large
hole must also be drilled or cut for control cable
access.
Inside Tower Mounting
The rotator is mounted inside a tower to a flat
rotor-plate by means of four (4) bolts furnished in
the hardware kit. Locate the rotator in the tower
directly under the thrust bearing or mast guide
tube Spacer washers must be used between the
rotator bottom and rotor plate. This allows the
rotator housing bolt heads to clear the rotor plate.
The rotor plate must be drilled in four (4) places
using the template provided with this manual, un-
less already pre-drilled. A large hole must also be
drilled or cut for control cable access.
Tighten the four bolts, but not to the final tight-
ness. Observe how the rotator turns. It must rotate
the mast within the thrust bearing or guide tube
without binding. If binding occurs, either move
the rotator slightly on the rotor plate, or add
shims between the mast and the upper mast
support. The maximum O.D. of the mast is 2
1/16". After centering the mast, tighten the four
mounting bolts to the rotor plate. Install the
antenna on the upper mast, pointing South. The
feedline rotation loop should allow for complete
CCW rotation. Secure the feedline and control
cable to the tower for strain relief.
Grounding
Metal towers or masts must be grounded properly
at the tower location before the tower or mast is
erected. This is to minimize electrical hazard and
the possibility of lightning damage. Do not bury
bare aluminum wires or stakes in the ground. Use
8 foot copper-clad ground stakes and No. 10 cop-
per wire for best results.
Figure 5 Rotator Mounting on a Tower
Top Plate
Figure 6 Rotator Mounting in a
Tower
