Andrew Type 183 Assembly Instructions Manual page 11

Azimuth
Use Azimuth Chart on page 13 and
determine your azimuth setting. Values
in chart must be adjusted for magnetic
deviation for your location for correct
compass reading.
Equally tighten the six azimuth
locking bolts until snug. This will
allow the reflector to rotate with slight
resistance.
Rotate reflector and mount, pointing to
the compass reading for your location.
Slowly sweep the reflector in azimuth
until signal is found. If desired signal is
not found, increase or decrease
elevation setting and repeat the
azimuth sweep. Tighten locking bolts.
Fine Tuning
Progressively tighten and torque azimuth locking bolts to 100-115 N-m (75-85 ft-lb). The four top plate locking bolts are
pre-torqued to 11-15 N-m (8-11 ft-lb). Maintain this torque until after azimuth is fine tuned.
Use a signal strength measuring device for final adjustments to obtain maximum antenna performance. Alternate between
elevation and azimuth fine tuning to reach maximum signal strength, until no improvement can be detected. Gradually tighten
(1/8 turn increments max.) top plate bolts in sequence 1st, 2nd, 3rd and 4th to 100 N-m (75 ft-lb). Observe for maximum
signal strength as elevation screws M22 locking nuts are tightened.
Polarization tune may be checked by slowly rotating feed assembly in clamp. When maximum signal strength is found,
gradually tighten clamp bolts. If a signal on the opposite polarity is available, this signal should be minimized.
Tighten and torque all hardware. Refer to Torque Chart on Page 3.
Example Depicts Azimuth Heading To 171˚
(Azimuth ± Magnetic Deviation)
1st
Top Plate
Locking
Bolt
(4 Places)
Top Plate
Pivot Bolt
Rotate Antenna
On Ground Tube
Azimuth
10
Azimuth
Adjustment
Screw
4th
3rd
2nd
Turn Nuts
Clockwise
or Counter
Clockwise For
Azimuth Fine
Tuning
Azimuth
Locking Bolts
(6 Places)
Compass