16
16
Antenna Pointing
NOTE: The Reflector contains a 23 degree offset look angle. Therefore, when the face of the reflector looks perpendicular
to the ground, the antenna is actually looking 23 degrees in elevation.
The antenna look angle is actually the top side of the Feed Support Plates as shown below.
FOR FIXED MOUNT POINTING-
.
1. Adjust the reflector up or down in elevation by turning the two 2” hex nuts on the Elevation Rod Assembly until the
desired elevation is measured (taking Elevation angle measurement from the Feed Support Arms).
4. Patriot recommends the use of cross pol nulling using a spec-
trum analyzer during TX/RX installations. After tightening the
azimuth and elevation hardware, peak the co-pol signal using
the spectrum analyzer. Then rotate the feed assemble roughly
90 degrees to obtain a cross pol null. Fine tune the null. The
scale on the feed horn can be used with the tick mark on feed
holder top or the seam between feed holder top and bottom. The
tick mark and seam are 90 deg. apart.Note that changes may be
necessary to the resolution and video bandwidth to bring the
signal above the noise floor. Note the angle of optimum cross
pol null. Rotate the feed back exactly 90 degrees and tighten the
feed clamp.
2. Azimuth Adjustment: With the electronics set to acquire the satellite, use the double-nut threaded adjustment on the
Azimuth Rod.
NOTE: If signal is not found on first pass of Azimuth, adjust elevation up
or down in 2 deg increments until signal is found.
3. Peak the satellite signal by fine adjustments made in both azimuth
and elevation until the optimum signal is achieved.
Note: Adjust, tighten, recheck until optimum signal is reached in
both Azimuth and Elevation.
Inclinometer
Focal
Axis
Inclinometer
Should read 0 degrees when
feed booms are parallel to earth
Focal Axis
(Parallel to
feed boom)
Summary of Contents for 2.4m Offset Antenna
Page 1: ...2 4m Offset Antenna Receive only and Transmit Receive...
Page 19: ......
