TABLE OF CONTENTS
SECTION
DESCRIPTION
PAGE
1.0 INTRODUCTI0N
...................................................................................................................
1.1 Technical
Description...................................................................................................
1.2 Specifications ..............................................................................................................
2.0 INSTALLATION AND SET-UP
..............................................................................................
2.1 General .......................................................................................................................
2.2
Installation to Vehicle ...................................................................................................
2.3 Controller
Installation ...................................................................................................
2.4
Controller / Positioner Verification Tests ........................................................................
2.5
Elevation Stow Switch Verification ................................................................................
2.6
Final Calibration of System...........................................................................................
2.7 LNA/LNB
Installation ....................................................................................................
3.0
AZIMUTH POSITIONING SYSTEM
.......................................................................................
3.1 Azimuth
Bearing ..........................................................................................................
3.2 Azimuth
Gear
.............................................................................................................
3.3 Azimuth
Motor .............................................................................................................
3.4 Azimuth
Roto-Lok Cable Drive ......................................................................................
3.5
Azimuth Position Feedback ..........................................................................................
3.6
Azimuth Stow and Limit Switches..................................................................................
4.0
ELEVATION POSITIONING SYSTEM
...................................................................................
4.1
Elevation Gear Box ......................................................................................................
4.2 Elevation
Motor ...........................................................................................................
4.3 Elevation
Roto-Lok Cable Drive ....................................................................................
4.4
Elevation Position Feedback.........................................................................................
4.5 Elevation
Stow and Limit Switches ................................................................................
5.0
FEED AND POLARIZATION SYSTEM
................................................................................. 5
5.1 General .......................................................................................................................
5.2 Feed
Assembly............................................................................................................
5.3 Polarization
Drive ........................................................................................................
5.4
Polarization Position Feedback.....................................................................................
6.0 RF WAVEGUIDE AND ELECTRICAL CABLE SYSTEM
........................................................
6.1 Waveguide
System......................................................................................................
6.2 Control
Cable ..............................................................................................................
6.3
RF and Auxiliary Cables ...............................................................................................
7.0
MAINTENANCE
...................................................................................................................
7.1
Annual Inspection ........................................................................................................
7.2
Spare / Replacement Parts List ....................................................................................
8.0
WARRANTY
........................................................................................................................
5.0 FEED AND POLARIZATION POSITIONING SYSTEM
5.1 GENERAL
The feed assembly consists of the feed boom, feed housing, RF components and polarization drive.
The feed pivots about the elevation axis to eliminate additional flex-guide required when pivoting at the
edge of the reflector. The pivoting is facilitated by the double bearings of the rotary joint and the delrin
pivot. The elevation to polarization waveguide runs along the feed boom tubing. The feed / OMT is
rotated by a chain drive and 12V DC motor.
5.2 FEED ASSEMBLY
The feed assembly consists of a feed horn and OMT. The feed / polarization drive box is mounted to
the feed assembly. The feed horn is mechanically positioned with a template within 1/8” of the
theoretical focal point of the reflector. This positioning assures the RF system provides the gain and
FCC compliance as stated in the specifications.
5.3 POLARIZATION DRIVE
The polarization drive motor is a 12V DC gear motor. It is housed in a polarization box, which attaches
to the feed assembly itself. Since the worm gear drive will not backdrive, no brake is required.
5.4 POLARIZATION POSITION FEEDBACK
The polarization position feedback is produced by a 3 turn, 5K ohm potentiometer driven by the chain
drive with small spur gears. The resolution and accuracy is 0.3°. The potentiometer is rated for IP 65
environment – wind, rain, dust, etc. (Figure 5.1)
Figure 5.1
The potentiometer is mechanically set at the one-half travel position (2500 ohms) when the stow
switch is actuated. The controller may also electrically zero the potentiometer. See section 4.1 of the
Controller manual.
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