TM 11-5840-281-12-1
1-15.
COMPONENT PRINCIPLES OF OPERATION. (CONT)
AZIMUTH AND ELEVATION ANTENNA DRIVES
The azimuth and elevation antenna drives provide the mechanical drive power to rotate the azimuth and elevation
antennas through their respective scans. When the radar set is operated in the SEARCH, SIMULT, or IFF modes, the
azimuth antenna drive rotates the azimuth antenna through 360 degrees in azimuth at approximately 16 revolutions per
minute. The elevation antenna is not used during SEARCH or IFF modes, but in SIMULT mode the elevation antenna
drive will provide the drive power to drive the elevation antenna up and down through 11 degrees in elevation.
When the radar set is operated in the NORM (precision approach) mode of operation, both the azimuth and elevation
antennas are scanning. The azimuth antenna drive will move the azimuth antenna back and forth through a 30-degree
sector scan in azimuth. At the same time, the elevation antenna drive will provide the drive power to move the elevation
antenna up and down through 11degrees in elevation.
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