TM 11-5840-281-12-1
2-4. SEARCH OPERATION. (CONT)
1.
Place SCAN MODE switch (1) to SEARCH position.
2.
Place SCAN switch (2) to ON position.
3.
Place RANGE MILES switch (3) to any desired position.
4.
Adjust IF GAIN AZ control (4) clockwise until receiver noise (grass) is visible in background of crt display (5).
5.
Place BITE-AZ TILT switch (6) to AZ TILT position.
6.
Place ANTENNA switch (7) in either U or D position to adjust angle of the azimuth antenna.
7.
Monitor the tilt angle of the azimuth antenna on AZ TILT/BITE meter (8).
8.
When necessary, place STC switch (9) to ON position to reduce the amplitude of return signals at close range.
CENTERING VIDEO DISPLAY
1.
Place PPI CENTERING NORM-OFFSET switch (10) to NORM position.
2.
Adjust PPI CENTERING HORIZ control (11) to center display horizontally.
3.
Adjust PPI CENTERING VERT control (12) to center display vertically.
OFFSETTING VIDEO DISPLAY
Use offset centering feature to extend the range when greater radar video resolution is desired at or near maximum
range of display. To offset center of crt display (5), perform the following.
1.
Place PPI CENTERING NORM-OFFSET switch (10) to OFFSET position.
2.
Adjust PPI CENTERING HORIZ control knob (13) to position display horizontally.
3.
Adjust PPI CENTERING VERT control knob (14) to position display vertically.
4.
Place PPI CENTERING NORM-OFFSET switch (10) to NORM position after the display is offset.
VIDEO CLUTTER
Video clutter is a blanketing effect displayed on the crt display caused by radar return signals from objects other than the
target being tracked. Clutter can be caused by nearby large objects or distant terrain (ground returns) and rain, snow, or
fog (precipitation). When tracking through video clutter, care should be exercised when using the controls and switches,
so that the return signal from the target being tracked is not lost. Range of target and amount of clutter have to be taken
into consideration when selecting the controls to track the target. It is at the discretion of the operator to select the
controls that best suit his or her needs. Examples of video clutter that may be encountered during search operation and
ways to reduce it are shown on the following page.
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