TM 11-5840-281-12-1
4-27.
PRELIMINARY SERVICING AND ADJUSTMENT. (CONT)
6.
Site through siting scope and slowly rotate azimuth antenna toward O-degree mark on azimuth protractor. Be
sure that furthest td bracketing reflector or runway clr reflector (whichever is used) and td point are within the 14-
to O-degree scan area. Radar set group is now oriented to runway for operation with azimuth precision scan of
15 degrees left to 15 degrees right of rpl.
NOTE
If the conditions in step 6 cannot be met, or if an azimuth scan other than 15 degrees left to 15 degrees
right of rpl is required, perform steps 7 through 14 to offset scan.
7.
Manually rotate azimuth antenna toward runway until 14-degree mark is indicated on azimuth protractor.
8.
Loosen, but do not remove, six screws in three strap clamps that secure receiver-transmitter to antenna pedestal.
9.
Rotate receiver-transmitter until vertical crosshair of siting scope is centered on td bracketing reflector furthest
from radar set group. If clr target reflector is used instead of bracketing target reflector, direct second person to
hold stadia rod in vertical position on td point. Rotate receiver-transmitter until vertical crosshair of siting scope
is lined up with stadia rod.
10.
Tighten six screws loosened in step 8.
11.
Manually rotate azimuth antenna until vertical crosshair of siting scope is centered on rpl target reflector.
12.
Verify that indication on azimuth scan protractor is 10 degrees or less.
NOTE
If indication on azimuth protractor is 10 degrees or less, skip steps 13 through 16 and proceed to step 17.
If azimuth protractor indication is greater than 10 degrees, perform any one or more of steps 13 through
16 below and repeat this procedure, beginning with step 7.
13.
Relocate bracketing td reflectors closer to runway. Do not place closer than 75 feet (22.9 m) from clr.
14.
Move radar set group further back from td point along rpl.
NOTE
If step 15 below is performed, td bracketing reflectors also must be moved to bracket td point.
15.
Move td point closer to approach end of runway (away from radar set group). Do not relocate closer than 775
feet (236 m) from end of runway.
16.
Reposition radar set closer to clr. Do not place closer than 100 feet (31 m) from clr.
17.
Remove siting scope and store in transmitter door.
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