TM 11-5840-281-12-1
4-25.
GROUND ANGLE DETERMINATION. (CONT)
To use clinometer, move pointer until bubble level is approximately centered, then use vernier adjustment knob to
perfectly center bubble level.
1.
Install siting scope and clinometer on elevation antenna reflector. See Siting Scope Installation (para 4-20).
2.
Check bubble level to ensure radar set group is level.
3.
Manually position elevation antenna until clinometer reads level (zero-degree indication).
4.
Mark stadia rod at a point representing the center of the elevation horn and polarizer.
5.
Direct second person to hold stadia rod in a vertical position on td point.
6.
Loosen but do not remove six screws In three strap clamps that secure receiver-transmitter to antenna
pedestal.
7.
Site through siting scope and manually rotate receiver-transmitter until stadia rod can be seen in siting
scope.
8.
Tighten six screws loosened in step 6.
9.
Site through siting scope and manually position elevation antenna until horizontal crosshair is lined up with
point marked on stadia rod in step 4. Maintain elevation antenna in this position.
10. Adjust clinometer pointer and vernier adjustment knob until bubble is centered. Record angle Indicated on
clinometer. This is ground angle to be used in elevation cursor alinement.
4-26.
SITING OF TARGET SIMULATORS.
Reflections from radar-target simulators (target reflectors) appear on the control-indicator radar display as radar-target
returns (blips). Target simulators are used to provide fixed reference points for alining radar set group and cursors, which
are used during precision approach and height-finder operations, to the runway. Each target simulator must be
accurately sited to ensure proper alinement of radar set group and cursors. Four methods are given for siting target
simulators. Method one uses three target simulators for each runway approach. Method two requires two target
simulators for each runway approach. Method three requires the use of a theodolite or transit, and stadia rod, which are
used to site three target simulators. Method four also requires a theodolite or transit and stadia rod, but uses two target
simulators. Select the method that best suits the needs of your radar site. If more than one runway approach is to be
covered from one radar site, additional target simulators will be required, since only three are supplied with the radar set.
4-54
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