TM 11-5840-281-12-1
4-27. PRELIMINARY SERVICING AND ADJUSTMENT. (CONT)
5.
Manually tilt elevation antenna to top dead center of scan and adjust clinometer to indicate 20.6 degrees. Verify
that clinometer bubble is centered.
NOTE
If clinometer bubble is not centered, perform step 6. If bubble is centered, skip step 6 and
proceed to step 7.
6.
On elevation antenna drive (4), loosen two locknuts (5) and adjust length of elevation antenna shaft (6) until
clinometer bubble level is centered. Tighten two locknuts, making sure clinometer bubble remains centered.
NOTE
If adjustment in step 6 cannot be accomplished, refer to higher category of maintenance for
complete realinement of 10- to 35-degree actuator.
7.
Remove clinometer from elevation antenna clinometer mount and store in transmitter door. INSTALLING
PRESELECTOR FILTERS
Preselector filters are checked after Initial turn-on procedure has been performed. Before checking preselector filters,
the assigned transmitter frequency must be obtained. Refer to current local standard operating procedures (SOP) to
obtain the assigned transmitter frequency. This procedure requires two personnel: one person Is stationed at control-
indicator site and the other at receiver- transmitter site. Headsets are connected to HEADSET jack on pulse generator
and INTERCOM jack on receiver to provide communication between personnel. Echo Box TS-488( )/UP Is needed to
adjust transmitter frequency once proper preselector filters have been Installed.
4-77
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