TM 11-5840-281-12-1
4-27. PRELIMINARY SERVICING AND ADJUSTMENT. (CONT)
INSTALLING PRESELECTOR FILTERS (CONT)
14.
On receiver-transmitter main power panel, place MAIN POWER and HV switches to ON.
15.
On transmitter control panel, place all four switches to ON.
16.
On receiver-transmitter, disconnect flexible waveguide from azimuth directional coupler (1) and connect Echo
Box TS-488( )/UP (2) to azimuth directional coupler.
17.
Dial In assigned transmitter frequency on echo box.
18.
On transmitter control-indicator, press HV READY-HV ON switch to light HV ON and wait 5 to 7 minutes to allow
magnetron to settle.
19.
Adjust TUNING control on echo box for maximum deflection ring time on echo box meter.
20.
Direct second person to place POWER circuit breaker on control-indicator to ON.
21.
Direct second person to adjust FOCUS and INTENSITY controls on control-indicator until a faint but discernible
sweep is visible on crt.
22.
On receiver, rotate LOCAL OSC ADJ control (usually painted red) until maximum ring time is observed on crt at
control-indicator site (rotating LOCAL OSC ADJ control clockwise increases frequency of local oscillator,
counterclockwise rotation decreases frequency).
23.
On receiver, press and hold LO TUNE REMOTE/LOCAL switch and adjust LO TUNE adjust control until
maximum ring time Is observed on crt at control-indicator site.
24.
On local control monitor, set LOCAL/REMOTE switch to IND position.
25.
On transmitter control-indicator, press CONTROL switch to light REMOTE.
26.
Remove headset from INTERCOM jack on receiver.
27.
Close and lock receiver and transmitter doors.
4-80
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