TM 11-5840-281-12-1
2-5. PRELIMINARY OPERATING PROCEDURE. (CONT)
18.
Adjust LO TUNE controls (14) to increase radar video.
19.
Readjust FOCUS control (15) for best overall definition.
20.
To reduce receiver noise (grass) in background, rotate IF GAIN AZ controls (16) slightly counterclockwise.
Tuneup Procedure
Initial tuning of the receiver-transmitter is accomplished by maintenance personnel. By utilizing the controls on the
master control-indicator, the operator can make fine tuning adjustments to compensate for frequency drift. The radar set
must have been alined by maintenance personnel before performing the tuneup procedure below.
21.
Check that TRANSMITTER switch (17) is in WIDE PLS position.
22.
Check that HV ON indicator (18) is lit and equipment is stabilized (allow minimum of 2 minutes).
23.
Place EL TARGET control (19) to WIDE position.
24.
Place FTC switch (20) to OFF position.
25.
Place STC switch (21) to OFF position.
26.
Rotate IF GAIN AZ control (16) fully clockwise.
27.
Rotate IF GAIN EL control (22) fully clockwise.
28.
Place SCAN MODE switch (23) to SEARCH position.
29.
Place ANTENNA switch (24) to U or D position to obtain any ground return at long range.
30.
Place SCAN switch (25) to OFF position, stopping the azimuth antenna on the ground return.
31.
Adjust LO TUNE control (14) to obtain maximum ground return signal on crt display.
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