TM 11-5840-208-30-1
(2)
Turn the RANGE SELECTOR switch to the 3750 M position to expand the sweep.
(3)
Turn the EXPANDED SWEEP DELAY switch to position 0.
(4)
Turn the MARKERS switch to ON.
Note: It may be necessary to adjust the IF GAIN control and/or local oscillator to cause
the markers to appear at the proper intensity.
(5)
Adjust the RANGE ZERO control, if necessary, until the range marker falls exactly over the strobe.
(6)
Turn the EXPANDED SWEEP DELAY switch to position 12.
(7)
Move the range strobe to 14, 000 meters.
(8)
Adjust the RANGE SLOPE control, if necessary, until the range marker appears exactly over the strobe.
Note: Since the RANGE ZERO and RANGE SLOPE controls interact, it will be
necessary to recheck slope at 14, 000 meters after each change-in zero at 2, 000
meters and to recheck zero at 2, 000 meters after each change in slope at 14, 000
meters.
2-5.
RADAR PERFORMANCE CHECKS
a. General. Upon receipt of the radar set in the unit, maintenance personnel, using the echo box in conjunction
with the indicator B-scope, should test the overall operation of the system by performing a ringtime check. The results of
this check should be entered in the radar log for future reference. Subsequently, the operator should make performance
checks daily, enter the readings in the radar log, and compare the readings with those resulting from the initial checks to
determine whether the set is operating at peak efficiency or whether its effectiveness has decreased. Because of the
difficulty of obtaining a high degree of accuracy during the measurement of ringtime, it is extremely important that the
measurements be made as carefully as possible. Preferably, all measurements should be made by the same operator.
The local oscillator must be properly tuned before the ringtime check is made.
Ringtime Check.
b.
(1)
Turn on the radar set and elevate the antenna to minimize clutter on the B-scope.
(2)
Check the MAGNETRON CURRENT meter reading to assure a reading of 18 ma.
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