TM 11-5840-208-30-1
(3)
Operate the ELEVATION switch. The reflector should tilt up-ward when the switch is placed in the
RAISE position; it should tilt downward when the switch is placed in the LOWER position.
f.
After the 5-minute delay, the READY indicator lamp on the control-power supply panel will light. Close purge
valve. Check to see that the dehydrator pressure gage reads approximately 16 psi (pounds per square inch) and that the
dry air indicator is blue.
g. Adjust the MAGNETRON POWER variac to a position between 0 and 25. Press the START button. The
RADIATE indicator lamp will light. Adjust the variac until the MAGNETRON CURRENT meter reads 18 ma (milliamperes).
h.
Set the VIDEO control at maximum and the IF GAIN at minimum.
i.
With the RANGE SELECTOR switch in the 15000 M position, adjust the INTENSITY control until raster is just
visible.
j.
Switch the RANGE SELECTOR switch to the 3750 M position. If intensity of raster changes noticeably,
adjust the intensity balance (page 208).
k.
Adjust the FOCUS control to obtain the sharpest lines and images.
l. Adjust the IF GAIN control until the background noise is just noticeable.
m.
Adjust the RANGE MARK control until the range strobe is visible.
n.
Adjust the AZIMUTH MARK control until the azimuth strobe is visible.
o.
Place the AFC-MANUAL switch in the AFC position.
p. Turn the MARKERS switch to ON. Range markers should appear at ranges of 2,000, 4,000, 6,000, 8,000,
10,000, 12,000, and 14,000 meters. If the markers do not appear, the most probable cause is improper tuning of the local
q.
Tune the local oscillator.
(1)
Place the AFC-MANUAL switch in the MANUAL position.
(2)
If the markers did not appear in above, operate the LO switch in the RAISE position until the markers
appear. If no markers appear within 40 seconds, operate the LO switch in the LOWER position.
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