QUESTION:
When you rotate the RANGE MARK GAIN control R1512
clockwise, the range marks _________________________
on the time base sweep.
j. Examine Figure 49.
Figure 49 shows a properly aligned PPI
display in 40-mile range.
(1) The start
of
the
time
base
sweep
is
positioned
in
the
center of the CRT.
(a) Adjusting the SEARCH VERTICAL CENTERING control R1504 will
cause the start of the time base sweep to move up or down.
(b) Adjusting the SEARCH HORIZONTAL CENTERING control R1505
will cause the start of the time base sweep to move left or right.
(c) Rotate R1504 and R1505, located on the synchronizer-
generator, electronic-marker SN-386/FPN-40, slightly clockwise and
then counterclockwise and observe the movement of the PPI display on
the CRT (Figure 50).
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