TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
5
If freq not brought into agree-
(cont'd)
ment by this adjustment within
+/- 2-1/2 MHz, adjust tab 6 and
lock when accomplished. Leave
tab 7 loose.
Increase sig gen freq to 2400 MHz and POWER SET instrument.
Modes should be centered on scope, per figure 6-10C, and frequency of
signal generator should agree with freq counter within +/- 2-1/2 MHz.
If modes not centered, note
position of R4 HIGH shaft.
Further adjust HIGH pot R4 on
tracking board. If adjusting R4
ineffective, return it to previous
adjustment position.
If freq not brought into agree-ment
by this adjustment within +/- 2-1/2
MHz, adjust tab 7 and lock when
accomplished.
Once cam tabs have been frequency alined, tune through the freq range of the sig gen from low to
high observing frequencies displayed on sig gen and frequency counter. Observe mode displays on
the scope.
At all points across the frequency range, the sig gen frequency agrees
with the frequency counter within +/- 5 MHz.
The mode patterns should be continuous. When starting at 800 MHz,
the mode pattern is centered. As frequency is increased, the pattern
shifts to the right of the scope screen until the mode switching point
(1700 MHz) when the pattern recenters itself until 2400 MHz is reached.
The pattern should exhibit no loss of power except at the mode switching
point (about 1700 MHz) where an abrupt change in power level is
observed.
Touch up adjustments of the
tracking pots in the areas of their
influence on frequency until
frequencies agree within +/-5%
across band. Mode patterns will
improve upon touch up of pot
adjustments. After final
adjustment, tighten all tracking
board pots and place a glyptol dot
on each adjusted pot between pot
shaft and locking mechanism to
pre-vent movement.
6-39