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|  (15) Adjust L111 (fig. 72) for a maxi-
sides should be lined up with the
mum power output indication on
stator. Refer to paragraph 125 for
AN/URM-43A. To adjust coupling
mechanical synchronization.
loop L111, loosen the two holding
(3) Set the R108 (fig. 72) fully clock-
screws and rotate the rf connector.
wise (maximum resistance) and
(16) Readjust C132 as described in (13)
rotate trimmer capacitors C107,
above.
C115, C122, C127, C141, and C132
(17) Rotate the front panel METER
counterclockwise to their stops
switch to PA Ib and adjust R108
(4) Key the transmitter by connecting
on the front-panel meter. Recheck
a lead between the RADIO CONT
C132 and C141 as described in (13)
LINE and the CONT LINE RETURN
terminals on the audio test box.
and (12) above.
(18) Track Z108 (fig. 68) by bending the
Note. The following procedures are per-
tabs on the rotors of the main tun-
formed with the radio set keyed to trans-
ing capacitor part (part of Z108).
mit. If the tuning indications at test
Start at 399.9 mc and decrease the
points J105 and J106 are masked by satur-
setting of the MANUAL FRE-
ation (tuning a capacitor over a wide range
QUENCY TENS control in 10-mc
produces only a slight change in the volt-
steps to 229.9, then decrease the
age reading at a test point), decrease the
frequency to 225.0 mc. At each
if. voltage to V101 by inserting a tuning
wand into one of the if. tuning coils L303,
frequency, bend the tab that is half-
L303, L304, L305, or L306 (fig. 113).
meshed with the stator for maxi-
mum power output on the AN/URM-
(5) Set the ME-26/U to the -1-volt dc
43A. The chart in paragraph 136b
range and connect the dc probe to
shows the tab frequencies and the
test point J105 (fig. 68).
color code of the tabs.
(6) Adjust C107 and C115 (fig. 68) for
Note. At 229.9 mc, the yellow tab should
maximum voltage indication on the
be fully meshed with the stator.
ME-26/U.
(7) Set the ME-26/U to the -3-volt dc
(19) Track Z107 (fig. 68) by bending the
range and connect the dc probe to
tabs on the rotors of the main tun-
test point J106 (fig. 68).
ing capacitor (part of Z107). Start
(8) Adjust C122 (fig. 68) for maximum
at 375.0 mc and decrease the set-
voltage indication on the ME-26/U.
ing of the MANUAL FREQUENCY
(9) Set the ME-26/U to -10-volt dc
controls in 20-mc steps to 235.0;
range and connect the dc probe to
then decrease the frequency to
test point J114 (fig. 68).
225.0 mc. At each frequency, bend
(10) Adjust C127 (fig. 68) for a maxi-
the tabs on each side for a maxi-
mum voltage indication on the ME -
mum voltage indication on ME -26/
26/U.
U.
(11) Set the ME-26/U to the -100-volt
(20) Set the ME-26/U to the -10 volts
dc range and connect the dc probe
dc range and connect the dc probe
to test point J111 (fig. 72).
to test point J114 (fig. 68).
(12) Adjust C141 (fig. 72) for a maxi-
(21) Track Z106 by bending the tabs on
mum voltage indication on the ME -
the rotors of the main tuning ca-
26/U. The meter should read -25
pacitor (part of Z106) (fig. 68) for
to -30 volts dc.
a maximum voltage indication on
(13) Adjust C132 (fig. 68) for a maxi-
the ME-26/U. Start at 399.9 mc
mum output reading on the AN/
and decrease the frequency in 10-
URM-43A.
mc steps to 229.9 mc; then de-
(14) Perform procedures (5) through
crease the frequency to 225.0 mc.
(13) above in reverse order.
At each frequency setting, bend the
178
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