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Alignment of 3.0- to 3.9-Mc If. Subunit
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TM-11-5820-222-35 Radio Sets AN/VRC-24 and AN/TRC-68 Manual
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Alignment of First Oscillator


(11) If procedure (10) above indicates
(3) Connect the output of AN/URM-
the necessity, tune C317, C312,
25D to test point J301 (fig. 62).
C309, and C306 for maximum volt-
c. Procedure.
age on the ME-26/U (fig. 62).
Warning: Avoid direct contact with the
(12) Repeat procedure (6) through (11)
trimmer shafts of capacitors C306 and
above until no further increase in
C312. The shafts are at B+ potential; do
voltage can be obtained on the ME-
not short them to ground.
26/U.
(13) O p e r a t e t h e M A N U A L F R E -
(1) Set the MANUAL FREQUENCY
QUENCY UNITS control from 9
UNITS control to 9. Set the MAN-
to 0 and tune the AN/URM-25D
UAL FREQUENCY TENTHS con-
f r o m 29.9 to 20.9 mc in cor-
trol to .9.
responding 1.0-mc decrements. At
each control position, check the
Note. In the following procedure, adjust
the AN/URM-25D output level as neces-
tuning of L303, L304, L305, and
sary to maintain the ME-26/U indication
L306 with the tuning wand. Only
between -1 and -2 volts dc.
slight detuning (if any) should be
(2) Turn trimmer capacitors C302,
noted in the middle of the 9 to 0
C304, C306, C309, C312, and C317
range. If considerable detuning is
noted, check the tuning slugs for
(fig. 62) to the right, to their stops.
(3) Adjust slugs of L301 through L306
p r o p e r travel. The slugs should
(fig. 113) so that the tops of the
move linearly for given increments
slugs are 1 inch from the top of the
of rotation, Replace any worn or
cover.
b r o k e n parts or replace L303,
(4) Set the AN/URM-25D frequency
L304, L305, or L306.
to 29.9 mc unmodulated and adjust
(14) Remove the AN/URM-25D and con-
the output level to obtain a read-
nect the TS-497/URR to the ANT.
able indication on the ME-26/U.
jack through the 6-db attenuator
(supplied with the TS-497/URR).
Note. Perform (2) and (3) below only
(15) Set the MANUAL FREQUENCY
when this subunit has been severely mis-
UNITS and the TENTHS controls
aligned.
to 9 and .9, respectively. Set the
(5) I f necessary, check L306, L305,
MANUAL FREQUENCY TENS con-
L304, and L303 with the tuning
trol to 29 or 39. Set the TS-497/
wand (para 132c(7)) for maximum
URR to the same frequency indi-
voltage on ME-26/U.
c a t e d b y t h e  MANUAL FRE-
(6) Set the MANUAL FREQUENCY
QUENCY controls (299.9 or 399.9
UNITS control to 0. Set the MAN-
mc).
UAL FREQUENCY TENTHS con-
Note. In the procedures outlined in
(16)
trol of .0. Set the AN/URM-25D
through (22) below, slightly readjust
the
frequency to 20.0 mc unmodulated.
TS-497/URR for a maximum ME-26/U
in-
(7) Check L306, L305, L304, and L303
dication each time the frequency of
the
TS-497/URR is changed.
with the tuning wand (para 132c(7)).
(8) I f necessary, tune L306, L305,
(16) Adjust the output level of the TS-
497/URR to obtain a readable indi-
L304, and L303 for maximum volt-
cation on the ME-26/U (between -1
age on ME-26/U.
(9) Set the MANUAL FREQUENCY
and -2 volts dc).
(17) Check L302 and L301 (fig. 113) with
UNITS control to 9. Set the MAN-
UAL FREQUENCY TENTHS con-
the tuning wand and adjust, if nec-
trol to .9. Set the AN/URM-25D
essary.
(18) Adjust C302 and C304 (fig. 62) for
frequency to 29.9 mc unmodulated.
(10) Check L306, L305, L304, and L303
maximum indication on the ME-26/
U.
(fig. 113) with the tuning wand.
174


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