TM 11-5826-225-3S
ac. Listen for a zero beat in the headset
trol unit to 1.5 kc on either side of 200 kc
while adjusting the TUNE control on the con-
(198.5 kc to 201.5 kc). If a zero beat is not
trol unit to 5.0 kc either side of 900 kc (895
heard, remove the cover of L3 (fig. 2-16 or
kc to 905 kc), If a zero beat is not heard,
216.1) and adjust L3 for a zero beat at 200 kc.
remove the cover of L5 (fig. 2-16 or 2-16.1)
n. Repeat g through m above until a zero
and adjust L5 for a zero beat at 900 kc.
beat is heard at both 390 kc and 200 kc.
ad. Repeat x through ac above until a zero
o. Temporarily replace the cover of L13 (do
beat is heard at both 1700 kc and 900 kc.
not solder) and repeat g through m above for
ae. Temporarily replace the cover of L5 (do
the zero beats.
not solder) and repeat x through ac above for
p. Set the range switch on the control unit
the zero beats.
to 400-850, and adjust the TUNE control on
af. Solder the covers in place on L3, L4, and
the control unit for 800 kc.
L5.
q. Set the signal generator to 800 kc, plus
or minus 0.1 kc.
3-14. RF Alignment
r. Adjust C40 (fig. 2-16 or 2-16.1) for a
a. Connect the equipment as shown in figure
zero beat in the headset.
2-2. -
s. Adjust the TUNE control on the control
b. Perform the procedures in paragraph 3-
unit for 420 kc.
13b, c, d, and e.
t. Set the signal generator to 420 kc, plus
c. Set the 150PF-270PF switch on the sense
or minus 0.1 kc.
antenna adapter to 150PF.
u. Listen for a zero beat in the headset while
d. Set the range switch on the control unit
adjusting the TUNE control on the control
to 190-400, and adjust the TUNE control on
unit to 2.5 kc on either side of 420 kc (417.5
the control unit for 390 kc on the FREQUEN-
kc to 422.5 kc). If a zero beat is not heard
CY indicator.
remove the cover of L4 (fig. 2-16 or 2-16.1)
e. Modulate the signal generator output 30
and adjust L4 for a zero beat at 420 kc.
percent with 400 cps. Maintain this modulation
v. Repeat p through u above until a zero beat
unless instructed otherwise.
is heard at both 800 kc and 420 kc,
f. Set the frequency of the signal generator
w. Temporarily replace the cover of L4 (do
to 390 kc (the same as the receiver setting)
not solder). and repeat p through u above for
as determined by a zero beat in the headset.
the zero beats.
g. Set the BFO-OFF switch on the control
x. Set the range switch on the control unit to
unit to OFF.
8501750, and adjust the TUNE control on the
h. Disconnect the headset from the test
control unit for 1700 kc.
set.
y. Set the signal generator to 1700 kc plus
i. Adjust the GAIN control on the control
or minus 0.1 kc.
unit to approximately three-fourths of the fully
clockwise position (maximum gain).
z. Adjust the TUNE control on the control
unit for 900 kc.
j. Adjust the output of the signal generator
for 20 milliwatts (row) on the audio output
aa. Adjust C44 (fig. 216 or 2-16.1) for
meter.
a zero beat in the headset.
NOTE
ab. Set the signal generator to 900 kc, plus
Maximum sharpness of tuning indi-
or minus 0.1 kc.
Change 1 3-23
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