TM 11-6625-586-45
o. Select output frequency of 80 MHz with RF
3-4. Power Supply Voltage Adjustment
TUNING control. Check electronic counter indi-
a. Connect multimeter to TP2.
cation.
p. If electronic counter does not indicate 80
tions listed below. Allow equipment warm up for
MHz, adjust capacitor A1A1C21 for desired in-
15 minutes before making any adjustments.
dication.
q. Check tracking over entire band. If off, re-
Switch
Position
adjust capacitor A 1 A 1 C 2 1 and band D coil
OPERATE-OFF-STAND- OPERATE
BY
A1A2L6.
M O D OFF
FUNCTION
r. Select band C with BAND SWITCH.
RF OUTPUT
0-10 KUV
s. Adjust potentiometer R27 for a 10.0-volt dc
c. Adjust 25 VOLTS ADJ R55 for 25-volt
indication on multimeter.
indication on multimeter.
t. With RF TUNING control, select an output
frequency of 54 MHz.
3-5. RF Frequency Range and Dial Accuracy
u. If electronic counter does not indicate 54
Adjustment
MHz, adjust band C coil A1A2L5 for desired in-
dication.
a. Connect HI-RF terminal of unit under test
v. Check tracking over entire band. If off, re-
FREQ A terminal of electronic counter.
adjust band C coil A1A2L5.
b. Turn OPERATE-OFF-STANDBY switch
w. Select band B with BAND SWITCH.
to OPERATE and FUNCTION switch to MOD
x. Adjust potentiometer R28 for a 10.7-volt dc
OFF.
i n d i c a t i o n on multimeter.
y. With RF TUNING control, select an output
the cursor to the center of the band select mask.
frequency of 38 MHz.
NOTE
z. If electronic counter does not indicate 38
MHz, adjust band B coil A1A2L4 for desired in-
Make certain the DIAL INDICATOR SET con-
dication.
trol is not moved during this procedure.
aa. Check tracking over entire band. If off, re-
d. Turn RF OUTPUT switch to 250 KUV.
adjust band B coil A1A2L4.
e. Set the unit to produce the frequencies listed
ab. Select band A with BAND SWITCH.
in table 3-1. At each frequency, the electronic
ac. Adjust potentiometer R29 for a 8.3-volt in-
counter should indicate within the specification
limits given in table 31. If unit is not within
dication on multimeter.
prescribed tolerances, adjust in accordance with
ad. With RF TUNING control, select an out-
steps f through af.
put frequency of 26.5 MHz.
f. On board A1A1 adjust capacitor A1A1C10
ae. If electronic counter does not indicate 26.5
until its plates are fully meshed.
MHz, adjust band A coil A1A2L3 for desired in-
g. With BAND SWITCH, select band D.
dication.
af. Check tracking over entire band. If off, re-
point A1A1TP1.
adjust band A coil A1A2L3.
i. Adjust potentiometer R26 for a 10.0-volt dc
indication on multimeter.
Table 3-1. RF Frequency Range and Dial Accuracy
j. With RF TUNING control, select an output
Specification limits, MHz
under test
Unit
frequency of 80 MHz.
frequency dial
Maximum
Minimum
setting, MHz
Band
k. Adjust capacitor A1A1C21 until the elec-
18.5925
18.4075
18.5
tronic counter indicates 80 MHz.
A
20.1000
19.9000
20.0
l. If an 80 MHz electronic counter indication
24.5220
24.2780
24.4
cannot be obtained in step k above, adjust band
26.1300
25.8700
26.0
D coil A1A2L6 for an 80 MHz indication.
26.7330
26.4670
26.6
B
30.5520
m. With RF TUNING control, select an output
30.2480
30.4
34.1700
33.8300
34.0
frequency of 53.5 MHz. Check electronic counter
37.7880
37.4120
37.6
indication.
37.7880
37.4120
37.6
C
n. If electronic counter does not indicate 53.5
43.2150
42.7850
43.0
MHz, adjust band D coil A1A2L6 for desired in-
47.2350
46.7650
47.0
53.8680
53.3320
dication.
53.6
3-2
