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Figure 3-2. Frequency counter assembly, exploded view
Up
TM-11-6625-601-34 Maintenance Kit Electronic Equipment MK-733/ARC-54 (NSN
Next
Figure 3-3. Rf power meter adjustment bench test setup
TM 11-6625-601-34
(Insure that the drive gear (48) and right idler
(j) Place the megahertz drive motor (35)
gear (54) are properly meshed.)
in its position on the left side of the frequency
c o u n t e r (28) and secure with two machine
(h) Replace the right gear cover (49) and
screws (36) and lockwashers (37). (Insure that
secure to the frequency counter (28) with the
the drive gear (39) and the left idler gear (60)
two machine screws (40, lockwashers (41 and 43),
are properly meshed.)
and hexagonal nuts (42).
(k) Replace the left gear cover (34) and
secure it to the frequency counter (28) with the
(i) Slide the drive gear (39) onto the drive
two machine screws (30), lockwashers (31 and
shaft of the megahertz drive motor (35) and sec-
33), and hexagonal nuts (32).
ure with the spiral pin (38).
ADJUSTMENT
Section IV.
3 - 1 3 . Test Equipment and Special Tools
(5) Set TEST FUNCTION SELECTOR
Required for Adjustment
switch S11 to TEST SET position.
(6) Set RCVR/XMTR FUNCTION switch S9
a. Table 3­3 lists test equipment required for
to PTT position.
a d j u s t i n g RF Power Meter M1 (located in
( 7 ) Set XMIT-RCVR-PTT switch S6 to
T S ­ 1 9 6 7 / A R C - 5 4 ) and also the associated
RCVR position.
technical manuals.
(8) Set POWER/VSWR switch S2 to FWD
position.
Table 3-3. Test Equipment Required for Adjustment
( 9 ) Set POWER circuit breaker to ON
Test Equipment
Technical
Manuals
position.
Wattmeter AN/URM-120
TM 11-6625-446-15
(10) Switches not listed may be set to any
b. To gain access to the interior of the test
position.
set, remove 10 screws from around the edge of
d. Connect the RT-348/ARC-54 and Wattme-
the front panel and slide the test set from the
ter AN/URM­120 to the test set as shown in
lower case; use the two handles.
3­14. Adjustment Procedure for Rf Power
e. Set XMIT-RCVR-PTT stitch S6 to XMIT.
Meter
M1 (located
in  TS-1967/
ARC-54)
f. Adjust potentiometer R1 (fig. 3-3) until the
reading on RF POWER meter M1 is equal to
a. Remove
the
the
cover
from
t h e reading on the AN/URM­120 (approx-
RT-348/ARC-54.
imately 10 watts).
b. Apply +27.5 volts dc to POWER jack J32.
c. Set the test set front panel controls as fol-
3-15. Testing
lows:
(1) Set
For final testing procedures at the general sup-
FREQUENCY
SELECTOR-MC
p o r t level to determine acceptability of a
switch S3 to 40 position.
(2) Set
FREQUENCY
SELECTOR-MC
repaired MK­733/ARC-54, refer to the self-
check tests that are part of the monthly preven-
switch S4 to 0 position.
tive maintenance checks in TM 11-6625-601-12.
FREQUENCY
(3) Set
SELECTOR-MC
switch S5 to .00 position.
If all the checks are satisfactory, the
(4) S e t T E S T F U N C T I O N S E L E C T O R
M K - 7 3 3 / A R C - 5 4 can be considered to meet
switch S10 to RADIO position.
acceptable final test standards.
3-8

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