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Page Title:
Replacement of Bandpass filters 3A3 and 3A4 |
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|  TM 11-5820-695-35
from the R-1467(P)A/GRC-144(V) cabinet.
(6) Remove eight hex socket head
screws, flat washers and lockwashers that secure
NOTE
directional coupler 3A7DC1 to waveguide assembly W3
If BP filter 3A3 requires replacement
and W4. Remove directional coupler 3A7DC1, and two
remove
converter
gasket "O" rings.
electronics 3A2 and alarm monitor
b.
Replacement.
3A1.
If BP filter 3A4 requires
replacement
remove
amplifier-
(1) Replace directional coupler 3A7DC1,
multiplier 3A5 and power supply 3A6.
two gasket "0" rings, and secure with eight hex socket
head screws, flat washers, and lockwashers.
(4) Remove screws that secure top
corner of electrical equipment chassis 3A7 (fig. 5-108,
(2) Carefully connect SMA connector to
top view with cover removed).
directional coupler 3A7DC1, and tighten left end.
Tighten SMA connector at right end of detector.
(5) Use the fabricated Allen wrench and
loosen two screws that secure BP filter 3A3 input
(3) Secure
top
cover
to
electrical
waveguide flange to waveguide twist W2.
equipment chassis 3A7.
(6) To remove BP filter 3A4, use
(4) Replace the CV-3633/GRC-144(V) on
fabricated Allen wrench and loosen two screws that
the R-1467(P)A/GRC-144(V) cabinet.
secure BP filter 3A4 output waveguide flange to
(5) Set the T-1054(P)A/GRC-144(V) and
waveguide twist W6.
R-1467(P)A/GRC-144(V) POWER ON/OFF switches to
(7) Remove screws lockwashers and fat
l
ON.
washers from rear of BP filter 3A3 or 3A4.
(6) Set the POWER ON/OFF switch on
(8) Loosen front mounting screws of BP
the status panel 3A8 to ON.
filter 3A3 or 3A4 and remove filter, and gasket "0" ring.
(7) Perform the AN/GRC-144(V)4 output
b.
Replacement.
power test (para 3-76) and reflected power alarm
threshold test and calibration procedure (para 3-79).
NOTE
3-53.5.
Replacement of Bandpass filters 3A3 and
Check that BP filter guide pins mate
3A4 (fig. 5-108)
with respective holes in waveguide
a.
Removal.
twist. If guide pins do not mate
properly, remove guide pins from BP
(1) Set the T-1054(P)A/GRC-144(V) and
filter and replace them in their proper
R-1467(P)A/GRC-144(V) POWER ON/OFF switches to
mating hole.
OFF.
(1) Replace BP filter 3A3 or 3A4 into their
(2) Set the POWER ON/OFF switch on
respective slots and align rear waveguide flanges with
the status panel 3A8 to OFF.
waveguide twists W2 or W6 respectively.
(3)
Remove
the
CV-3633/GRC-144(V)
Change 6
3-74.3
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