TM 11-5840-281-35/1
Tighten extension shaft setscrew.
(e) Note marking labels on coaxial cables
(c) While supporting ferrite switch S102,
and connect to proper connectors (J115, J116, J117,
remove two screws, flat washers, lockwashers, and nuts
and J118) on mixer assembly.
attaching ferrite switch to receiver-transmitter cabinet
(2) Replace attenuator AT102 as follows:
and remove ferrite switch.
(a) Install attenuator AT102 in receiver-
(d) Remove four gaskets MP153B from
transmitter cabinet cutout from the inside with the
ferrite switch waveguide flanges.
terminal strip side down. Attach attenuator with six
(5) Remove attenuator AT101 as follows; (a)
screws, flat washers, lockwashers, two nut plates MP163
Tag and disconnect wires connected to terminal board
and gaskets MP138.
AT101-1.
(b) Connect wires disconnected in step a
(b) Remove six screws, flat washers,
(6) (a) above to terminal board AT102-1.
lockwashers, nuts and packing washers MP156 and
(3) Replace attenuator AT101 as follows:
remove attenuator AT101 and gasket MP133.
(a) Install attenuator AT101 in top cutout of
(6) Remove attenuator AT102 as follows: (a)
receiver-transmitter cabinet from outside with gasket
Tag and disconnect wires connected to terminal board
MP133 between attenuator flange and receiver-
AT102-1.
transmitter cabinet. Attach attenuator with six screws,
(b) While supporting attenuator AT102,
flat washers, lockwashers, nuts, and packing washers
remove six screws, fiat washers and lockwashers and
MP156.
two nut plates MP163 attaching attenuator AT102 to
(b) Connect wires disconnected in step a
receiver-transmitter cabinet and remove attenuator
(5) (a) above.
AT102 and two gaskets MP138.
(4) Replace ferrite switch S102 as follows: (a)
(7) Remove mixer assembly MP1SO0 as
Place waveguide gasket MP153B in each of four ferrite
follows: (a) Disconnect coaxial cables connected to
switch waveguide flange recesses.
connectors J115, J116, J117, and J118 on mixer
(b) Locate ferrite switch against receiver-
assembly MP150.
(b) Loosen the set screw on extension shaft
transmitter cabinet ferrite switch mounting bracket and
attach with two screws, flat washers, lockwashers, and
MP128 and disengage extension shaft from mixer
nuts.
assembly oscillator cavity tuning shaft.
(c) Attach ferrite switch waveguide flanges
(c) Remove four screws and flat washers
to attenuators AT101 and AT102 with eight screws, flat
attaching mixer assembly oscillator cavity to mixer
washers, and lockwashers.
assembly circulator and remove oscillator cavity.
(d) Attach ferrite switch to rigid waveguide
(d) Remove six screws, flat washers,
MP178 with four screws MS16995-25, flat washers, and
lockwashers and nuts attaching mixer assembly
lockwashers.
circulator to receiver-transmitter cabinet and remove
(e) Place waveguide gasket MP152D in
mixer assembly circulator.
recess of waveguide flange MP130 and install
(e) Assemble mixer assembly oscillator
waveguide flange on ferrite switch.
Join flexible
cavity and circulator. Attach parts with four screws and
waveguide MP176 to waveguide flange and ferrite switch
flat washers removed in step (c) above.
and secure with four screws, flat washers MS16995-27,
(f) Remove semiconductor device diodes
and lockwashers.
CR121, CR122, CR123, and CR124 from mixer
(f) Connect wires removed in step a (4) (b)
assembly and install in replacement mixer assembly.
above to terminal board S102-1.
b. Replacement. To replace rf components, proceed
as follows:
(1) Replace mixer assembly as follows: (a)
Remove four screws and flat washers attaching mixer
assembly MP150 oscillator cavity to circulator and
separate parts. Retain screws and flat washers. (b)
Install mixer assembly circulator on receiver side of
receiver-transmitter cabinet and attach with six screws,
flat washers, lockwashers, and nuts.
(c) Assemble mixer assembly oscillator
cavity to circulator and attach with four screws and flat
washers removed in step (a) above.
(d) Install extension shaft MP128 on mixer
assembly oscillator cavity tuning shaft.
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