TM 11-5840-281-35/1
3-62. Removal and Replacement of Radar Receiver-
b.
Replacement.
To replace transmitter
Transmitter RT-81 8/TPN-18 Rf Components
subassembly no. 1, proceed as follows:
(1) Remove modulator tube V202 from
transmitter subassembly no. 1 MP258.
These procedures provide removal and replacement
(2) Locate transmitter subassembly no. 1
procedures for tr tubes V101 and V102, oscillator tube
outside of radar transmitter chassis next to chassis front
V103, ferrite switch S102, attenuators AT101 and
mounting access.
AT102, and mixer assembly MP150.
Do not
(3) Connect radar transmitter wires to
disassemble or remove rf components beyond those
terminal board TP202 on transmitter subassembly no. 1.
necessary to effect repairs.
(4) Install transmitter subassembly no. 1 in
a.
Removal.
To remove rf components,
radar transmitter and retain with four screws.
proceed as follows: NOTE Retain all hardware for
(5) Attach ground strap MP230 to
reinstallation of parts.
transmitter subassembly no. 1 with screw.
(1) Remove tr tube V101 as follows:
(6) Install modulator tube V202 on
(a) Disconnect electrical lead MP147
transmitter subassembly no. 1 and secure with tube
from tr tube V101.
clamp MP262.
(b) Remove eight screws and
(7) Connect plate cap connector MP218 to
lockwashers attaching tr tube V101 to mixer assembly
modulator tube plate cap.
MP150 and flexible waveguide MP176 and remove tr
(8) Install perforated cover MP214 on radar
tube V101.
transmitter chassis and retain with 15 screws.
(2) Remove tr tube V102 as follows:
(9) Install radar transmitter in receiver-
(a) Disconnect electrical lead MP148
transmitter cabinet as outlined in paragraph 3-58b
from tr tube V102.
above.
(b) Remove eight screws and
lockwashers attaching tr tube V102 to mixer assembly
3-61. Removal and Replacement of Transmitter
MP150 and flexible waveguide MP175 and remove tr
Subassembly No. 4
tube V102.
(3) Remove oscillator tube V103 as follows:
(a) Disconnect plate and filament
a.
Removal.
To remove transmitter
caps from oscillator tube V103.
(b) Remove four screws attaching
subassembly NO. 4, proceed as follows:
oscillator tube V103 to mixer assembly MP150 and
(1) Remove radar transmitter as outlined in
remove oscillator tube V103 and gaskets MP144 and
paragraph 3-58a above.
MP152B. Retain screws and gaskets for reinstallation.
(2) Disconnect connector P201 from
(c) If oscillator tube is to be replaced,
connector J201.
re- move tuner fitting MP130 from oscillator tube and
(3) Remove screw MS51957-45 and two
install on replacement oscillator tube.
screws MS51959-28 and remove transmitter sub-
(4) Remove ferrite switch S102 as follows:
assembly NO. 4 MP270 from radar transmitter chassis.
(a) Remove 16 screws, fiat washers
b.
Replacement.
To replace transmitter
and lockwashers attaching ferrite switch waveguide
subassembly no. 4, proceed as follows:
flanges to attenuators AT101 and AT102 and to flexible
(1) Install transmitter subassembly no. 4
waveguide MP176 and rigid waveguide MP178. Remove
MP270 in radar transmitter chassis and retain with
waveguide flange MP130 and gaskets MP152D and
screws removed in a, (3) above.
MP153B.
(2) Connect connector P202 to connector
(b) Tag and disconnect wires
J202.
connected to terminal board S102-1.
(3) Install radar transmitter in receiver-
transmitter cabinet as outlined in paragraph 3-58b
above.
3-62
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