Replacement of Post Selector Bandpass Filter 2FL5

TM 11-5820-695-35

oscillator metering circuits calibration procedure (para 3-

(2) Secure preselector bandpass filter

65)

2FL4 upper flange to top of electrical equipment cabinet

2A15 using the six screws removed in step (7).

3-46. Replacement of Local Oscillator Bandpass

Filter 2FL6 (fig. 3-17)

(3) Secure external input waveguide se

tion to preselector bandpass filter 2FL4 using the eight

Removal.

screws removed-in step a(6).

(1) Set the POWER ON/OFF switch on

(4) Connect and hand tighten the knurled

meter panel assembly 2A15A2 to OFF.

connector INPUT J1 on tunnel diode amplifier 2A2 to its

(2) Disconnect coaxial cable 2W9 (fig.

mating connector on preselector bandpass filter 2FL4 by

824) from connector 2FL6J1.

rotating the knurled connector in a counterclockwise

(3) Disconnect coaxial cable 2W8 from

direction (as viewed from front of 2A2).

connector 2FL6J2.

(5) Tighten the four captive screws on

(4) Remove the three screws (fig. 8-18)

tunnel diode amplifier mounting bracket.

and flat washers that secure local oscillator bandpass

(6) Release the meter panel assembly

filter 2FL6 to plate assembly 2A16. Care fully withdraw

2A15A2 and position it downward against electrical

2FL6 from the cabinet.

equipment cabinet 2A16.

Replacement.

(7) Secure

meter

panel

assembly

(1) Install replacement local oscillator

2A15A2 with the two meter panel captive screws.

bandpass filter 2FL6 in electrical equipment cabinet

(8)

Restore power to R-1467/GRC-144

2A15, aligning the three filter mounting holes with the

(para 88b).

mounting holes on plate assembly 2A16. Secure 2FL6

(9) Perform the R-1467/GRC-144 local

to the plate assembly using the three screws and

oscillator metering circuits calibration procedure (para -

washers removed in step a(4) above.

65).

(2) Connect

coaxial

cable

2W9

3-45. Replacement of Post Selector Bandpass Filter

connector 2FL6J1.

2FL5 (fig. 8-17)

(3) Connect

coaxial

cable

2W8

Removal

connector 2FL6J2.

(1) Set the POWER ON/OFF switch on

(4) Set the POWER ON/OFF switch on

meter panel assembly 2A15A2 to OFF.

meter panel assembly 2A15A2 to ON.

(2) Disconnect coaxial cable 2W2 (fig.

(5) Perform the R-1467/GRC-144 local

S24) from connector 2FL6J1.

oscillator metering circuits calibration -procedure (para

8-65).

(3) Disconnect coaxial cable 2A15W1

from connector 2FL6J2.

3-47. Replacement of Low Pass Filter 2A15A6FL1

(fig. 8-19)

(4) Remove the three screws (fig. 8-18)

and flat washers that secure post selector bandpass

Removal.

filter 2FL5 to plate assembly 2A16. Carefully withdraw

(1) Remove power from R-1467/GRC-

2FL5 from the Cabinet.

144 (para 888a).

Replacement.

(2) Perform steps (2) through (8) of

(1) Install replacement post selector

paragraph 8-44a.

bandpass filter 2FL6 in electrical equipment cabinet

(3) Tag, unsolder, and remove the wires

2A165, aligning the three filter mounting holes with the

connected to the bottom terminals of low pass filter

mounting holes on plate assembly 2A16. Secure 2FL5

2A15A6FL1 (fig. 8-19).

to the plate assembly using the three screws and flat

(4) Remove the six screws and washers

washers removed in a(4) above.

se curing the filter to low pass filter assembly 2A15A6.

(2) Connect coaxial cable 2A15W1 to

Then lower the filter from the filer assembly exposing

connector 2FL5J2.

the filter upper terminals.

(3) Connect

coaxial

cable

2W2

(6) Tag, unsolder, and remove the wires

connector 2FL6J1.

connected to the upper terminals of the filter and

(4) Set the POWER ON/OFF switch on

remove the filter from the cabinet.

meter panel assembly 2A15A2 to ON.

(5)

Perform the R-1467/GRC-144 local

3-70