Calibration of T-1054(P)/GRC-144(V) and T-1054(P)A/GRC-144(V) Traffic Metering Circuit

TM 11-5820-695-35

bracket and adjust the associated potentiometer (listed

Set POWER ON/OFF switch 1A15A8S4 on

below) for a 1A15A8M1 meter indication of 100. If a

meter panel assembly 1A15A8 to ON.

meter indication of 100 cannot be obtained, refer to the

3-61. Calibration of T-1054(P)/GRC-144(V) and T-

troubleshooting chart (para 3-6b, items Nos. 41 through

1054(FP)A/GRC-144(V) Radio Test Set

43) for corrective action.

NOTE

Circuit to be calibrated

Potentiometer (fig. 3-4)

Before performing the calibration

APL-MULT ................................ .....................1A15A8R4

procedures below, perform the R-

2ND MULT ................................ .....................1A15A8R3

1467(P)/ GRC-144(V) if gain and

3RD MULT (LOCAL OSC).............................. 1A15A8R2

carrier alarm test (para 3-75).

3-60. Calibration of T-1054(P)/GRC-144(V) and T-

Turn Test Set, Radio Frequency Power AN/

1054(P)A/GRC-144(V) Traffic Metering Circuit

USM-161 and Signal Generator AN/URM-52B and allow

Set POWER ON/OFF switch 1A15A8S3 on

a 30-minute warmup period.

meter panel assembly 1A15A8 to OFF.

After the warmup period, calibrate the AN/

Remove alarm monitor 1A5 from plate

USM-161 using the procedures given in TM 116625-

assembly 1A16 (TM 11-5820-695-12).

498-12 and calibrate the AN/URM-52B at 4700 MHz

using the procedures given in TM 11-6625-214-10.

Turn Test Set, Radio Frequency Power AN/

USM-161 on and allow a 6-minute warmup period.

Connect the equipment as shown in figure

3-32.

On the TS-656/U, set the FUNCTION switch

to 'DIR CUR, turn the CURRENT switch to 100 MICRO-

On the AN/.USM-161, set the BIAS-REAR

AMP, and turn the DECREASE/ INCREASE control

switch to READ, turn the POWER RANGE switch to 3.0

counterclockwise until mechanical stop is reached.

MW +5 DBM, turn the COMP ATTENUATOR dial to 0,

and turn the POWER indicator dial for a dial scale

Install the connector adapter (part of MK-

indication of 1.0 on the center scale.

1207/GRC) on connector 1A16W25XA5B (fig. 3-2).

Adjust the OUTPUT ATTEN control on the

Connect red test lead supplied with

AN/URM-52B for a null on the AN/ USM-161 NULL

TS656/U between the DIR OUR terminal on TS656/U

INDICATOR meter.

and red test jack on the connector adapter.

Adjust the POWER SET control on the

Connect the black test lead supplied with

AN/URM-52B for an index indication of 0 dbm on the

TS-656/U between the COMMON terminal on TS-656/U

OUTPUT ATTEN dial.

and black test jack on the connector adapter.

Turn off the AN/USM-161 and disconnect

Turn the meter selector switch 1A15A8S4

RF cable CG-92D/U from Adapter, UG-29B/U (fig.

on meter panel assembly 1A15A8 to TRAFFIC and

332).

remove the protective plate over potentiometer bracket

(fig. 3-4).

Set the OUTPUT ATTEN control on AN/

URM-52B for a dial scale indication of -71 dbm.

On TS-656/U, hold the TEST switch in

TEST (up) position and 'turn the DECREASE/

Set Switch, Waveguide SA-1679/GRC to

INCREASE control in INCREASE direction (clockwise)

the TO) LOAD (TEST) position.

until a reading of 50 microamperes is observed on TS-

Disconnect the antenna waveguide from the

656/U meter.

rf entry panel on the external shelter wall.

Adjust potentiometer 1A15A8R7 (fig. 3-4)

Disconnect the coaxial cable connected to

for a 1A15A8M1 meter indication of 90. If a meter

Coupler, Directional CU-1890/GRC.

indication of 90 cannot be obtained, refer to the

Connect the equipment as shown in figure

troubleshooting chart (para 3-6b, item No. 38) for

3-33.

corrective action upon completion of this procedure.

Record

the

R-1467(P)/GRC-144(V)

Release the TEST switch on TS-656/U.

operating frequency.

Turn the TS-656/U off and remove the

R-1467(P)/GRC-144()

set

the

connector adapter from connector 1A16W25XA5B.

preselector bandpass filter 2FL4, post selector bandpass

Reinstall alarm monitor 1A5 on plate as

filter 2FL5, local oscillator bandpass filter 2FL6, and

sembly 1A16 (TM 11-5820-695-12).

electrical frequency synthesizer 2A14 controls to 4700

MHz.

Change 6

3-78