Calibration of R-1467(P)/GRC-144(V) and R-1467(P)A/GRC-1440V) Local Oscillator Metering Circuits

TM 11-5820-695-35

(para 3-12b, item No. 81) for corrective action upon

Remove the protective plate over the

completion of this procedure.

potentiometer bracket, and adjust potentiometer

2A15A2R5 (fig. 3-18) for a 2A15A2M1 meter indication

Turn the TS-656/U off and remove the

of 30. If a meter indication cannot be obtained, refer to

connector adapter from connector 2A16WlXA12A.

the troubleshooting chart (para 6-12b, item No. 3) for

Reinstall alarm monitor 2A12 on plate

corrective action. Do not continue this procedure.

assembly 2A16 (TM 11-820-695-12).

Disconnect the test equipment from coaxial

Set POWER ON/OFF switch 2A15A2S1 on

cable 2W9.

meter panel assembly 2A15A2S1 to ON.

Connect coaxial cable

2W9

local

3-65. Calibration of R-1467(P)/GRC-144(V) and R-

oscillator bandpass filter 2FL6.

1467(P)A/GRC-1440V) Local Oscillator Metering

Turn the AN/URM-2B off.

Circuits

NOTE

Turn Test Set, Radio Frequency Power AN/

Do not calibrate any of the following

USM-161 and Signal Generator AN/URM-2B on and

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

allow a 30-minute warmup period.

metering circuits if the LOCAL OSC

After the warmup period, calibrate the

POWER metering circuit (step o

AN/USM-161 using the procedures given in TM 11-

above) could not be adjusted to

6625-498-12 and calibrate the AN/ URM-52B at 4700

obtain a 2A15A2M1 meter indication

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

of 30.

Connect the equipment as shown in figure

To calibrate any of the following R-1467(P)/

3-32.

GRC-144(V) local oscillator metering circuits, turn meter

On the AN/USM-161, set the BIAS-READ

selector switch 2A15A2S1 (fig. 3-18) to 'the circuit to be

switch to READ, turn the POWER RANGE switch to 3.0

calibrated and observe the indication on meter

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

2A15A2M1. If meter indication is not 100, remove the

and turn the POWER indicator dial for a dial scale

protective plate over the potentiometer bracket and

indication of 1.0 on the center scale.

adjust the associated potentiometer (listed below) for a

Adjust the OUTPUT ATTEN control on the

2A15A2M1 meter indication of 100.

If a meter

AN/URM-2B for a null indication on the AN/USM-161

indication of 100 cannot be obtained, refer to the

NULL INDICATOR meter.

troubleshooting chart (para 3-12b, item No. 33 through

36) for corrective action.

Adjust the POWER SET control on the

AN/URM-2B for an index indication of 0 dbm on the

Circuit to be calibrated

Potentiometer(fig. 3-4)

OUTPUT ATTEN dial.

FREQ MIXER CURRENT 1............................ 2A15A2R3

Turn the AN/;USM-161 off and disconnect

FREQ MIXER CURRENT 2............................ 2A15A2R4

RF Cable CG-92D/U from Adapter UG-29B/U (fig. 5-2).

MULT-OSC ................................ ....................2A15A2R6

Set the OUTPUT ATTEN control on AN/

On R-1467/GRC-144, reset the controls on

URM-52B for a dial scale indication of -6 dbm.

2FL6 and 2A14 to the operating frequency recorded in

step i.

Record

the

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

operating frequency.

3-66. R-1467(P)/GRC-144(V) and R-1467 (P)A/GRC-

144() Carrier Alarm Adjustment

On R-1467(P)/GRC-144(V), set local

oscillator bandpass filter 2FL6 and electrical frequency

NOTE

synthesizer 2A14 controls to 4700 MHz.

Performing this procedure will affect

Disconnect coaxial cable 2W9 (fig. 324)

the calibration of the T-1054(P)/GRC-

from local oscillator bandpass filter 2FL6, I. Connect

144(V) radio test set.

Therefore,

the equipment as shown in figure 3-27.

perform the radio test set calibration

procedure given in paragraph -61

Turn meter selector switch 2A15A2S1 on

meter panel assembly 2A15A2 to LOCAL OSC

upon completion of the following

POWER.

procedure.

Fine tune the SIGNAL FREQUENCY control

Turn Test Set, Radio Frequency Power

on AN/URM-2B for a peak indication on meter

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

2A165A2M1.

and allow a SO-minute warmup period.

Change 6

3-81