R-1467(P)/GRC-144(V) and R-1467(P)/GRC-144(V) IF Gain and Carrier Alarm Test

TM 11-5820-695-35

3-75.

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

c. Initial Teat Equipment Calibration..

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

(1) Turn on the AN/USM-161 and AN/URM-

and Carrier Alarm Test

52B and allow a 30-minute warmup period.

(2) Calibrate the AN/USM-161 using the

a. Test Equipment ad Materials.

procedures given in TM 11-6625-498-12.

(1) Signal Generator AN/URM-52B.

(3) Calibrate the AN/URM-52B at 4700 MIz

(2) Test Set, Radio Frequency Power AN/ USM-

using the procedures given in TM 11-6625-498-12.

161.

(4) Connect the test equipment as shown in

(3) Adapter UG-29B/U (part of Meter Calibration

figure 3-32.

Facilities Kit, MK-1207/GRC).

(5) On the AN/UM-I61, set the BIAS READ

b. Test Connections and Conditions. Performing

switch to READ, turn the POWER RANGE switch to 3.0

MW +5 DMB, and turn the POWER indicator dial for a

this test will affect the calibration of the T)54(P)/GRC-

dial scale indication of 1.0 on the center scale.

144(V) radio test set. Therefore, perform the radio test

set calibration procedure given in paragraph 3-61 upon

(6) Adjust the OUTPUT ATTEN control on the

completion of the test procedure given in d below.

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

NULL INDICATOR meter.

(1) Set Switch, Waveguide SA-1679/GRC to

the TO LOAD (TEST) position.

(7) Adjust the POWER SET control on the

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

(2) Disconnect the antenna waveguide from

OUTPUT ATTEN dial.

the rf entry panel on the external shelter wall.

(8) Turn off the AN/USM-161 and disconnect

(3) Disconnect the coaxial cable connected to

RF Cable CG-92D/U from Adapter UG-29B/U (fig. 3-32).

Coupler, Directional CU-1890/GRC.

(9) Set the OUTPUT ATTEN control on

(4) Record

the

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

AN/URM-2B for a dial scale indication of -71 dbm.

operating frequency.

(5) The R-1467(P)/GRC-144(V)' must have a

minimum of two hours warmup period before performing

test procedure (d below).

Figure 3-32. Calibration of Signal Generator AN/URM-52B equipment connections.

Change 6

3-96