Section II. TESTS

TM 11-5820-549-50-1

Figure 4-1. Rf pad, construction details.

Section II. TESTS

4-6. AN/PRR-9(XE-9) Sensitivity Test

i. Value obtained in step g shall be at least 10 db

higher than the value obtained in step h.

Remove the antenna from the receiver. Make overall

j. Change the receiver channel frequency to 47

sensitivity test as follows:

MHz (crystal frequency 36.3 MHz) and aline on ID-

a. Place a 51 MHz channel frequency crystal

1189(XE-2)/PR. Repeat steps b. through i.

(crystal frequency 40.3 MHz) in the receiver and aline

k. Change the receiver channel frequency to 57

with ID-1189(XE-2)/PR.

MHz (crystal frequency 46.3 MHz) and aline on ID-

b. Connect the, test equipment as shown in figure

1189(XE-2)/PR. Repeat steps b. through i.

c. Set the PP-3514/U for 3.2 0.1 volts input to the

4-7. AN/PRR-9(XE-9) Squelch Sensitivity Test

receiver.

This test should be run after the sensitivity test in

d. Set the TS-585A/U for 150 ohms.

paragraph 4-6. The receiver may be operated on any

e. Set the AN/URM-103 for 0.8 microvolts at

normal channel frequency.

channel frequency, and 8 kHz deviation at 1 kHz.

a. Connect the test equipment as shown in figure

Leave the TS-421A/U off for this test.

f. Adjust the receiver volume control, squelch off,

b. Set the PP-3514/U for 32 0.1 volts input to the

for an audio output power reading of 2.4 milliwatts on

receiver.

the TS-585A/U.

c. Set the TS-585A/U for 150 ohms.

g. Note and record the db indication on the TS-

d. Set the AN/URM-48 for the receiver channel

723A/U in the SET LEVEL position.

frequency and 3.0 kc deviation using 150

h. Change the TS-723A/U from the SET LEVEL

position to the DISTORTION position and note and

record the db indication.

Figure 4-2. AN/PRR-9(XE-9) sensitivity test.

4-2