Figure 4-5. AN/PRR-9(XE-9) audio distortion test.

TM 11-5820-549-50-1

Figure 4-5. AN/PRR-9(XE-9) audio distortion test.

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

receiver.

c. Set the AN/URM-103 for receiver channel

frequency. Read frequency on AN/USM-207.

d. Adjust receiver volume control for squelch "off"

operation.

e. Adjust output of AN/URM-103 for an indication

on the ME-30A/U of 4.8 millivolts at TP2 (fig. 2-2).

f. increase the output signal level of the AN/ URM-

103 by 6 db.

g. Tune the AN/URM-103 on each side of the

channel frequency until the ME-30A/U again reads 4.8

mv. Note and record the frequencies, as indicated on

the AN/USM-207, at which the ME-30A/U reads 4.8 mv.

h. The spread between the two frequencies

recorded in step g shall be 40 kHz + 10 kHz.

Figure 4-6. AN/PRR-9(XE-9) dc power consumption

test.

i. Increase the output signal level of the AN/ URM-

103 by an additional 54 db.

j. Repeat step g.

k. The spread between the two frequencies

recorded in step j shall be no more than 72.0 kHz.

4-14. AN/PRR-9(XE-9) Discriminator Characteristics

Test

For this test the receiver electronic unit assembly must

be removed from the receiver case.

a. Connect the test equipment as shown in figure

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

receiver.

Figure 4-7. AN/PRR-9(XE-P) oscillator tests.

c. Set the AN/GRM-50 for 455 kHz as indicated on

the AN/USM-207.

4-5