Alignment of Receiving Set, Radio AN/PRR(XE-9)

RECEIVER ALIGNMENT adapter, according to approximate settings for 47 megahertz (MHz), 47 megacycles, 51

MHz, or 57 MHz shown in figure 3-18. For channel frequencies not shown, approximate the settings proportionately

between those shown.

d. Turn the AN/PRR-9(XE-9) receiver control about one-half turn clockwise from the OFF position (TM 11-5820-549-

12-1).

e. Place the ID-1189(XE-2)/PR FUNC- TION switch (fig. 3-11) to RCVR-OSC position. Insert the P8A test probe (fig.

3-13) in the AN/PRR-9 (XE-9) TP1 test receptacle (fig. 317) through hole TP1 in the RE- CEIVER ALIGNMENT adapter.

Adjust C15 (hole A) for maximum meter indication. Adjustment of C15 should be clockwise if the new frequency is lower

than the previous frequency, or counterclockwise if the new frequency is higher. A one-quarter turn of C15 gives

approximately a 1-MHz change.

f. Turn the ID-1189(XE-2)/PR FUNC- TION switch to RCVR-COARSE RF. Turn RCVR TEST SIG. rotary switch

fully clock- wise, Place P8A test probe (fig. 3-13) through hole TP2 of the RECEIVER ALIGNMENT adapter into the TP2

receptacle (fig. 3-17) of the AN/PRR-9 (XE-9) electronic unit assembly. Adjust the ID-1189(XE-2)/PR FREQUENCY MC

control for the desired operating frequency. Rotate the FREQUENCY MC dial for maximum indication on the meter. If

the meter indication shows off-scale deflection, reduce the signal level by turning the RCVR TEST SIG. switch-

counterclockwise one or more steps. Readjust the FREQUENCY MC control for maximum meter indication.

CAUTION

Do not change the adjustment of the FREQUENCY MC

control for the remainder of the AN/PRR-9 (XE-9)

alignment.

g. Use the adjustment tool to adjust capacitors through holes B, C, and D of the RECEIVER ALIGNMENT adapter for

a peak meter reading. Readjust the RCVR TEST SIG. switch, if necessary, to maintain one-half scale or less meter

indication. Repeat adjustment of capacitors through holes B, C, and D. h. Repeat e above, then remove the P8A test;

probe from the TP1 hole.

i. Turn AN/PRR-9(XE-9) receiver control fully clockwise which sets the receiver for unsquelched operation.

j. Set the ID-1189(XE-2)/PR FUNCTION switch to RCVR-FINE RF. Turn RCVR TEST SIG. rotary switch fully

counterclockwise (minimum signal). Place the P5A receiver out- put connector (fig. 3-11) in the headset jack (fig. 3-16) of

the AN/PRR-9 (XE-9) electronic unit assembly.

k. Adjust capacitor C3 through hole C of the RECEIVER ALIGNMENT adapter for mini- mum meter reading.

l. Turn AN/PRR-9(XE-9). receiver control to OFF and then clockwise, not more than three-fourths turn to set receiver

for squelched operation (TM 11-5820-549-12-1).

m. Set ID-1189(XE-2)/PR FUNCTION switch to RCVR-SQUELCH. Leave P5A receiver output connector in headset

jack of receiver. Place RECEIVER ALIGNMENT adapter P8A test probe through hole TP1 into TP1 receptacle of

AN/PRR-9(XE-9) (fig. 3- 17.). Turn R5 through hole E of the RE- CEIVER ALIGNMENT adapter fully counter- clockwise.

Place SQUELCH switch of RECEIVER ALIGNMENT adapter (fig. 3-11) to ON. Slowly turn R5 clockwise through hole E

until the meter indicating needle swings up- scale. Leave R5 in this position. Turn RE- CEIVER ALIGNMENT adapter

SQUELCH switch to its off position. Meter indicating needle should swing downscale. The meter indicating needle should

swing upscale when RECEIVER ALIGNMENT adapter SQUELCH switch is ON, and downscale when SQUELCH switch

is in the off position. Remove P8A test probe from TP1.

n. Remove the RECEIVER ALIGNMENT adapter P5A receiver output connector from the headset jack of AN/PRR-

9(XE-9). Turn AN/PRR-9 (XE-9) receiver control fully counterclockwise to OFF. Remove the AN/PRR-9 (XE-9) electronic

unit assembly from the RECEIVER ALIGNMENT adapter.

Change 2

3-11