Figure 3-4. Indicator, Channel alignment ID-1189/PR-9 alignment position.

TM 11-6625-937-12

Figure 3-4. Indicator, Channel alignment ID-1189/PR-9 alignment position.

serted in the XMTR BAT. receptacle while aligning the AN/PRT-4. Plug the AN/PRT-4 into the XMTR ALIGN.

d. Preparing AN/PRR-9(XE-9) for Alignment. Follow procedures in paragraph 3-6.1.

3-5. Alignment of Receiving Set, Radio AN/PRR-9 (figs. 3-1, 3-6, and 3-7)

NOTE

Any transmitter generating a strong signal of a like, or near like, frequency in the vicinity

of the AN/PRR-9 being aligned, may cause faulty alignment or difficulty in alignment.

a. Perform preparatory procedures given in paragraph 3-b.

b. Check the condition of the ID-1189/PR internal battery (para 3-3c). Replace battery if necessary.

c. Use the alignment tool from the ID-1189/PR lid to set the AN/PRR-9 capacitors through holes B, C, and D in the

RECEIVER ALIGNMENT receptacle, according to the approximate settings for 47 megacycles (mc), 51 mc, or 57 rnc

shown in figure 3-7. For channel frequencies not shown, approximate the settings proportionately between those shown.

d. Turn the AN/PRR-9 receiver control (TM 11-5820-549-12) about one-half turn clockwise from the OFF position.

e. Turn the ID-1189/PR FUNCTION switch (fig. 3-1) to RCVR-OSC. Insert the ID-1189/PR TEST PROBE into the

AN/PRR-9 TP 1 jack (fig. 3-6) through hole TP 1 in the RECEIVER ALIGNMENT receptacle.

Change 2 3-5