Table 4. Heading Dial Check

g. Set XMTR 1 to 0 .

Table 4. Heading Dial Check

h. Adjust the TI synchronizing knob to obtain each of

Voltmeter Connection TB2

TI Heading Dial Indication

the voltmeter nulls listed in table 4. For each null position,

28 to 30

60° ± 1°, 30 minutes

the amount of rotation of XMTR 1 needed to set the

29 to 30

120° ±1°, 30 minutes

heading dial to the corresponding heading will be 0° ± 1°,

28 to 29

180° ± 1°, 30 minutes

28 to 30

30 minutes. Tap the TI prior to taking any readings.

240° ± 1°, 30 minutes

29 to 30

300° ± 1°,30 minutes

Return XMRT 1 to 0° after each step and make test con-

nection changes as indicated.

c. Slowly adjust XMTR 1 from 0° to 30°. The indica-

i. Set XMTR 1 to 0 .

tion of the voltmeter will increase.

j. Adjust the TI synchronizing knob to align the head-

d. Reset XMTR 1 to 0 .

ing dial N mark with the major index.

e. Slowly rotate the TI synchronizing knob approx-

k. Set primary power S1 to OFF.

imately 1/4 turn clockwise. The indication of the voltmeter

l. Set XMTR 1 to 170°.

will increase.

m. Set primary power S1 to ON. The time required for

12. Tests of Heading Differential (B1-B). a. Remove

the voltmeter (A2) leads from TB 2-25 and TB 2-27 and

the heading dial to come to rest at 170° as measured with

stopwatch (B2) will be no more than 8 seconds.

connect them to TB 2-28 and TB 2-30.

n. Rotate XMTR 1, causing heading dial to rotate

b. Adjust the TI synchronizing knob to align the head-

through 360°, at a rate of approximately 2-revolutions-

ing dial N mark with the major heading index. The

per-minute. Any sticking or binding will not cause the

voltmeter will indicate approximately 10.2 volts.

heading dial to lag the XMTR 1 indication by more than

c. Slowly adjust XMTR 2 from 0° to 30°. The indica-

3°.

tion of the voltmeter will increase.

11. Tests of Heading Differential (B1-A). a. Remove

d. Reset XMTR 2 to 0 .

the voltmeter (A2) leads from TB 2-29 and TB 2-30 and

e. Slowly rotate the TI synchronizing knob approx-

imately 1/4 turn clockwise. The indication of the voltmeter

connect them to TB 2-25 and TB 2-27.

Will decrease.

b. Set XMTR 1 to 0°. Adjust the TI synchronizing

knob to align the heading dial N mark with the major

f. Set primary power S1 to OFF.

heading index. The voltmeter will indicate approximately

13. Tests of Radio Bearing Pointer (RBP). a. Connect

equipment as shown in figure 4.

10.8 volts.