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g. Set XMTR 1 to 0 .
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-
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i. Set XMTR 1 to 0 .
tion of the voltmeter will increase.
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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.
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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
10.8 volts.