Section V
Paragraphs 5-4 to 5-6
e. Allow the SG-13/ARN to warm up for at least 15
j. Repeat steps a through i for each setting of the
minutes and red line the meter.
SG-13/ARN VOR switch. VOR error should not ex-
ceed 0.75 at any setting of the VOR switch.
f. Set AUDIO SELECTOR to TONE LOC, MICRO-
VOLTS dial to 1000, and LOC-GS control to the center
CHECK.
of the white segment (on course). The crosspointer
current as read on the Model 901 microammeter
should be 0 8 microampere.
a. Connect Signal Generator SG-l/ARN modulated
with Modulator MD-83A/ARN to an AN/ARN-14 re-
5-6. TONE LOCALIZER 6-DB ACCURACY CHECK.
ceiver equipped with Course Indicator ID-249A/ARN.
Use a 6-db, 53-ohm attenuator pad at the receiver in-
a. Perform steps a and b of paragraph 5-5.
put and connect Weston Model 901 microammeter in
parallel with the NAV crosspointer coil in ID-249A/
ARN. See B of figure 5-1 for connections.
b. Modulate the SG-1/ARN with a 4-db left tone
localizer signal and adjust the receiver for 90 micro-
b. Set the frequencies of the receiver and signal
ampere crosspointer current.
generator to 110.1 mc and adjust the SG-1/ARN out-
put level for 500 microvolts.
c. Perform steps d and e of paragraph 5-5.
c. Modulate the SG-1/ARN with a zero db tone local-
d. Set AUDIO SELECTOR to TONE LOC, MICRO-
izer signal and adjust the receiver for zero cross-
VOLTS dial to 1000, and LOC-GS control to the top
pointer current. Refer to receiver handbook for lo-
line of the left segment (6-db left tone localizer sig-
cation of this adjustment.
nal) The crosspointer current should be 135 15
microamperes.
d. Substitute Signal Generator SG-13/ARN set to
110.1 mc for the MD-83A/ARN and SG-l/ARN com-
e. Repeat steps a through d above for a 6-db right
bination. See A of figure 5-1 for connections.
tone localizer signal.
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