INSTALLATION
SECTION 2
2) Modulate generator with a composite GS signal; set RF attenuator to 500
µ
V.
GS
Accuracy,
Centering:
±
1 needle width
GS Accuracy, .091 ddm: 1.5 dots
±
1 needle width
3) Apply centering GS signal; decrease RF attenuator to less that 0.2
µ
V; increase
attenuator slowly and note appearance of a full retract of G/S flag.
GS Flag Sensitivity: 20
µ
V maximum
E) 2 out of 5 Channeling (All outputs are active low. An external pullup will need to be used to
check for correct channeling)
1) Refer to Table 2.1 for channel coding.
2) With power applied to the NAV, connect a voltmeter between P810 pin 18 and ground.
VOR Channel: Pullup Voltage
LOC/GS Channel: +1V maximum
** NAV122D/GPS ONLY
F) GPS DISPLAY MODE
1) Connect a ground to pin 22 of P811
2) Verify that the frequency display now shows ‘GPS’
3) Press the OBS knob and verify that the frequency is recalled.
4) Channel the unit and verify that the frequency changes and is displayed for 2 seconds.
5) Remove the ground from pin 22 and apply 14V to pin 21 of P811. Repeat steps 2 thru 4
2-5
Summary of Contents for NAV122D
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