Garmin GNC 420A Installation Manual page 53

4.8.2.4 Flag
Pin Name
VOR/LOC +FLAG
VOR/LOC -FLAG (VOR/LOC COMMON)
GLIDESLOPE +FLAG
GLIDESLOPE +DOWN/-FLAG (GLIDESLOPE
COMMON)
The Flag output is capable of driving up to three 1000 Ω meter loads. When valid information is present
(Flag OUT OF VIEW) the Flag output is 375 ±80 mV
VIEW) the Flag output is 0 ±25 mV
4.8.2.5 OBS
Pin Name
VOR OBS ROTOR C
VOR OBS ROTOR H (GROUND)
VOR OBS STATOR D
VOR OBS STATOR F
VOR OBS STATOR E/G (VOR/LOC
COMMON)
VOR OBS ROTOR C and H are a buffered 500 Hz output that is intended to drive the OBS rotors. VOR
OBS STATOR D and VOR OBS STATOR F are each phase and amplitude shifted version of the VOR
ROTOR C output. Each pair is intended to read one of the two windings of the indicator's OBS stator.
4.8.2.6 VOR/LOC COMPOSITE
Pin Name
VOR/LOC COMPOSITE OUT
With a Standard VOR Test Signal applied, VOR/LOC COMPOSITE OUT is 0.5 ±0.1 V
load. With a Standard Localizer Centering Test Signal applied, VOR/LOC COMPOSITE OUT is 0.350
±0.05 V into a 10 kΩ load.
RMS
4.8.2.7 ILS ENERGIZE
Pin Name
ILS ENERGIZE
The driver output voltage is not more than 1.0 V when sinking 20 mA. The maximum off state leakage
current with respect to GND is less than 10 µA.
4.8.3 VOR/ILS Indicator Configuration
Refer to section 5.2.13 for the VOR/LOC/GS configuration.
4.8.4 VOR/ILS Indicator Calibration and Checkout
Refer to section 5.2.13 for the VOR/LOC/GS checkout.
4.8.5 VOR/ILS Indicator Interconnect
Refer to Figure 4-21 on page 4-61 for the VOR/ILS indicator interconnect.
400 SERIES INSTALLATION MANUAL
P/N 190-00140-02
Connector
P4006
P4006
P4006
P4006
When invalid information is present (Flag IN
DC.
DC.
Connector
P4006
P4006
P4006
P4006
P4006
Connector
P4006
Connector
P4006
Pin I/O
3 Out
4 Out
30 Out
31 Out
Pin I/O
9 Out
10 Out
13 In
12 In
11 Out
Pin I/O
8 Out
into a 10 kΩ
RMS
Pin I/O
29 Out
Page 4-17
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