Power, Lighting, And Antennas - Garmin GNC 420A Installation Manual

4.2

POWER, LIGHTING, AND ANTENNAS

4.2.1 Power, Lighting, and Antennas Function
The section covers the Power Input requirements, Lighting Bus input, and Antenna connections.
4.2.2 Power, Lighting, and Antennas Electrical Characteristics
4.2.2.1 Aircraft Power
Pin Name
AIRCRAFT POWER 1
AIRCRAFT POWER 1
AIRCRAFT POWER 2 *
AIRCRAFT POWER 2 *
AIRCRAFT POWER
AIRCRAFT POWER
AIRCRAFT POWER
AIRCRAFT GROUND
AIRCRAFT GROUND
AIRCRAFT GROUND
AIRCRAFT GROUND
AIRCRAFT GROUND
* Optional alternate power, applies only to part numbers 011-00280-30 GNS 430, 011-00836-10 GNS 430(A, 011-
00506-30 GNC 430, 011-00837-10 GNC 420(A), and 011-00504-10 (GPS 400).
To operate the GNC 420 P/N 011-00506-00 or GNS 430 P/N 011-00280-00 COM transceiver in a 14-volt
aircraft, a 14 to 28 volt converter such as a KGS Electronics models RB-126 or UC-14-28 or equivalent
must be used. The voltage converter should include a circuit breaker on its output to supply power to
P4002-11 and P4002-12 for the COM transmitter. The other power input pins (P4001-19, P4001-20, and
P4006-44) accept 11-33 V
V on all power inputs. Refer to Figure 4-5 on page 4-29.
DC
A power connection on P4006-44 is only required if NAV SUPERFLAG and/or G/S SUPERFLAG is
utilized.
The power inputs P4001-19 and P4001-20 provide power for all functions of the 400 Series unit except the
COM transmitter and the NAV & G/S SUPERFLAG outputs.
4.2.2.2 Lighting Bus
Pin Name
LIGHTING BUS HI
LIGHTING BUS LO
The 400 Series unit can be configured to track 28 V
inputs. Alternatively, the 400 Series unit can automatically adjust for ambient lighting conditions based on
the photocell. Refer to section 5.2.5.
4.2.2.3 Antennas
Pin Name
GPS ANTENNA
COM ANTENNA
VOR/LOC ANTENNA
GLIDESLOPE ANTENNA
400 SERIES INSTALLATION MANUAL
P/N 190-00140-02
CAUTION
. GNC 420 P/N 011-00506-10 and GNS 430 P/N 011-00280-10 accept 11-33
DC
DC
Connector Pin
P4001 19
P4001 20
P4001 15
P4001 72
P4002 11
P4002 12
P4006 44
P4001 77
P4001 78
P4002 21
P4002 22
P4006 41
Connector Pin
P4001 39
P4001 40
, 14 V , 5 V or 5 V lighting buses using these
DC DC AC
Connector I/O
P4003 In
P4004 I/O
P4005 In
P4007 In
I/O
In
In
In
In
In
In
In
--
--
--
--
--
I/O
In
In
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