Garmin GNC 420A Installation Manual page 20

HSI/CDI Indicator or EFIS
This device displays Nav Flag, Left/Right, To/From, Glideslope Flag, and Up/Down. The indicator(s)
used in conjunction with the GNS 430 VOR/ILS receivers shall be TSO'd.
Qualified GPS Antenna
This antenna must be one of those listed in the accessories list, or meet the following requirements:
1. DO-160C Environmental Conditions
The antenna shall meet the environmental conditions listed below and shall conform to the test
requirements of RTCA DO-160C.
Environmental Condition
Temperature (operating)
(ground survival)
Altitude
Temperature Variation
Humidity
Vibration
Waterproofness
Fluids
Lightning
Icing
2. Electrical Characteristics
LNA Supply voltage
LNA Supply Current
LNA Operating Frequency
LNA Gain
LNA Noise Figure
LNA Output VSWR (50 Ω)
LNA Input power at -1 dB Gain Compression
LNA Bandwidth
(-3 dB)
(-20 dB)
(-40 dB)
3. Radiation Characteristics
Polarization
Operating Frequency
Gain (on axis)
o
(at 160 beam width)
Cross Pole Gain (LHCP)
(on axis)
o
(at 160 beam width)
4. Mounting Requirements
Cable connection
Mounting studs
Page 2-4
Rev N
Category Description
F2 -55 to +70
F2 -55 to +85
F2 55,000 feet
o
A 10 C per minute
C 95% at +55
CLMY Turbo/Reciprocating/Helicopter
S Continuous Stream
F Deicing Fluid
2A Direct Effects
C 0.15" thick
4.5 ± 0.5 V
DC
20 mA Maximum
1575.42 ± 2.00 MHz
20 dB Maximum, 12dB Minimum
3.0 dB Maximum
2:1 Maximum
-6 dB Minimum
40 MHz Maximum
100 MHz Maximum
250 MHz Maximum
RHCP
1575.42 ± 2.00 MHz
2.0 dBic Minimum
-6.0 dBic Minimum
-8 dBic Maximum
-9 dBic Maximum
BNC Female
Four 8-32 UNC-2A studs 0.50" long
400 SERIES INSTALLATION MANUAL
o
C
o
C
o
C
P/N 190-00140-02