Installation
Procedures
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
2-43
practical from the ELT antenna. It is recommended that the installer use RG-142B or equivalent 50Ω
coax for the NAV antenna.
The GNS 480 incorporates an internal diplexor circuit. This means that the input VHF signal must not
strip the glideslope (330 MHz) signal from the NAV (108 MHz) signal.
Do not install an external
diplexor
. It is recommended that a single VOR/Localizer/Glideslope antenna be used for the
installation. Most VOR/LOC-only antennas will still provide an adequate glideslope signal for the GNS
480 to operate normally.
If two nav receivers (e.g. one GNS 480 and one SL30) are installed in the aircraft, a splitter must be used.
Installations should use an appropriate splitter, such as the Mini-Circuits ZFSC-2-1B BNC, available as
an option under the Garmin AT part number 115-0007.
2.10 W
EIGHT AND
B
ALANCE
Weight and balance computation is required after the installation of the GNS 480. Follow the guidelines
as established in AC 43.13-1B, Chapter 10, section 2. Make appropriate entries in the equipment list
indicating items added, removed, or relocated along with the date accomplished. Include your name and
certificate number in the aircraft records. Table 2-12 identifies the weight of the new GNS 480
equipment and Figure 2-12 shows the center of gravity.
Table 2-12 - Unit Weights
Item Weight
GNS 480 only
5.8 lbs. (2.6 kg)
GNS 480 mounting tube only
0.7 lbs. (0.3 kg)
2.11 E
LECTRICAL
L
OAD
A
NALYSIS
An electrical load analysis should be completed on each aircraft prior to installation in accordance with
AC 43.13-1B, Chapter 11. Use the following values for computation:
Table 2-13 - Unit Power Loads
14 VDC
28 VDC
GNS 480 Input
Typical Max Typical Max
GNS 480 Main Power (P1 connector)
with heater off
(1)
with heater on
(1)
1.4 A
2.4 A
2.2 A
3.2 A
700 mA
1.2 A
1.1 A
1.6 A
GNS 480 Nav Power (P7 connector)
450 mA
700 mA
200 mA
350 mA
GNS 480 Com Power (P4 connector)
receive
transmit
270 mA
2.1 A
350 mA
3.2 A
130 mA
1.0
175 mA
1.6
Notes:
(1) Backlight heater element turns on when internal temperature is below approximately 42
°
C.
Содержание GNS 480
Страница 1: ...GNS 480 CNX80 Color GPS Nav Com Installation Manual September 2004 560 0982 01 Rev A...
Страница 10: ...Table of Contents viii 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 30: ...General Information 1 20 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 41: ...Installation Procedures GNS 480 CNX80 Installation Manual560 0982 01 Rev A 2 11 Figure 2 3 GNS 480 Dimensions...
Страница 126: ...Periodic Maintenance 6 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 144: ...Appendix B Serial Interface Specifications B 16 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 148: ...Appendix C Equipment Compatibility C 4 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 150: ...Appendix D Interconnect Diagrams D 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 182: ...Appendix E Acceptable Aircraft by Evaluation E 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Страница 184: ...Appendix F Optional Accessories Not Supplied F 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
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