Eight And Alance; Electrical Load Analysis; Table 2-12 - Unit Weights; Table 2-13 - Unit Powerl - Garmin GNS 480 Installation Manual

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
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.
Item
GNS 480 only
GNS 480 mounting tube only
2.11 E
LECTRICAL
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:
GNS 480 Input
GNS 480 Main Power (P1 connector)
with heater off
with heater on
GNS 480 Nav Power (P7 connector)
GNS 480 Com Power (P4 connector)
receive
transmit
Notes:
(1) Backlight heater element turns on when internal temperature is below approximately 42°C.
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
B
ALANCE

Table 2-12 - Unit Weights

L A
OAD NALYSIS
Table 2-13 - Unit Power Loads
(1)
(1)
Weight
5.8 lbs. (2.6 kg)
0.7 lbs. (0.3 kg)
14 VDC
Typical Max
1.4 A 2.2 A
2.4 A 3.2 A
450 mA 700 mA
270 mA 350 mA
2.1 A 3.2 A
Installation Procedures
28 VDC
Typical Max
700 mA 1.1 A
1.2 A 1.6 A
200 mA 350 mA
130 mA 175 mA
1.0 1.6
2-43