Garmin Apollo CNX80, Installation Manual

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Installation Procedures
Apollo CNX80 Installation Manual 560-0982-00 Rev D
2-41
practical from the ELT antenna. It is recommended that the installer use RG-142B or equivalent 50 Ω coax
for the NAV antenna.
The CNX80 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 Apollo CNX80 to operate
normally.
If two nav receivers (e.g. one CNX80 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 CNX80. 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 2-11 identifies the weight of the new CNX80 equipment
and Figure 2-12 shows the center of gravity.
Table 2-11 - Unit Weights
Item Weight
CNX80 only 5.8 lbs. (2.6 kg)
CNX80 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 2-12 - Unit Power Loads
14 VDC 28 VDC
CNX80 Input
Typical Max Typical Max
CNX80 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
CNX80 Nav Power (P7 connector) 450 mA 700 mA 200 mA 350 mA
CNX80 Com Power (P4 connector)
receive
transmit
270 mA
2.1 A
1.8 A
3.2 A 130 mA
1.0
900 mA
1.6
Notes:
(1) Backlight heater element turns on when internal temperature is below approximately 42
°
C.