SYSTEM INSTALLATION MANUAL
89000016
location with respect to blockage from all aircraft components at typical level cruising
attitude, as well as minimizing the effects of aircraft shadowing during typical maneuvers.
(d)
The antenna must be separated as much as practical from transmitting antennas. For
small aircraft, the antenna also must be separated as much as practical from the
windscreen to prevent case-to-antenna coupling.
(e)
For installations on rotorcraft, the effects of the rotor blades on antenna performance
must be considered. This can require additional equipment functional flight evaluation or
analytical evaluation to confirm the suitability of antenna location.
(f)
For multiple-sensor installations, the installer must reduce the likelihood that a single
lightning strike affects all the sensors.
B.
Antenna Power
(1)
The internal GPS of the KGX 150 series utilizes an active antenna which means the antenna
includes a low noise amplifier. The power for the low noise amplifier is provided from the GPS
receiver through the antenna coax cable. No other installation considerations are necessary.
C.
Recommended Cable
(1)
RG400 or RG142 cable with a maximum length of 50 feet (15.24 m) is recommended. The
cable including connectors, loss must not exceed 10 dB. For antennas mentioned in Paragraph
4.B. , RG400 or RG142 cable with a maximum length of 25 feet (7.62 m) is recommended.
The cable including connectors, loss must not exceed 5 dB.
D.
SATCOM Compatibility
(1)
The KGX 150 series internal GPS/WAAS sensor has been shown through testing to be
specification compliant for single-channel SATCOM compatibility in accordance with RTCA
DO-229D.
(2)
Extra care must be exercised when installing GNSS equipment on aircraft with SATCOM
having multiple channels, as cautioned in Section 14-1 of AC 20-138B: “GNSS equipment
is particularly susceptible to out-of-band SATCOM emissions and in-band inter-modulation
between multiple channel SATCOM installations. GNSS equipment must not be installed in
aircraft with multiple SATCOM channels unless the simultaneous use of interfering frequencies
can either be prevented or demonstrated not to interfere with the operation of the GNSS
equipment.”
16. KGX Control Panel Static Pressure Connection
A.
General
(1)
The KGX control panel includes an altitude encoder which must be connected to the same
source of static pressure as the primary altimeter on the aircraft if this sensor is utilized
in the installation. The KGX control panel static pressure port provides a mounting spigot
intended for nominal 0.2 inch (5 mm) or 3/16-inch (4.8-mm) inside diameter tubing. A 0.2
inch (5 mm) EPDM rubber tubing is included in the installation kit to facilitate connection to
the aircraft static system.
(2)
Choose a point in the existing static pressure line that is as close as practical to the KGX
control panel. Cut the static pressure line, and use the supplied T-fitting to connect the
altitude encoder. Take care not to contaminate the inside of the static line when cutting or
inserting the connectors.
(3)
Figure 1007 shows the general arrangement, although other combinations can be used.
EFFECTIVITY
ALL
Page 1024
22 Dec 2016
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