ADS-B FDL-DB Dual Band Series
Installation Manual
Document No. 88552 Rev A
2-36
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RG-174
27.1
7.4
RG-316
25.8
7.76
RG-400
14.5
13.8
RG-142
12.8
15.64
RG-393
7.5
26.7
When routing the cable, ensure the following:
•
Route the cable away from sources of heat.
•
Route the cable away from potential interference sources such as ignition wiring, 400Hz
generators, fluorescent lighting, and electric motors.
•
Allow a minimum separation of 12 in (300 mm) from an Automatic Direction Finder
(ADF) antenna cable.
•
Keep the cable run as short as possible.
•
Avoid routing the cable around tight bends.
•
Avoid kinking the cable even temporarily during installation.
•
Secure the cable so that it cannot interfere with other systems.
2.11
GPS Antenna Installation
Shadowing by aircraft structure (and in some cases by rotorcraft blades) can
adversely affect operation of the Global Navigation Satellite System (GNSS)
equipment.
The antenna should be installed according to the manufacturer’s instructions.
Selecting appropriate GPS antenna locations is critical to the proper performance of the FDL-
DB Series. Consider the following when selecting the Antenna location.
•
Typically, a GNSS antenna is located forward or aft of the wings on top of the fuselage.
•
GNSS antennas must be installed to provide the widest, unobstructed view of GNSS
satellites.
•
Antenna placement on the airframe should be optimized to ensure the sensor can take
full advantage of a 5-degree mask angle. This includes consideration of antenna 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.
•
The antenna should be separated as much as practical from transmitting antennas. For
small aircraft, the antenna should also be separated as much as practical from the
windscreen to prevent case-to-antenna coupling.
•
For installations on rotorcraft, the effects of the rotor blades on antenna performance
should be considered. This may require additional equipment functional flight evaluation
or analytical evaluation to confirm the suitability of antenna location.
