Version 16.10
AF-6600 AF-5000 Series Install Manual
120
Antenna Ground Plane
When a conventional aircraft monopole antenna is used it relies on a ground plane for correct
behavior. For ideal performance the ground plane should be very large compared to the wavelength of
reception, which is 305 mm. In a metal skinned aircraft this is usually easy to accomplish, but is more
difficult in a composite or fabric skinned aircraft. In these cases a metallic ground plane should be
fabricated and fitted under the antenna.
As the ground plane is made smaller, the actual dimensions of the ground plane become more critical,
and small multiples of the wavelength should be avoided, as should circles. Rectangles or squares are
much less likely to create a critical dimension that resonates with the transmissions. The smallest
practical ground plane is a square around 130 mm per side; as the size increases the performance may
actually get worse, but will be better by the time the ground plane is 780 mm on each side. Anything
much larger than that size is unlikely to show significant further improvement.
The thickness of the material used to construct the ground plane is not critical, providing it is
sufficiently conductive. A variety of proprietary mesh and grid solutions are available. Heavyweight
cooking foil meets the technical requirements, but obviously needs to be properly supported.
Antenna Cable
An acceptable cable:
•
Has less than 3.0 dB loss for the run length needed. For runs less than 17 feet, RG58 is
acceptable.
•
Has a characteristic impedance of 50 Ohms
•
If running the antenna cable in a bundle with or in close proximity to the transponder antenna
cable:
Has double braid screens or has a foil and braid screen. For runs less than 17 feet,
RG400 is acceptable.
When routing the cable, ensure that you:
•
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.
•
Keep the cable run as short as possible.
•
Avoid routing the cable round tight bends.
•
Avoid kinking the cable even temporarily during installation.
•
Secure the cable so that it cannot interfere with other systems.
Summary of Contents for AF-5000
Page 14: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 14...
Page 16: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 16 1 5 System Block Diagram...
Page 24: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 24 AF 5700 Panel Cutout...
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Page 54: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 54 11080 Aithre Altus O2 Wiring...
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Page 67: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 67 SV COM T25 or SV COM T8 Transceiver...
Page 76: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 76 AUDIO Panel PMA450EX PDA360R...
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Page 88: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 88 Garmin GPS 175...
Page 89: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 89 Garmin GTR 200...
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Page 149: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 149 5 Volt Sensor Power Wiring...
Page 151: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 151 Fuel Flow Transducer Wiring...
Page 153: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 153...
Page 212: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 212 Turbo Inlet Temp TIT...
Page 216: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 216 Flaps Trim Flap Position...
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Page 229: ...P N 53625 EFIS Expansion Network Harness...
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Page 262: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 262 APPENDIX W Harness Wiring Diagrams...
Page 263: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 263 P N 53600 EFIS Main Harness...
Page 264: ...Version 16 10 AF 6600 AF 5000 Series Install Manual 264 P N 538XX CHT EGT Harnesss...