Installation and Configuration
DV14307.03 Issue 06 February 2021 Transceivers 6200 Series 67
A safe distance to the installed antenna must be ensured by corresponding
installation measures around human body damage (e.g. at the eyes) and/or
prevent the inflammation of combustible materials by radiated energy.
2.6.3.1 Antenna Type
Recommended antenna types:
• Vertical polarized 50 Ω broadband aircraft COM antenna.
• The antenna must be able to radiate RF energy evenly and omnidirectional.
2.6.3.2 Antenna Installation Details
• The aircraft-certifying inspector could support you in questions on how to achieve best
results in all directions (installation instructions must be fully complied with).
• For aircraft with metal fuselage we recommend a rod antenna.
• The antenna should be installed vertically (as far as) on or under the fuselage.
• The antenna installation location should be of an even surface and in a safe distance from
horizontally screening metal parts (propeller, undercarriage, vertical metal fins etc.), for
maximum radio range in all (horizontal) directions.
• The VHF Com1 and VHF Com2 must be installed with at least ½ wavelength (of the
antenna operating frequency) distance between antennas. It is necessary to have an
antenna separation of min. 45 dB.
• The distance to other aircraft antennas (COM, NAV antennas), should be at least 1.5 m.
• The antenna installation area should be as flat as possible.
• When two radios are used:
o It is necessary to have an antenna separation of min. 45 dB. This must be guaranteed
by the installer.
o It could be that operational degradations may apply, this must be documented from the
installer and approved for airworthiness.
• Make sure that the metallic contact between aircraft surface/structure and the antenna
cable outer conductor (shield) is adequate/solid.
o Never use a location on paint-coated surfaces!
o The electrical contact must be continuously good safe against vibration.
• For wood and fiberglass (GRP) aircraft (reinforcing the mounting location):
o 3 or 4 aluminum strips (each 60 cm long/5 cm wide) are recommended.
o The stripes must be put (mostly) horizontally with a shape as a star or cross.
o These counter weights must be centrally screwed together with the antenna socket to
ensure a continuous, electrically good contact.
• For aircraft with non-metallic surface structure inside the fuselage:
o A metal foil (min. 60x60 cm) can be stuck in.
o The antenna socket must be installed in the foil center, in addition with a metallic
ground contact support plate.
• For aircraft with fuselage and/or tail-fin made of non-conductive material:
o A vertical folded top antenna is suitable.
o The installation must be made preferably during manufacturing the tail-fin.
Carbon fiber is conductive and can shield the antenna!
• Careful sealing of all holes/openings of the outer skin is mandatory.
o Make sure, that electrical contacts are continuously good, even under bad
environmental conditions.
o Use only high quality 50 Ω coax cable type RG400 or higher quality.
o Prevent any sharp cable bend (radius > 50 mm), and any excessive coax cable length.
o Put all wiring including antenna cable away from other wiring which carries heavy
AC currents and away from any aircraft controls.
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