TY91/TY92 VHF Radio Installation Manual 24 November 2014
00839-00 Issue AF
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Trig Avionics Limited 33
5.10.3 Audio wiring
For any wires carrying an audio signal, a screened twisted pair should be used
to avoid any unwanted signals interfering with the radio installation.
Unscreened wires can act as small antennas and transmissions from other
avionics on the aircraft could be picked up by the radio and heard as
interference in the connected headsets. For example, Mode S transponder
transmissions can be audible as clicking sounds in the headset and cause an
annoying distraction to the pilot.
Correctly terminated screened wiring will limit any unwanted transmissions
being picked up by the radio and should be used on the MIC and PHONE
lines.
5.11 Antenna Installation
The antenna should be installed according to the manufacturer’s instructions.
The following considerations should be taken into account when siting the
Antenna.
The antenna should be well removed from any projections, the
engine(s) and propeller(s). It should also be well removed from
landing gear doors, access doors or others openings which will break
the ground plane for the antenna.
Avoid mounting the antenna within 2 feet of a GPS antenna, and as far
as practical from any ELT antenna.
If the simultaneous use of two radio units is required then each
antenna should be as far apart as practicable for maximum isolation.
We would recommend placing one antenna on top and one on the
bottom of the airframe. The Transmit Interlock function should also
be used in this case (section 5.6.8).
Where practical, plan the antenna location to keep the cable lengths as
short as possible and avoid sharp bends in the cable to minimise the
VSWR.
Electrical connection to the antenna should be protected to avoid loss of
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