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Garrecht Avionik GmbH
TRX-2000 ADS-B Traffic Monitor
User Manual
Revision: 1.0b
14
19 DEC 2011
2.3. Antenna installation
2.3.1. General
Choosing an appropriate position
For best transmitting and receiving performance, ADS-B and FLARM(R) antenna must be installed in
vertical position. The GPS antenna has to be installed in horizontal position.
All antenna must not be covered by conductive material (aluminium, carbon fibre). If no appropriate
position can be determined, antennas need to be installed outside at appropriate position. Antennae for
utside installation and antenna line extensions are not delivered with the device and must be purchased
seperatly.
Each antenne must be installed in a manner to have free line of sight in all directions. Metal parts (i.e.
engine, prop, gear) close to the antenne may reduce the device receiving and transmitting performance.
Minimum distance to NAV/COM antennas is 1m (3ft), to transponder and / or DME antenna is 2m (6ft).
Antenna ground plane
Stub antennas (
λ
/4 beamer) always require the use of a conductive antenna ground plane. In wooden
or fibre glas made airframes, a conductive ground plane (metal film, sheet metal, size: as large as
practical) has to be installed. Antennas need to be in the center of this ground plane. To small ground
plane may reduce the antenna performance. A proper conductive connection between antenna foot and
groundplane is essential. Insulating covers (painted or oxidzed) need to be sanded in the place of
contact with the antenna foot to provide an conductive connection.
The TRX-2000 comes with a aluminum sheet ground plane for installation of Flarm- and ADS-B
antenna. Do not reduce the size of this ground plane.
Important
2.3.2. Antenne cable and connectors
Handle the antenna lines carefull and avoid sharp bends or damaging the antenna line during
installation to avoid reducing system performance. Depending on the cable type, keep a minimum
radius of 1-5 cm (smaller radius for smaller cables).
Line extensions has to be performed in accordance with good workmanship using appropriate
connectors and cable types (Impedance: 50 Ohms). For adopting to other connector types, always use
industrial made connectors to reduce attenuation.
Do not reduce the length of supplied cables. Tie unused cable in 8-shape loops.
Nuts of used SMA connectors (ADS-B antenna connector of TRX-2000) may be screwed down tight
carefully only to avoid damaging the antenna connector.
2.3.3. ADS-B Antenna
Whenever possible, use the supplied
λ
/4 - 1090 MHz stub antenne (shorter antenna) for installation on
the instrument panel cover.
An appropriate groundplane is supplied with the TRX-2000 as well as nuts for antenna installation and
antenna line for connecting the antenna to the TRX-2000
If using antennae installed in the instrument panel cover which are part of the
removable canopy (i,e, gliders), always use pull to release connectors types
to avoid proper canopy release in case of emergency exit.