190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 19-6
Canada. To reduce potential radio interference to other users, the antenna type and its
gain should be so chosen the equivalent isotropically radiated power (e.i.r.p.) is not more
than that necessary for successful communication.
The GTR 20 has been approved by Industry Canada to operate with the antenna types
listed below. Antenna types not included in this list, having a gain greater than the
maximum gain indicated for that type, are strictly prohibited for use with this device.
A COM Antenna that meets TSO-C37( ) and C38( ) or TSO-C169( ), 50W, vertically
polarized. Maximum gain of 1 dBi with an impedance of 50 Ω.
19.5.2 Interference of GPS
On some installations, VHF COM transceivers, Emergency Locator Transmitter (ELT) antennas, and
Direction Finder (DF) receiver antennas can re-radiate to the GPS antenna. Placement of the GPS antenna
relative to a COM transceiver and COM antenna (including the GTR/ COM antenna), ELT antenna, and
DF receiver antenna is critical.
Use the following guidelines, in addition to others in this document, when locating the GTR 20 and its
antenna.
• Locate the GTR 20 as far as possible from all GPS antennas.
• Locate the COM antenna as far as possible from all GPS antennas.
If a COM is found to be radiating, the following can be done:
• Replace or clean VHF COM rack connector to provide good coax ground.
• Place a grounding brace between the GTR 20 and ground.
• Shield the GTR 20 wiring harness.
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