Garmin GTR 200 GTR 200 Installation Manual - Page 20

Installation Considerations, 2.5 Antenna Considerations, Optional Accessories, COM Antenna - comm

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2.3.2 Optional Accessories Table 2-4 Optional Accessories Item Part Number 4 GB Micro SD Card (w/SD adapter) 010-10683-05 2.4 Installation Considerations 2.4.1 COM Antenna A COM Antenna that meets TSO-C37( ) and C38( ) or TSO-C169( ), 50W, vertically polarized with coaxial cable is recommended but not provided. 2.4.2 Installation Materials The GTR 200 is intended for use with the standard aviation accessories. The following items are required for installation, but not supplied: • Wire (MIL-W-22759/16 or equivalent) • Shielded Wire (MIL-C-27500 or equivalent) • Hardware - #6-32 x 100° Flat Head SS Screw [(MS24693, AN507R or other approved fastener) (6 ea.)] and #6-32 Self-Locking Nut [MS21042 or other approved fastener (6 ea.)] • Push/Pull (that can be manually reset) Circuit Breaker • Tie Wraps or Lacing Cord • Ring Terminals (for grounding) • Coaxial Cable (RG-400, RG-142B or coaxial cable with 50 Ω impedance meeting applicable aviation regulations should be used. 2.5 Antenna Considerations This section contains mounting location considerations for the antennas required for the GTR 200. For mounting the COM antenna, refer to the aircraft manufacturer's data. 2.5.1 COM Antenna Location The GTR 200 COM antenna should be well removed from all projections, engines and propellers. The ground plane surface directly below the antenna should be a flat plane over as large an area as possible (18 inch square, minimum). The antenna should be mounted a minimum of six feet from any DME or other COM antennas, and four feet from any ADF sense antennas. The COM antenna should also be mounted as far as practical from the ELT antenna. Some ELTs have exhibited re-radiation problems that cause interference with other radios, including GPS. This can happen when the COM (GTR 200 or any other COM) is transmitting on certain frequencies such as 121.15 or 121.175 MHz, which may cause the ELT output circuit to oscillate from the signal coming in on the ELT antenna coax. If simultaneous use of two COM transceivers is desired (split-COM or simul-comm), the COM antennas should be spaced for maximum isolation. A configuration of one topside antenna and one bottom side antenna is recommended. The GTR 200 requires a transmit interlock. Simultaneous COM performance varies significantly across installations and is affected by both the isolation between the COM antennas and the separation of the tuned frequencies. Each installation should be individually examined to determine the expected performance of simultaneous COM. GTR 200 Installation Manual Page 2-2 190-01553-00 Rev. A

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GTR 200 Installation Manual
190-01553-00
Page 2-2
Rev. A
2.3.2
Optional Accessories
2.4
Installation Considerations
2.4.1
COM Antenna
A COM Antenna that meets TSO-C37( ) and C38( ) or TSO-C169( ), 50W, vertically polarized with
coaxial cable is recommended but not provided.
2.4.2
Installation Materials
The GTR 200 is intended for use with the standard aviation accessories. The following items are required
for installation, but not supplied:
•
Wire (MIL-W-22759/16 or equivalent)
•
Shielded Wire (MIL-C-27500 or equivalent)
•
Hardware - #6-32 x 100° Flat Head SS Screw [(MS24693, AN507R or other approved fastener)
(6 ea.)] and #6-32 Self-Locking Nut [MS21042 or other approved fastener (6 ea.)]
•
Push/Pull (that can be manually reset) Circuit Breaker
•
Tie Wraps or Lacing Cord
•
Ring Terminals (for grounding)
•
Coaxial Cable (RG-400, RG-142B or coaxial cable with 50
Ω
impedance meeting applicable
aviation regulations should be used.
2.5
Antenna Considerations
This section contains mounting location considerations for the antennas required for the GTR 200.
For
mounting the COM antenna, refer to the aircraft manufacturer’s data.
2.5.1
COM Antenna Location
The GTR 200 COM antenna should be well removed from all projections, engines and propellers.
The
ground plane surface directly below the antenna should be a flat plane over as large an area as possible (18
inch square, minimum).
The antenna should be mounted a minimum of six feet from any DME or other
COM antennas, and four feet from any ADF sense antennas.
The COM antenna should also be mounted as
far as practical from the ELT antenna.
Some ELTs have exhibited re-radiation problems that cause
interference with other radios, including GPS.
This can happen when the COM (GTR 200 or any other
COM) is transmitting on certain frequencies such as 121.15 or 121.175 MHz, which may cause the ELT
output circuit to oscillate from the signal coming in on the ELT antenna coax.
If simultaneous use of two COM transceivers is desired (split-COM or simul-comm), the COM antennas
should be spaced for maximum isolation.
A configuration of one topside antenna and one bottom side
antenna is recommended.
The GTR 200 requires a transmit interlock.
Simultaneous COM performance varies significantly across installations and is affected by both the
isolation between the COM antennas and the separation of the tuned frequencies.
Each installation should
be individually examined to determine the expected performance of simultaneous COM.
Table 2-4
Optional Accessories
Item
Part Number
4 GB Micro SD Card (w/SD adapter)
010-10683-05