Garmin GDL 50, Руководство по установке

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190-02087-10 GDL 50(R)/51(R)/52(R) Installation Manual
Rev. 2 Page 3-3
3.7 Antenna Installation
3.7.1 ADS-B Antenna Installation
The GDL 50/52 units include an ADS-B antenna. An optional blade-type ADS-B antenna mounted on the
bottom exterior of the aircraft can be connected to the GDL 50/52 via a cable connection to the unit's MCX
connector.
The GDL 50R/52R requires an external ADS-B antenna for reception. The antenna should be mounted on
the bottom of the aircraft and located at least 3.3 feet from high power transmitting antennas such as VHF
Comm, HF transmitter, DME, Transponder, and Radar. The connection is made by attaching the cable
from the external antenna to the BNC connector on the GDL 50R/52R. The GDL 50/50R/52/52R requires
a UHF antenna that meets the following specifications:
• Standard 50 Ω vertically polarized antenna with a VSWR < 1.7:1 at 978 MHz and < 1.5:1 at
1090 MHz.
• TSO-C66, TSO-C74, or TSO-C112 antennas that also meet the VSWR specification.
3.7.2 GPS/SiriusXM Antenna Installation
This section contains general information as well as installation information for GPS/SXM antennas.
Garmin recommends the antennas shown in
Table 3-6 . However, any equivalent antenna that meets the
specifications listed in Table 3-3 will work with the GDL 5X/5XR GPS external antenna input. Any
equivalent antenna that meets the specifications listed in
Table 3-4 will work with the GDL 5X/5XR
external SiriusXM antenna input.
The GDL 5X can receive GPS position information using the unit's internal antenna or by connecting an
external antenna via the MCX connector. It is recommended to verify the ability of the GDL 5X to receive
GPS information via the internal antenna as GPS reception quality is dependent upon the installation. The
GDL 5X/5XR can receive GPS information with any connected aera or GDU 4XX display.
A GPS antenna is not required to be connected to a GDL 5XR when the unit is connected to a Garmin Aera
660/795/796 or GDU 4XX display. For best performance, mount the GPS, SiriusXM antennas on top of
the aircraft and at least 3.3 feet away from all high power transmitting antennas.
Although no ground plane is required, the antenna typically performs better when a ground plane is used.
The ground plane should be a conductive surface as large as practical, and is typically made of either
aluminum sheet or wire mesh.
Table 3-3 GPS Antenna Minimum Requirements
Characteristics Specifications
Frequency Range 1565 to 1585 MHz
Gain 16 to 25 dB typical, 40 dB max
Noise Figure Less than 4.00 dB
Nominal Output Impedance 50 Ω
Supply Voltage 4.5 to 6.5 VDC
Supply Current up to 60 mA