Table B-9 - Sxm Satellite Radio Antenna Minimum Requirements - Garmin G3X Touch Maintenance Manual

Table B-9 – SXM Satellite Radio Antenna Minimum Requirements
Characteristics
Frequency Range
Gain
Noise Figure
Nominal Output Impedance
Supply Voltage
Supply Current
Operating Temperature Gain
* - For each 1 dB gain over 24 dB, add 1 dB of attenuation into the antenna cable path between the
antenna and the GDU.
B.9 ADS-B Antenna Interface
The GDL 50R or GDL 52R requires an external monopole or blade-type 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 coax cable from the external antenna to the BNC connector on the
GDL 50R/52R. The GDL 50R/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.
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
2332.5 to 2345 MHz
24 dB*
<1.2 dB
50Ω
3.5 to 5.5 VDC
55 mA
-50° to +85° C
Page B-16
Specifications
190-02472-02
Revision 2