Garmin International Inc 01869 Manual De Usuario

3-6

Garmin GDL 39 Portable ADS-B and GPS Receiver User’s Guide

190-11110-00  Rev. A

A blade-type ADS-B antenna is mounted on the exterior of the aircraft. 

Connection is made by unscrewing the antenna on the GDL 39 and attaching 
the cable from the external antenna to the female SMA connector on the top 
of the GDL 39. The GDL 39 requires a UHF antenna that meets the following 
specifications: 

• Standard 50 ohm 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. 

 NOTE:  Certain types of transponder antennas that utilize very thin radiator 

elements are only intended for use at 1030 and 1090 MHz. These types of 
antennas should be evaluated on a model-by-model basis to determine 
their suitability as UAT data link antennas. 

The following table includes a list of compatible antennas. 

DME 

Transponder

BNC

Comant

CI-100

DME 

Transponder

TNC

Comant

CI-100-2

DME 

Transponder

BNC

Comant

CI-105

DME 

Transponder

BNC

Comant

CI-105-3

DME 

Transponder

BNC

Comant

CI-105-11

DME 

Transponder

BNC

Comant

CI-105-16

DME 

Transponder

C

Comant

CI-110-40-30

DME 

Transponder

C

Comant

CI-110-41-30

DME 

Transponder

C

Comant

CI-110-60-30

DME 

Transponder

C

Comant

CI-110-61-30