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3-11190-11110-00 Rev. G
Garmin GDL 39 Portable ADS-B and GPS Receiver User’s Guide
3.2.2 External ADS-B Blade Antenna (Optional)
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.
Figure 3-8 External ADS-B Antenna