190-00734-15 Rev. 3 AFMS, Garmin GTX 33X and 3X5 XPDR with ADS-B
Page 4 of 17 FAA APPROVED
Section 1. GENERAL
1.1 GTX 33X
The Garmin GTX 33X family consists of the GTX 330 ES and GTX 33 ES (Non-
Diversity Mode S Transponders) and the GTX 330D ES and GTX 33D ES
(Diversity Mode S Transponders). The ES option of any of the transponders
provides ADS-B extended squitter functionality.
All Garmin GTX 33X transponders are a radio transmitter/receiver that operates on
radar frequencies, receiving ground radar or TCAS interrogations at 1030 MHz and
transmitting a coded response of pulses to ground-based radar on a frequency of
1090 MHz. Each unit is equipped with IDENT capability to initiate the SPI (special
position identification) pulse for 18 seconds and will reply to ATCRBS Mode A,
Mode C and Mode S All-Call interrogation. Interfaces to the GTX 33X are shown
in the following block diagrams.
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