Mooney M20M, Pilot Operating Handbook

Page: 363 / 377

190-00734-15 Rev. 5 AFMS, Garmin GTX 33X and 3X5 XPDR with ADS-B
Page 4 of 18 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.
GTX 330
or
GTX 330D
Bottom Antenna
GTX 330D
Installs only
GPS
Traffic System
Audio Panel
Optional Interfaces
Heading Source
Secondary GPS
Display
External Ident
Temperature
Squat Switch
External STBY
Required Interfaces
Altitude Source
Power/Ground
Top Antenna
Figure 1 – GTX 330 or GTX 330D Interface Summary