Surveillance for Busy Airspace
IFR-certified 250 W transponder
Optional 1090 MHz ES broadcast technology
Easy-to-read LCD display
Traffic Information System (TIS-A) alerts on compatible displays
Pressure altitude, dedicated VFR squawk button and more
A panel-mounted Mode S digital transponder series with traffic datalink capability and dedicated pushbutton keys for squawk code selection, the GTX 330 family brings ATC aircraft surveillance to new levels of precision, reliability and performance.

Leading the Way to ADS-B with Optional ES Upgrade
Optionally available with available ES, or Extended Squitter, technology the GTX 330 takes the lead in providing an affordable pathway to ADS-B compliance for the Next Generation airspace system. Using precise GPS-referenced positioning information, the extended squitter technology enables transponders to automatically transmit more accurate, and more useful, traffic surveillance data ? including aircraft flight ID, position, altitude, velocity, climb/descent, and heading information. (Compared to traditional Mode S and Mode C transponders, which can only broadcast altitude, and thus require ground-based radar to correlate and identify the aircraft's position.)

Traffic in Simulcast
Certified to TSO-C166b authorization for 1090 MHz extended squitter transmission, the ES upgrade improves upon the existing transponder query system while working seamlessly with existing ATC protocols. The ADS-B reports provide ground controllers with considerably faster updates than traditional radar. And by simultaneously broadcasting this information to TAS or TCAS equipped aircraft, it enables them to essentially see the same traffic picture for their location that ATC is watching on the ground. Thus, with everyone in the ADS-B loop watching and reacting to the same flight trajectories, safe separation is far easier to maintain.

Quality Shows Through
All the features of the standard GTX 330 transponder are retained in the ES version: Solid-state design, 250-watt transmitter, remote ident and auto standby, altitude monitor with voice alerts, TIS-A traffic interface, and an easy-to-read LCD display that reverses its numbers out of black for optimal viewing in all lighting conditions. A dedicated VFR squawk code button makes entering the numbers quick and easy. And a variety of useful timing and display functions include flight time, count-up and count-down timers, plus current pressure altitude. The GTX 330 can also be used to satisfy the European mandate for Mode S level 2 surveillance. And an antenna diversity option is added with the GTX 330D for improved air-to-air surveillance of TCAS-equipped aircraft flying above you.

Physical & Performance
Physical dimensions 6.25"W x 1.65"H x 11.25"D (15.9 x 4.2 x 28.6 cm)
Display type digital
Weight 4.2 lb (1.9 kg)
Voltage range 11-33
Transmit power 250 watts nominal
Panel-mounted
Transponder type mode A/C and S
Squawk code selection push-button
Traffic Information Services (TIS) alerts compatible
Transponder Features
Solid state transmitter (more efficient, longer life)
Verbal alerts
Outside air temperature display
Pressure altitude readout
Altitude monitor function
Density altitude readout
Built-in timers
Automatic ALT/GND mode