The GTX330 is a panel-mounted Mode S digital transponder with traffic datalink capability that also meets the European mandate for Mode S level 2 surveillance. GTX 330D adds antenna diversity to the features of the GTX 330 for improved visibility of TCAS-equipped aircraft flying above you. GTX 330 features a solid-state design, and with no warm up time, lower power consumption and much lower heat emissions, you’ll enjoy a longer service life.