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Page 1-2 GTX 330 Installation Manual
Revision G 190-00207-02
CAUTION
The GTX 330 lens is coated with a special anti-reflective coating which
is very sensitive to skin oils, waxes and abrasive cleaners. CLEANERS
CONTAINING AMMONIA WILL HARM THE ANTI-REFLECTIVE
COATING. It is very important to clean the lens using a clean, lint free
cloth and an eyeglass lens cleaner that is specified as safe for anti-
reflective coatings.
1.3 TIS System Capabilities
The GTX 330 also provides uplink information such as Traffic Information Service (TIS). TIS is a
ground-based service providing relative location of all ATCRBS Mode A and Mode C transponder
equipped aircraft within a specified service volume. The TIS ground sensor uses real time track reports to
generate traffic notification. TIS provides a graphic display of traffic advisory information in the cockpit
for non-TCAS equipped aircraft.
Advisory traffic information is available to aircraft equipped with a Mode S data link such as the Garmin
GTX 330 transponder. Advisory traffic information may be displayed on a Garmin 400/500 Series unit.
The GTX 330 unit can also be incorporated in installations with other compatible control/display units
such as the Garmin CNX80/GNS 480 and MX20 Multifunction Display (MFD).
Surveillance data includes all transponder equipped aircraft within the coverage volume. Aircraft without
an operating transponder are invisible to TIS. TIS displays traffic within seven nautical miles from 3000
feet below to 3500 feet above the requesting aircraft. The pilot sees the location, relative direction and
altitude of other aircraft.
1.4 Mutual Suppression Pulses
Other equipment on board the aircraft may transmit in the same frequency band as the transponder,
such as DME or another transponder. Mutual suppression is a synchronous pulse that is sent to the
other equipment to suppress transmission of a competing transmitter for the duration of the pulse train
transmission. The transponder transmission may be suppressed by an external source and other
equipment on board may be suppressed by the transponder. This feature is designed to limit mutual
interference.