Garmin GTS 855 - Manual (Page 6)

2 Garmin GTS 8XX Series Traffic Advisory System 190-00587-02 Rev. A
pRoDuCT DEsCRIpTIoN
The GTS 8XX Series Traffic Advisory System (TAS) and Traffic Collision
Avoidance System (TCAS I) uses active interrogations of Mode A/C/S transponders
to provide Traffic Advisories to the pilot independent of the air traffic control
system. The system also uses passive surveillance by means of an Automatic
Dependent Surveillance – Broadcast (ADS-B) receiver which is enabled when
installed with an ADS-B link transmit class of equipment.
Figure 1 GTS 8XX LRU
The GTS 8XX Series of Traffic Advisory System (TAS) or Traffic Alert and
Collision Avoidance System (TCAS I) microprocessor-based sub-systems products
consist of the GTS 800, GTS 820 and GTS 850. The GTS 800 TAS product consists
of one LRU which has low power (40 Watts) transmit capability, and one GA 58,
or other Garmin-approved, directional antenna. The GTS 820 TAS and GTS 850
TCAS I products include one LRU paired with one GPA 65 PA/LNA Amplifier
Module, which allows high power (250W) transmit capability, and one GA 58 or
other Garmin-approved directional antenna. An optional second antenna may also
be installed with these systems. The optional second bottom mounted antenna
may be omnidirectional or a Garmin approved directional antenna.
For targets equipped with a 1090 MHz ADS-B transmit class of equipment, the
GTS 8XX series combines active (interrogated) and passive (ADS-B) surveillance
data to enhance the accuracy of target position on the display. The systems use
Garmin’s CLEAR CAS
TM technology to correlate ADS-B and actively interrogated
targets to provide pilots with the most accurate target position. Passive ADS-B
surveillance is enabled when the GTS 8XX is installed with an ADS-B transmit
class of equipment.