User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 1−47
15 Dec 2005
H. RCZ−852 Diversity Mode S Transponder
The RCZ−852 Diversity Mode S Transponder is an airborne transponder designed to
perform both conventional and advanced air traffic control (ATC) functions. It receives
coded radar signals from ATC ground stations and other aircraft and transmits coded
replies. The replies contain information such as aircraft identity, altitude, and data
communication messages.
The transponder works with the air traffic control radar beacon system (ATCRBS) and
mode select (Mode S) system to provide enhanced surveillance and communications
capability required for air traffic control system automation and onboard collision
avoidance systems. It has antenna diversity and is defined as a Class 3A transponder
with TCAS interface capability. The RCZ−852 Diversity Mode S Transponder has the
capabilities that follow:
• Surveillance functions of both ATCRBS and Mode S ground sensors
• Surveillance functions of airborne interrogators
• Bi−directional air−to−air information exchanges, COMM−U/V
• Ground−to−Air data uplink, COMM−A
• Air−to−Ground data downlink, COMM−B
• Multisite message protocol
• Ground−to−Air extended length message (ELM), COMM−C.
The transponder does not support COMM−D extended length message (ELM)
communication.
Figure 1−17 shows a graphical view of the RCZ−852 Diversity Mode S Transponder and
Table 1−12 gives items and specifications that are particular to the transponder.
Figure 1−17. RCZ−852 Diversity Mode S Transponder