User Manual

Table Of Contents
system components 523-0 809018
2.11. TSA-4100 34-54-00.
The sections that follow describe the external theory and general data of the directional Trafc Surveillan ce Antenna (TSA) in the
Trafc Surveillance System.
2.11.1. T
rafc Surveillance Antenna, External Theory of Operation.
Refer to Figure 2-18 for a simplied block diagram that includes this antenna. The TSA-4100 Antenna acts both as an omni and a
directional antenna at 1030 MHz & 1090 MHz at +/- 3 MHz for the Trafc Surveillance System. It has four passive antenna elements
for directionality and is mounted on the outside of the aircraft fuselage. The upper antenna must be the TS A-4100 direction a l antenna.
The lower antenna can be another TSA-4100 directional antenna or it can be an omnidirectional antenna. The return loss for each
connector is less than or equal to -12.5 dB. Meeting the MOPS requirements for TSO-C112 and TSO-C119b, the antenna is vertically
polarized. The TSA-4100 meets all li ghtning protection requirements for Zone 1A on an aluminum ground plane.
2.12. A
NTENNA, TSA-4100, DATA.
The TSA is Mode S directional antenna. The number 1 TSA is mounted on the top of the aircraft. The optional number 2 TSA
is mounted on the bottom of the aircraft. For the TCAS functio n of the TSS, the TSA is directional, which allows the system to
compute bearing to a target ai rcraft. For the transponder function of the TSS, the TSA acts as an omnidirectional antenna.
2.12.1. T
SA-4100 Illustration.
Refer to Figure 2-14 for an illustration of the TSA-4100.
Figure 2-14. TSA-4100, Short and Long Connectors
2.12.2. T
SA-4100 Outline and Mounting Diagram.
NOTE
There are two versions of connectors on the TSA. One version of TSA has longer connectors, the other version
has shorter connectors. Refer to Figure 2-15 for connector lengths.
Refer to Figure 2-15 for outline and mounting diagrams of th e TSA-4100 with long connectors. Refer to F igure 2-16 for outline an d
mounting diagrams of the TSA-4100 with short connectors.
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