Chapter 1
TC-201A Overview
About the TC-201A
Final
TC201-A Operation Manual
Release Num. 000
Page 2
December 2019
About the TC-201A
The VIAVI TC-201A Antenna Coupler is used on TCAS and combined TCAS and
transponder directional antennas, to shield the RF signal during testing of the TCAS or
transponder system. The TC-201A supports, when used with the IFR6000, IFR6015 or
APM-424(V)5, maintenance testing in the airborne condition without interfering with air
traffic control or nearby aircraft.
Effects of Multi-path
The TC-201A eliminates errors due to effects of multi-path. TCAS is tested as a coupled
connection through the UUT antenna avoiding multi-path from the ramp, hangar,
buildings and other aircraft, eliminating the need for moving UUT aircraft away from
factors causing multi-path.
TCAS Display Clutter
The TC-201A provides the isolation needed to reduce actual airborne traffic from
responding to TCAS interrogations. Therefore, fewer targets are displayed, allowing the
Ramp Test Set generated target to be easily distinguished.
Features and Capabilities
The TC-201A operates in conjunction with Ramp Test Sets.The TC-201A is compatible
with Phase and Amplitude TCAS systems and combined transponder systems and
features the following:
•
Accommodates both phase and amplitude type antennas
•
Reliable, FAR Part 43, Appendix F, ERP and MTL testing in high multi-path
environments
•
Provides >20 dB of isolation
•
Provides proper shielding for all transponder and ADS-B performance testing
•
Lower antenna adjustable support pole
•
Perform four-quadrant testing by simply rotating the bearing selector dial
•
TCAS bearing accuracy < 10 degrees
