The VIAVI TC‑201 Antenna Coupler is designed for TCAS and combined TCAS/transponder directional antennas, providing RF shielding during system testing. Used with the AVX‑10K, IFR6000, IFR6015, or APM‑424(V)5, it enables maintenance testing in an airborne condition while minimizing interference with air traffic control and nearby aircraft. The coupler supports both phase and amplitude antenna types, offers more than 20 dB of isolation, and ensures reliable testing in high multipath environments. It also shields transponder and ADS‑B performance measurements for accurate, compliant maintenance procedures.

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