A:
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PRO: Although UAT is the newest of the ADS-B technologies, it was also the first certified ADS-B surveillance tool within the NAS (2001). It is the only ADS-B technology that is bidirectional and therefore supports ADS-B "IN" functions such as aircraft-to-aircraft collision avoidance services and real-time weather and flight information services (FIS) for the pilot. Because of the greater efficiency of the UAT payload, it can also support a larger number of simultaneous users in the same bandwidth. UAT is the current small aircraft standard in the U.S. and is also being used in China, Japan and South Korea. Equipment is now being manufactured in Europe.
CON: : At the moment, it is the least profitable technology for manufactures. UAT requires a dedicated transceiver in each aircraft, while 1090ES only requires software modification to existing Mode-S transponders.
NOTE: Many experts feel that UAT will eventually become the international standard for ADS-B because it is more robust, is bidirectional, and has more room for expansion.
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