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  2. Automatic Dependent Surveillance–Broadcast - Wikipedia

    en.wikipedia.org/wiki/Automatic_Dependent...

    [2] [3] [4] ADS-B equipment is mandatory for instrument flight rules (IFR) category aircraft in Australian airspace; the United States has required many aircraft (including all commercial passenger carriers and aircraft flying in areas that required a SSR transponder) to be so equipped since January 2020; and, the equipment has been mandatory ...

  3. Transponder (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Transponder_(aeronautics)

    A transponder (short for transmitter-responder [1] and sometimes abbreviated to XPDR, [2] XPNDR, [3] TPDR [4] or TP [5]) is an electronic device that produces a response when it receives a radio-frequency interrogation.

  4. Transponder - Wikipedia

    en.wikipedia.org/wiki/Transponder

    A Highway 407 toll transponder. In telecommunications, a transponder is a device that, ... Some countries have also required, or are moving toward requiring, ...

  5. Illinois ditching I-PASS transponders for sticker tags. Here ...

    www.aol.com/illinois-ditching-pass-transponders...

    The stickers are required to be placed on a vehicle’s windshield – near the rearview mirror. ... There isn't a deadline, but a transponder's battery may die around the time it is marked to expire.

  6. Aviation transponder interrogation modes - Wikipedia

    en.wikipedia.org/wiki/Aviation_transponder...

    This is the type of transponder that is used for TCAS or ACAS II (Airborne Collision Avoidance System) functions, and is required to implement the extended squitter broadcast, one means of participating in ADS-B systems. A TCAS-equipped aircraft must have a Mode S transponder, but not all Mode S transponders include TCAS.

  7. Electronic toll collection - Wikipedia

    en.wikipedia.org/wiki/Electronic_toll_collection

    Many ETC systems use transponders like this one to electronically debit the accounts of registered cars without their stopping. Transponder used in Chile for some expressways ETC Built-in Onboard device in a Nissan Fuga vehicle in Japan Genesis G70 vehicle with South Korea's ETC System Hi-pass Terminal A RFID MTAG used for electronic toll collection on controlled-access highways/motorways ...

  8. Airspace class (United States) - Wikipedia

    en.wikipedia.org/wiki/Airspace_class_(United_States)

    The FAA requirements for Class C airspace status are an operational control tower, a radar-controlled approach system, and a minimum number of IFR approaches conducted per year. The airspace class designation is in effect only during the hours of tower and approach operation at the primary airport; the airspace reverts to Class D if approach ...

  9. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders. The list is retained for historic interest. Pilots are normally required to apply the code, allocated by air traffic control, to that specific flight.