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  1. T - AT&T Inc.

    Yahoo Finance

    18.28-0.02 (-0.11%)

    at Thu, Jun 6, 2024, 4:00PM EDT - U.S. markets closed

    After Hours 18.30 +0.01 (+0.08%)

    Nasdaq Real Time Price

    • Open 18.29
    • High 18.45
    • Low 18.22
    • Prev. Close 18.30
    • 52 Wk. High 18.45
    • 52 Wk. Low 13.43
    • P/E 9.83
    • Mkt. Cap 131.07B
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  3. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    0041–0057. Belgium. Assigned for VFR traffic under Flight Information Services (BXL FIC). [citation needed] 0100. Australia. Flights operating at aerodromes (in lieu of codes 1200, 2000 or 3000 when assigned by ATC or noted in the Enroute Supplement). [6] 0100–0400.

  4. Transponder - Wikipedia

    en.wikipedia.org/wiki/Transponder

    In air navigation or radio frequency identification, a flight transponder is an automated transceiver in an aircraft that emits a coded identifying signal in response to an interrogating received signal. In a communications satellite, a satellite transponder receives signals over a range of uplink frequencies, usually from a satellite ground ...

  5. Aviation transponder interrogation modes - Wikipedia

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

    The aviation transponder interrogation modes are the standard formats of pulsed sequences from an interrogating Secondary Surveillance Radar (SSR) or similar Automatic Dependent Surveillance-Broadcast (ADS-B) system. The reply format is usually referred to as a "code" from a transponder, which is used to determine detailed information from a ...

  6. Equipment codes - Wikipedia

    en.wikipedia.org/wiki/Equipment_codes

    Equipment codes. An equipment code describes the communication (COM), navigation (NAV), approach aids and surveillance transponder equipment on board an aircraft. These alphabetic codes are used on FAA and ICAO flight plan forms to aid Flight service station (FSS) personnel in their handling of aircraft. On the FAA domestic flight plan form ...

  7. Transponder (aeronautics) - Wikipedia

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

    A transponder (short for trans mitter-res ponder [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. Aircraft have transponders to assist in identifying them on air traffic control radar. Collision avoidance systems have been ...

  8. I-Pass - Wikipedia

    en.wikipedia.org/wiki/I-Pass

    I-Pass. I-Pass (stylized as I-PASS) is the electronic toll collection system utilized by the Illinois State Toll Highway Authority (ISTHA) on its toll highways that launched on November 18, 1993, with the opening of Interstate 355 (Veterans Memorial Tollway). [1] It uses the same transponder as the E-ZPass system used in the Northeastern US ...

  9. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  10. Identification friend or foe - Wikipedia

    en.wikipedia.org/wiki/Identification_friend_or_foe

    Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1]

  11. Traffic collision avoidance system - Wikipedia

    en.wikipedia.org/wiki/Traffic_collision...

    A traffic alert and collision avoidance system ( TCAS, pronounced / tiːkæs /; TEE-kas ), is an aircraft collision avoidance system designed to reduce the incidence of mid-air collision (MAC) between aircraft. It monitors the airspace around an aircraft for other aircraft equipped with a corresponding active transponder, independent of air ...

  12. Electronic toll collection - Wikipedia

    en.wikipedia.org/wiki/Electronic_toll_collection

    E-ZPasstollbooths, like this one on the Pennsylvania Turnpikein Bensalem Township, Pennsylvania, use transponders to bill motorists. Electronic toll collection(ETC) is a wireless system to automatically collect the usage fee or tollcharged to vehicles using toll roads, HOV lanes, toll bridges, and toll tunnels.[1] It is a faster alternative ...