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2. Air traffic control radar beacon system - Wikipedia

   en.wikipedia.org/wiki/Air_traffic_control_radar...

   Mode 4 is used by military aircraft for the Identification Friend or Foe (IFF) system. Mode S is a discrete selective interrogation, rather than a general broadcast, that facilitates TCAS for civilian aircraft. Mode S transponders ignore interrogations not addressed with their unique identity code, reducing channel congestion.

3. Aviation transponder interrogation modes - Wikipedia

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

   Mode S transponders are compatible with Mode A and Mode C Secondary Surveillance Radar (SSR) systems. [2] 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.

4. Identification friend or foe - Wikipedia

   en.wikipedia.org/wiki/Identification_friend_or_foe

   The basic concepts from Mode S were then militarized as Mode 5, which is simply a cryptographically encoded version of the Mode S data. The IFF of World War II and Soviet military systems (1946 to 1991) used coded radar signals (called cross-band interrogation, or CBI) to automatically trigger the aircraft's transponder in an aircraft ...

5. Avidyne Corporation - Wikipedia

   en.wikipedia.org/wiki/Avidyne_Corporation

   Entegra & Entegra Release 9 Integrated Flight Deck Systems; IFD550 FMS/GPS/NAV/COM; IFD540 FMS/GPS/NAV/COM [11] IFD440 FMS/GPS/NAV/COM; AMX240 Audio Panel; AXP340 Mode S Transponder w/ADS-B OUT; AXP322 Mode S Remote Transponder w/ADS-B OUT; EX600 MultiFunction Display (MFD) SkyTrax100 ADS-B IN Receiver; TWX670 Color Tactical Lightning Detection ...

6. Portable collision avoidance system - Wikipedia

   en.wikipedia.org/wiki/Portable_collision...

   The transponder on any aircraft within range of the interrogation replies on 1090 MHz with their squawk code (known as mode A) and altitude code (or mode C). Mode S transponders also reply on this frequency, and encoded within the mode S transmission is the mode A (squawk) and mode C (altitude) information.

7. List of military electronics of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_military...

   Combined interrogator & transponder system: BAE Systems: AN/APX-118: Identification Friend or Foe (IFF) system: P-3 Orion: AN/APX-119: Identification Friend or Foe (IFF) system: F-15 Eagle, F-15E Strike Eagle: Raytheon: AN/APX-125: Combined interrogator & transponder system: BAE Systems: AN/APX-126: Combined interrogator & transponder system ...

8. Transponder - Wikipedia

   en.wikipedia.org/wiki/Transponder

   Another mode called Mode S (Mode Select) is designed to help avoiding over-interrogation of the transponder (having many radars in busy areas) and to allow automatic collision avoidance. Mode S transponders are backward compatible with Modes A and C. Mode S is mandatory in controlled airspace in many countries.

9. Traffic collision avoidance system - Wikipedia

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

   The mode S transponder is fully operational. TCAS will operate normally and issue the appropriate interrogations and perform all tracking functions. However, TCAS will only issue traffic advisories (TA), and the resolution advisories (RA) will be inhibited. Automatic (traffic/resolution advisories) The mode S transponder is fully operational.