UPX-14

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UPX-14 Long Range Interrogator-Responder IFF/SIF Set - A Long-Range Interrogator-Responder IFF/SIF set built by ?????. The UPX-14 transmits IFF/SIF interrogations and receives replies from aircraft within the host radar's range. The UPX-14 requires a master external encoder and a separate decoder for each operating position/data processor. Typical of the encoder/decoder equipment used in a manual system is the GPA-122 which allows up to 14 decoder units or one for each radar scope. In the SAGE System, the FST-2 Coordinate Data Transmitter supplies the encoder and decoder functions to the UPX-14.

It is possible with the UPX-14 to process information about friendly aircraft (SIF) and to determine if an aircraft is friendly (IFF). SIF information is obtained by interrogating friendly aircraft with a set of two pulses, the space between them determines which of the 4 modes is used. IFF (Identification Friend or Foe}) also known as Mode 4 transmits the two pulses and a classified (a/o 1958) encrypted code train of pulses providing identity information.

UPX-14 Interrogator-Responder IFF/SIF
Mode Int Spacing Reply Codes Users Uses Notes
1 3 us 32 Mil 2-digit 5-bit mission code, cockpit selectable
2 5 us 4096 Mil 4-digit octal unit code set on ground for fighters
can be changed in flight by transport aircraft
3A 8 us 4096 Mil/Civ 4-digit octal id code for the aircraft, set in the cockpit
assigned by the air traffic controller
3C 21 us 1278 Mil/Civ Altitude from aircraft altimeter
4 Encrypted
Challenge
3-pulse reply Mil Encrypted ID info

UPX-14 Interrogator-Responder IFF/SIF

Element Value Notes
Nomenclature UPX-14
Origins UPX-6
Variants
Manufacturer
Type SIF/IFF Interrogator-Responder
Technology Tube
IEEE Band UHF
Transmit Frequency 1030 MHz
Receive Frequency 1090 MHz
PRF Host radar determined
Range Host radar determined Long
Power 117 V, single phase
50, 60, 400 Cycles
Coder/Decoder External
UPX-14 Controls.

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