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 |
|
|
|
See Also:
Sources:
- Winkler, David F., Searching the Skies: the Legacy of the United States Cold War Defense Radar Program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf
- MIL-HDBK-162A, 15 Dec 1965.
- CDC 30372, Extension Course Institute Air University, Aircraft Control and Warning Tecnician (AFSC 30372) Vol 3, AC&W Equipment, Part II, page 70-122 Available from Google Books.
Links:
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