View source for UPX-14

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'''{{PAGENAME}} 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.

{| class="wikitable" width="800px"
|+ UPX-14 Interrogator-Responder IFF/SIF
|- 
! Mode
! Int Spacing
! Reply Codes
! Users
! Uses
! Notes
|-
| align="center"| 1 || 3 us || 32 || Mil ||  2-digit 5-bit mission code, '''cockpit selectable''' ||
|-
| align="center"| 2 || 5 us || 4096 || Mil || 4-digit octal unit code '''set on ground for fighters'''<br>can be changed in flight by transport aircraft ||
|-
| align="center"| 3A || 8 us || 4096 || Mil/Civ||  4-digit octal id code for the aircraft, set in the cockpit<br>assigned by the '''air traffic controller''' ||
|-
| align="center"| 3C || 21 us || 1278 || Mil/Civ || Altitude from '''aircraft altimeter''' || 
|-
| align="center"| 4 ||  Encrypted<br>Challenge|| 3-pulse reply || Mil || Encrypted ID info||
|}
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|colspan="2"|[[Image:.jpg|795px|thumb|center|UPX-14 Interrogator-Responder IFF/SIF]]
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== UPX-14 Interrogator-Responder IFF/SIF ==
{| width="800px"
|- valign="top"
| width="50%" |
{| class="wikitable" width="400px"
|- 
! Element
! Value
! Notes
|- valign="top" 
| 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<br>50, 60, 400 Cycles|| 
|-
| Coder/Decoder || External ||

|}
| width="50%" |
[[File:UPX-14 Controls.jpeg|thumb|left|350px|UPX-14 Controls.]]
|}
<!--[[File:UPX-14 System.png|thumb|center|800px|FPS-3 System Components]]-->
<!--{{UPX-14Components}}-->
----
'''See Also:'''
* [[:Category:IFF/SIF/Beacon Sets|US IFF/SIF Sets]]

'''Sources:''' 
* {{Winkler}}
* MIL-HDBK-162A, 15 Dec 1965.
* [https://books.googleusercontent.com/books/content?req=AKW5QacEaVbAsPu5mghafOvcv5padoSVsCg6iVHS7vUzrP6OmCo9GPnY3yHd2mvNTtzwiqyUAEDD8diypFKpe2RrxIU3L_ibSfdp8hrx_g4je9Jc41Q64agwZAeMRRlDpN-66Agzk2WiTR54uL16AzKHPhF6OZoMenbjQzu_0DUdKy0rQKHch6SsoJ0sUJjfzPMNWHBw0mO_YhpOV5PlcP7nhvRBTXTEiN8X9mSLlC2dtwx5guRBpkDEm7Phxu0KM1qXKlkr4D2Xfj-plkrpHN1WNaeTbt_CCA 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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[[Category:IFF/SIF/Beacon Sets]]
[[Category:UPX-14]]