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Target Corporation's Interrogator Set UPX-25N is a shipboard interrogator set providing full AIMS MARK XII/SI F capabilities. The set is comprised of the following major assemblies housed in a specially designed rack assembly:
The major assemblies listed above are proven U.S. military equipments currently being used in U.S. and foreign naval shipboard IFF systems. These major assemblies and other related assemblies are housed in a compact, drip proof rack assembly to form Target Corporation's UPX-25N Interrogator Set. The UPX-25N meets stringent U.S. military standards and specifications for temperature, humidity, shock, vibration, and RFI. The drip proof case contains three internal fans which provide equipment cooling by drawing cool air through the lower front screen and exhausting warm air out the top of the equipment rack.
The Target Corporation UPX-25N is capable of interrogating transponder-equipped military or civil aircraft and military ships. Modes 1, 2, 3/A, 4 and C can be challenged on an interlaced basis, with a power level of at least 2kW at 1020 M Hz. The Target Corporation UPX-25N is compatible with externally applied modes of operation. ISLS (Interrogation Side Lobe Suppression) is employed, normally using either the sum-and-omni or sumand-difference approach. Replies are received on 1090 MHz by a receiver with a sensitivity of -84 dBm. Non-synchronous replies, called "fruit", are removed and processed for display.
The UPX-25N can be jumpered to accept mode enables from a decoder or external system in either a multiplexed or unmultiplexed format. Video outputs are available in both a composite and separated format. Mode Ident tags and Reset tags are available on a single line, or may be applied to composite video by the appropriate jumpering.
A large degree of flexibility in installation is provided to permit interface with many shipboard radarsthrough selection of the appropriate rear panel jacks. Installations utilize between five and twelve of these jacks, depending upon complexity.
RECEIVER/TRANSMITTER
External Trigger
5 to 150 volt
0.3 to 20 µsecMode Interrogation
Modes 1, 2, 3/A, 4, C
Modes B and D optionalCoding
Internal: P1, P2 and P3 pulses
External: optionalTransmitter
Frequency 1030 (±0.2) MHz Min Peak RF Power 2000 watts at duty cycles up to 1 .0%
Solid State Transmitter optionalReceiver
Center Frequency: 1090 (±0.5) MHz
3 dB bandwidth: 3.0 MHz
Receiver Gain 112 dB
Noise Figure: 9 dB or less
Switch selectable long and short gain time control gate
GTC Gate 300 to 5000 µsec adjustable
CW and MCW Anti-jamming circuits
Anti Jam "ON" disables GTC Gate Circuits
Video Outputs
Two separated video outputs per mode
Two composite video outputsISLS Trigger
Interrogation side lobe- suppression pulse of 20 to 70
volts amplitude or ISLS switch driver output.
INTERFERENCE BLANKER
Range: From 20 NM selectable to 200 NM.
Input Triggers (SIF Pretrigger)
Mode Sensitive Triggers
Modes 1, 2, 3/A, 4 and C
Mode Identification Tags and Reset Signals
Amplitude: 2-20 volts
Polarity: Positive
Rise time: less than 0.2,µsec
Fall time: less than 0.5 psec
Input Impedance: 75 ohms
PRF: 15 to 3000 PPSInternal Triggering
PRF 300 to 525 PPS, adjustable
INPUT SIGNALS
Composite Video
Tagged Video
Amplitude: Up to 6 volts
Polarity: Positive
Signal to Noise Ratio: Minimum of 2
Rise time: 0.05 to 0.10,µsec
Fall time: 0.05 to 0.20 1lsec
Input Impedance: 75 ohms
OUTPUT TRIGGERS
Mode Identification Tags and Resets
Amplitude: 1.8-18 volts (into 75 ohms)
Polarity: Positive
Rise time: less than 0.2 psec
Fall time: less than 0.5,µsec
OUTPUT SIGNALS
Composite Video
Tagged Video
Amplitude: Adjustable between 1.0 and 5.0 volts (±5%) into 75 ohms
Rise time: 0.05 to 0.1 µsec
Fall time: 0.05 to 0.2 µsec
Drop or Overshoot less than 1 dB
Video Delay 0.7 µsec max.
