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FEATURES
*Complies with U.S. National Standard for the IFF MARK X (SIF) Air Traffic Control Radar Beacon System (ATCRBS) characteristics
Where air traffic is heavy and a large number of ground interrogators are necessary, there are a considerable number of transponder replies. These replies are triggered by all interrogators that are within transmission range. The responses are received at a recurrence frequency, which in all probability, is different from that of the desired replies. These undesired replies are referred to as "fruit."
Defruiting techniques employ delay lines, storage tubes, or digital storage to remove the non-synchronous replies on a pulse-to-pulse basis. Digital storage is employed by Target Corporation's blanker.
Target Corporation's blanker is capable of operating without modification or special triggering devices, with any associated IFF indicators and radar, including those that feature MTI, Video Integrators, Pre-Jittering, and various other techniques requiring close control of the PRF. The Blanker employs metal-oxide-silicon (MOS), integrated-circuit, static-shift registers as the memory elements and accepts any mode sequence of Modes 1, 2, and 3/A. The Blanker is designed for future expansion to provide the capability of Modes B, C, D, and 4 aspects of the IFF MARK XII (SIF) system by the addition of circuit cards and/or components. Video signals on Modes 1, 2, and 3/A (as well as expansion Modes B, C, D, and 4) are stored and compared with signals received in the next range period of each mode respectively. The range of the equipment is adjustable from 20-300 NM in 20-mile increments.
Automatic-noise thresholding and pulse-width discrimination are provided to improve the system signal to noise ratio. A standby mode enables extensive testing of the unit while bypassing the video to avoid interrupting the PPI Display presentation.
Slide-out chassis, plug-in circuit cards, and a modular power supply enable convenient servicing. Front panel connectors are provided for injecting test signals and also for monitoring of input and output signals.
PERFORMANCE
1 . Selectable defruiting range in increments of 20 NM from 20 NM to 300 (±5%) NM.
2. Uniform "ACCEPT GATE" width independent of range over entire defruiting range.
3. Has "RECIRCULATE" feature for compatibility with aircraft aerial switching.
4. Processing of signals to within 20 mV of noise.
5. Automatic noise threshold is capable of handling GTC or non-GTC video outputs from interrogator.
6. Input pulse width discriminator and restorer of 250 (+25, -0) nanosec. Prevents memory from overloading in presence of a noisy environment.
7. Output pulse width discriminator and restorer of 300 (+30, -0) nanosec. Provides optimum acceptance gate efficiency and prevents output noise pulses from overloading subsequent processing equipment.
8. Maximum standby-defruit video delay of 700 nanosec.
9. Operating temperature range of 0° to 50°C.
INPUT REQUIREMENTS
Power:
60 watts max
Voltage:
110 ±10% VAC or 220 -±10% VAC; 45 to 400 Hz.
Triggers:
SIF Trigger
Parameters:
Amplitude : 2-20 volts
Polarity : Positive
Risetime : less than 0.2 µsec
Palltime : less than 0.2 µsec
Input Impedance : 75 ohms
Signal:
Tagged video
Parameters:
Amplitude : up to 6 volts
Polarity : Positive
Signal-to-Noise Ratio : Minimum of 2
Risetime: -0.05 to 0.10 µsec
Falltime : 0.05 to 0.20 µsec
Input Impedance : 75 ohms
OUTPUTS
Signal:
Tagged video
Parameters:
Amplitude: Adjustable between 0.0 and 5.0 volts (-±5%)
into 75 ohms
Duration : Input -±30 ns
Risetime : 0. 05 to 0.1 µsec
Falltime : 0.05 to 0.2 µsec
Droop or overshoot : less than 1 dB
Video Delay : 0. 7 µsec max
Temperature:
0° to 50°C
Weight:
17 lbs
Dimensions:
18 inches deep
19 inches wide
5 inches high
Shipping Weight:
43 lbs
Dimensions:
22 inches deep
22.75 inches wide
11 inches high
