DESCRIPTION
The Ultra Electronics Herley MD400C-2 Radar Transponder is a general purpose augmentation device used to enhance the tracking capability of C-band radars. Utilizable primarily for range tracking and safety functions, the MD400C-2 is suitable for use on both manned and unmanned vehicles. The transponder is applicable to aircraft, missiles, space launch vehicles, sounding rockets, and drone targets, both sea and airborne.
The design of the MD400C-2 utilizes the latest in modern devices and circuitry. It is all solid-state, except for the magnetron, to provide a reliable product with extremely long operating life.
FEATURES
• 400 Watt minimum peak power output
• Long life magnetron transmitter
• Sensitive superheterodyne receiver
• Small, less than 43 cubic inches (705 cubic cms)
• Lightweight, less than 43 ounces (1220 grams)
• Tunable over 5.4 to 5.9 GHz
• Adjustable internal delay
• Reverse polarity power lead protection
• Single and double pulse interrogations
• Adjustable code spacing
• Built-in duplexer for single antenna operation and protection from high antenna reflections.
ELECTRICAL
• Frequency Range: 5.4 to 5.9 GHz
• Frequency Separation: 50 MHz minimum
• Impedance, Input/Output: 50 ohms nominal
• Reverse Polarity Protection: Built-in series diode protection against damage from DC input power reversal
• Voltage Transient Protection: Internal voltage protection for transients from 50 microseconds to 0.5 seconds per MIL-STD-704
• Short and Open Circuit Protection: Built-in to provide antenna mismatch protection
• Input Voltage: 22 to 34 VDC, isolated from chassis ground
• Quiescent Current: 0.5 Amps nominal (0.65 Amps max)
• Input Current: 1.5 Amps maximum up to 2600 pps
• Recovery Time: 50 µsecs maximum
• Blanking: Built-in circuitry prevents reply during recovery time
PHYSICAL
• Size: 5.0 x 4.65 x 2.5 inches (12.7 x 11.81 x 6.35 cms)
• Volume: 43 cubic inches (705 cubic cms) nominal displacement
• Weight: 43 ounces (1220 gms)
• Duplexer: Built-in circulator, 4-port ferrite
• Test Points: Internal test points are provided for alignment
• Antenna Connector: TNC Female
• Power Connector: MS3113H8-4P (mates with PT06 E-8-4S)
• Pin Connections: A, +28v; B and D 28V return; C, unused
• Sealed Chassis: Gasket seal for low pressure use
RECEIVER
• Design: Superheterodyne
• Sensitivity: -70 dBm minimum
• Frequency Tuning: One local oscillator and three preselector controls externally accessible upon removal of seal screws
• Tuning Range: 5.4 to 5.9 GHz
• Sensitivity Bandwidth: ±2 MHz (maintains -70 dBm)
• Dynamic Range: +20 to -70 dBm
• Bandwidth (3dB): 11 ±3 MHz
• Image Rejection: 60 dB minimum
• Pulse Decoder: Single or double, internally selectable
• Pulse Width: 0.25 to 5.0 µsecs. single; 0.25 to 0.5 µsecs double
• Pulse Rise Time: 0.1 µsec maximum, single or double
• Double Pulse Coding: Spacing adjustable between 3.0 and 12.0 µsecs
• Second Pulse Spacing: Accepts
±0.15 µsecs. Rejects ±0.3 µsecs
• Random Triggering: 10 pps maximum averaged over 10 minute intervals
TRANSMITTER
• Power Output: 400 Watts peak min.
• Output Device: Magnetron
• Frequency Tuning: Single control externally accessible upon removal of seal screw
• Tuning Range: 5.4 to 5.9 GHz
• Frequency Stability: ±3.0 MHz under all operating conditions
• Pulse Width: 0.5 ±0.1 µsec
• Pulse Width Jitter: 0.01 µsec. max.
• Pulse Rise/Fall Time: 0.1/0.2 µsec. maximum (10 to 90%)
• Spectrum: The reply pulse RF spectrum bandwidth (in MHz) will not exceed 3.0/pulse width (in µsecs) measured at the 1/4 power level points
• PRF: 2600 pps minimum
• Reply Delay: Adjustable from 1.5 to 6.0 µsec
• Delay Variation: 0.03 µsec maximum for input signal levels between 0 and -65 dBm
• Interrogation Replies: 99% minimum input signal levels between +20 and -70 dBm
• Over-Interrogation Protection: Limiting above 2600 pps
ENVIRONMENTAL
• The transponder meets the requirements of MIL-STD-810
• Vibration Sine: Up to 25.9 g’s
• Vibration Random: 18.8 grms, 225 seconds/axis
• Temperature, Operating: -40°F (-40°C) to +167°F (+75°C)
• Temperature, Storage: -80°F(-62.2°C) to +185°F(+85°C) for 3 days
• Shock: 1100g (0.5 milliseconds) 1/2 sine any axis
• Altitude: 760 mm (sea level) to 0.04 mm of mercury (320,000 feet altitude)
Humidity: Any, up to 100% including condensation due to temperature changes
• Acceleration: 50g applied along any axis for 5 minutes
• RFI/EMI: MIL-STD-461E
• Pressurization: Maintain 20 PSI ±1 pound for 8 hours
PRODUCT NUMBERS
• P/N 500002-23
• P/N 500002-25 – EWR127-1 Compliant
• P/N 500002-27 – Standard unit
• P/N 500002-28 – Ruggedized to withstand 35g sine vibration and 100 g Acceleration
• P/N 500002-29 – Code spacing selection switch on front panel
• P/N 500002-31 – Transient overvoltage surge protection