Marconi IFR Aeroflex ATC-1400 Transponder/DME Test Set

The Marconi IFR Aeroflex ATC-1400 is a microprocessor-based test set for comprehensive testing and troubleshooting of Air Traffic Control transponder and Distance Measuring Equipment avionics. Operate via front panel controls or remotely through IEEE-488-1978 GPIB for Automatic Test Equipment integration. With optional accessory units (T-1401, S-1403DL, SI-1404), the system extends to TACAN, Mode 4 IFF, and Mode S transponder testing.

– Technical Specifications

Signal Generation
• Frequency range: 952.01 MHz to 1222.99 MHz
• Frequency accuracy: ±0.001%
• Display resolution: 10 kHz
• Frequency variation (∆F): ±9.99 MHz in 0.01 MHz or 10 kHz increments
• Channel selection: 962 to 1213 MHz in 1 MHz steps
• RF output level: 0 to −127 dBm into 50 Ω, adjustable in 1 dB increments
• RF output level accuracy: ±2.0 dB (0 to −90 dBm), ±2.5 dB (−90 to −110 dBm)
• Variable SLS and echo pulse level control

Suppressor Pulse Output
• Pulse width: 33 µs (±3 µs)
• Amplitude: 3 to 27 V adjustable
• Front panel on/off control and level adjustment

DME Mode
• Range: 0 to 399.99 NM in 0.01 NM increments
• Range accuracy: ±0.02 NM plus ±0.005% of selected range
• Range delay: −1 NM switch selectable for indicator calibration
• Velocity: Inbound/outbound selectable, maximum range settable to 100, 200, or 400 NM
• Velocity range: 0 to 9990 KTS with deceleration to 0 KTS then acceleration logic
• Acceleration: 0 to 3990 KTS or 9990 KTS with velocity decrement-to-zero logic
• Squitter: Digitally implemented with stable rate and distribution
• DME serial data: Input and output available
• Pulse filtering: Gaussian-shaped with side lobe shaping for adjacent channel rejection

– Key Features

• Manual or remote control via GPIB for ATE integration
• Stable digital squitter generation with repeatability
• Independent velocity and acceleration profiles for dynamic range simulation
• Filtered DME pulse generation for accurate adjacent channel testing

– Typical Applications

• ATC transponder maintenance and repair
• DME system certification and troubleshooting
• Avionics bench testing
• Automated test system integration

– Compatibility & Integration

• IEEE-488-1978 GPIB interface standard
• Optional accessory compatibility for TACAN, Mode 4 IFF, and Mode S testing