The IFR Aeroflex ATC-1200Y3 is a dual-function test set for transponder and DME system validation in aircraft maintenance and flight-line operations. It performs Mode A and Mode C interrogation, transmitter power measurement, and complete DME ranging and velocity simulation with self-interrogate capability. The instrument generates shaped pulse trains meeting FAA reply requirements and supports TACAN signal simulation via 60 Hz amplitude modulation.
Technical Specifications
Transponder Testing
• Mode A and Mode C interrogation
• On-off ratio: >80 dB
• PRF generator: 50 to 5000 Hz variable
• Sync pulse to P1 leading edge: 2 to 5 µs
• P3 pulse output: nominal amplitude -15 V, width 0.5 to 3 µs
• Gating pulses for diode switch isolation: >80 dB on-off ratio
DME Testing
• Range measurement: -1 to 999.89 nautical miles in 0.01 nm steps
• Velocity measurement: 0 to 9990 knots in 10-knot steps
• On-off ratio: >85 dB
• Echo pulse pair injection at 30 miles from interrogation
• Echo amplitude adjustment: +1 dB to -10 dB relative to reply pulses
• TACAN simulation via 60 Hz modulation: 0 to 50% variable level
• All present and future DME channels supported
Signal Generation
• L-Band leveled generator with crystal control
• Frequency sweep: 950 to 1225 MHz continuous
• VOR paired channels: 108.0 to 139.95 MHz
• Direct frequency selection: 950 to 1225 MHz
• MHz readout in 1 MHz steps (Gz Mode)
• Transmitter frequency measurement via heterodyne method
• Frequency resolution: 500 kHz at 1090 MHz
Calibration Output
• Crystal-controlled calibrator
• Pulse spacing: 1.0 µs or 1.45 µs
• Amplitude: 1 Volt across 51 Ω load
• Phase adjustment for interrogation and reply pulse alignment
– Key Features
• Rapid transmitter frequency setting
• Self-interrogate function for R-NAV testing without external DME
• Suppressor pulse output in XPDR and DME modes
• Digital selection of distance and velocity
• Peak power and transmitter frequency measurement
– Typical Applications
• Bench testing in maintenance facilities
• Ramp testing on operational aircraft
• Transponder compliance verification
• DME system performance validation
• TACAN signal simulation and testing
– Compatibility & Integration
Designed for direct aircraft and test bench integration supporting both Mode A/C transponders and all DME channel configurations.
