The Marconi IFR Aeroflex 3515N is a portable radio communications test set engineered for field service and laboratory deployment. It delivers over-the-air testing of analog (AM/FM) and digital (P25, EPLRS, SADL) transceivers without component disconnection. Operating from 2 MHz to 1 GHz with usability extended to 2 GHz for amplitude modulation, the instrument combines transmitter and receiver test capabilities with antenna/cable analysis and modulation generation in a single field-portable platform.
Technical Specifications
Frequency Coverage
• Operating range: 2 MHz to 1 GHz
• Usable to 2 GHz for AM applications
• Warm-up time: 3 to 5 minutes
• Operating temperature: -20°C to +50°C / +55°C
Transmitter Testing
• RF power measurement: 0 to 20 W direct; 0 to 200 W with external attenuator
• RF frequency error measurement
• AM modulation and FM deviation analysis
• RSSI measurement
• Duplex test screen for simultaneous transmit/receive verification
Receiver Testing
• Distortion and SINAD/sensitivity measurement
• Over-the-air receiver signal strength measurement
• Dual audio generators with 150 Hz squelch tone capability
Signal Generation
• RF signal generator with modulation oscillator (0.01 Hz to 20 kHz)
• AM modulation: 0 to 99.9% with 0.1% resolution
• FM deviation: 0 to 100 kHz, 1 dB bandwidth 100 kHz
• Phase modulation: 0 to 10 radians, 3 dB bandwidth to 10 kHz
• FSK support: 2-level and 4-level from external logic signals
• Waveform outputs: sine, triangular, square
Antenna and Cable Analysis
• VSWR and return loss measurement
• Cable loss and distance-to-fault measurement
• Cable fault location to several centimeters
Audio Testing
• Audio frequency counter and TalkTest functionality
• H-250 SINCGARS handset adapter support
• Optional oscilloscope for audio signal analysis
Optional Spectrum Analyzer
• Displayed average noise level: -120 dBm (10 kHz span typical)
• -136 dBm with pre-amp enabled
– Key Features
• Weight under 8.5 pounds
• Battery-operated for extended field deployments
• MIL-PRF-28800F Class II environmental rating
• Digital radio support without encryption/COMSEC restrictions
• Integrated SINAD/distortion, modulation, and RF power metering
– Typical Applications
• Field service and maintenance of military and commercial radio systems
• P25, EPLRS, and SADL transceiver verification
• AM/FM analog radio testing and troubleshooting
• Cable and antenna system validation
• Receiver sensitivity and distortion baseline establishment
– Compatibility & Integration
Supports H-250 SINCGARS handset connections. Optional spectrum analyzer module available for signal monitoring applications.
