The Marconi IFR Aeroflex 2957D Radio Test System delivers integrated signal generation, modulation analysis, spectrum analysis, and power measurement in a single portable platform. Built for radio manufacturers, service technicians, and communication system operators, this instrument combines benchtop precision with field-deployable capability. The 2957D supports AM, FM, PM, and pulse modulation across its operating range, with dual-tone internal oscillator generation and external modulation input. Spectrum analysis spans 100 Hz to full-span resolution over a 50 dB dynamic range. Audio analysis includes SINAD metering (5–50 dB) and frequency measurement to 500 kHz. RF power measurement handles continuous operation from 0.05 mW to 75 W, with peak ratings to 150 W. P25 trunked radio testing features OSP message programming, ISP decode, and support for Explicit, SCCB, and Adjacent Status Broadcast messaging.
Technical Specifications
• Frequency Range: 10 kHz to 1.2 GHz (2023 model); 10 kHz to 2.4 GHz (2024 model)
• RF Output: +13 dBm (0.1 dB resolution) standard; optional +25 dBm
• AM Modulation: 30 kHz bandwidth (1 dB), depths to 99.9% (0.1% resolution)
• FM Modulation: 100 kHz bandwidth (1 dB), deviation 0–100 kHz, AC/DC coupling
• PM Modulation: 0–10 radians deviation, 10 kHz 3 dB bandwidth
• Pulse Modulation: >40 dB on/off ratio, <10 µs rise time
• Modulation Oscillator: 0.01 Hz to 20 kHz (sine, triangle, square)
• Spectrum Analyzer: 100 Hz to full span, 50 dB dynamic range
• Modulation Analysis: ±1 dB ±1 LSD @ 1 kHz, 12 dB SINAD; 0.1 dB resolution
• RF Power Measurement: 0.05 mW to 75 W continuous; 150 W peak (short intervals)
• SINAD Meter: 5–50 dB range, 0.1 dB resolution
• Audio Frequency Meter: 10 Hz to 500 kHz, 0.1 Hz resolution
– Key Features
• Attenuator hold function prevents RF output dropouts during level control
• Carrier ON/OFF key for safe output disable
• Optional 0–40 kHz audio analyzer
• P25 OSP message programmer and ISP decode
• AES and digital encryption support
– Typical Applications
• Radio device manufacturing and final-stage testing
• Field service and alignment of communication systems
• Trunked radio system commissioning and verification
• Modulation quality and spectral compliance measurement
– Compatibility & Integration
The 2957D accepts external modulation signals and integrates internal tone generation for single- and dual-tone testing protocols.
