The Marconi IFR Aeroflex 2955 is a 1 GHz radio communication test set integrating RF signal generation, analysis, and audio measurement into a single instrument. It delivers comprehensive testing for AM, FM, and phase modulation transceivers across laboratory and field environments. The unit generates signals from 0.4 MHz to 1 GHz with 50 Hz resolution up to 530 MHz and 100 Hz resolution to 1 GHz, while simultaneously measuring RF power, frequency, and modulation characteristics.
Technical Specifications
RF signal generation spans 0.4 MHz to 1 GHz with output levels from -140 dBm to -20 dBm (N-type) or -120 dBm to 0 dBm (BNC), accurate to ±2 dB across 0 to +50°C. AM modulation reaches 70% up to 400 MHz carrier. FM deviation operates 0 to 25 kHz. Phase modulation deviation extends 0 to 10 radians with modulation frequencies from 1 Hz to 50 kHz (300 Hz to 3.4 kHz for phase modes). Output resolution is 0.1 dBm.
RF measurement and analysis cover 1.5 MHz to 1 GHz. Power measurement handles 0.05 mW to 75 W continuous, with 150 W short-duration capability and 50 W reverse power protection. Residual FM measures better than 13 Hz rms to 520 MHz (typically 10 Hz) and less than 26 Hz to 1000 MHz (typically 20 Hz). Residual AM is less than 0.5%. Harmonics stay below -20 dBc to 1.5 MHz, -25 dBc to 250 MHz, and -20 dBc to 1000 MHz. Phase noise measures less than -110 dBc/Hz to 500 MHz and -104 dBc/Hz to 1000 MHz at 20 kHz offset. Spurious signals remain better than -45 dBc to 110 MHz and -35 dBc above 110 MHz for carriers to 88 MHz, or less than -60 dBc for carriers to 960 MHz.
Audio generation spans 50 Hz to 15 kHz with outputs from 1 mV to 2.55 V up to 5 kHz and 1 mV to 2 V to 15 kHz. Waveforms include sine, square, triangle, and sawtooth.
– Key Features
• Automatic frequency tuning and leveling
• Independent tuning for duplex system measurement
• RF leakage less than 0.2 µV in 50 Ω load at 25 mm distance
• Visual and audible alarm protection
• 0.1 dBm output resolution
– Typical Applications
Field and laboratory service of AM/FM/ΦM transceivers; duplex radio alignment; modulation quality verification; RF power measurement and analysis.
