The Marconi IFR Aeroflex 2955B is a 1 GHz radio communication test set that consolidates signal generation, RF analysis, power measurement, and audio signal generation into a single portable instrument. Designed for field and benchtop deployment, it supports AM, FM, and PM modulation across frequencies from 0.4 MHz to 1 GHz, with a menu-driven CRT interface for efficient operation.
Technical Specifications
RF Signal Generator
• Frequency range: 0.4 MHz to 1 GHz (usable to 1060 MHz)
• Output level: −140 dBm to −20 dBm (N-type), −120 dBm to 0 dBm (BNC)
• Output resolution: 0.1 dBm
• Output accuracy: ±2 dB (5 dBm to −127 dBm range, 0 to +50°C)
• Modulation types: AM, FM, PM
• Modulation deviation: 0 to 25 kHz
• Phase noise: <−110 dBc/Hz at 20 kHz offset (to 500 MHz), <−104 dBc/Hz (to 1000 MHz)
• Harmonics: <−20 dBc to 1.5 MHz, −25 dBc to 250 MHz, −20 dBc to 1000 MHz
• Sub-harmonics: None to 530 MHz, −45 dBc to 110 MHz (carriers ≤88 MHz), <−60 dBc (carriers to 960 MHz)
• Residual FM: <13 Hz rms to 520 MHz, <26 Hz to 1000 MHz
• Residual AM: <0.5%
RF Analyzer
• Measurement range: 1.5 MHz to 1 GHz
• Power meter range: 0.05 mW to 75 W continuous
• Max input power: 30/75 W (N-type), 0.5 W (BNC)
• Frequency meter: 400 kHz to 500 MHz usable, 50 Hz resolution to 530 MHz, 100 Hz to 1000 MHz
• Frequency accuracy: ±1 digit
Modulation Meter
• FM sensitivity: 1 V p-p for 5 kHz deviation (±10% at 1 kHz)
• PM sensitivity: 1 V p-p for 5 rads (±12% at 1 kHz)
• Modulation frequency range: 1 Hz to 50 kHz
• Auto-tunes to incoming signal
Audio Signal Generator
• Two independent AF generators
• Waveforms: Sine, square, triangular, sawtooth
• Frequency range: 10 Hz to 20 kHz
• Frequency resolution: 0.1 Hz (10 Hz to 3.25 kHz), 1 Hz (3.25 kHz to 20 kHz)
• Frequency accuracy: ±0.01 Hz (10 Hz to 100 Hz), ±0.1 Hz (100 Hz to 20 kHz)
– Key Features
• N-type and BNC connectors for flexible integration
• Auto-ranging scales for power measurement
• Reverse power protection (50 W trip, auto-reset)
• CW mode operational 15 to 400 MHz, usable 400 kHz to 500 MHz
• Digital and analog frequency display
– Typical Applications
• Radio communication equipment testing and servicing
• AM/FM/PM transceiver validation
• Field and production test environments
• Modulation and spectral analysis
– Compatibility & Integration
Standard N-type and BNC RF connectors support direct integration with most radio communication devices and test fixtures.
