The Marconi IFR Aeroflex 2946A is a portable communications service monitor that combines signal generation, spectrum analysis, and power measurement in a single field-deployable instrument. Weighing under 12 kg with an integrated side handle, it serves mobile radio, wireless, and avionics testing across 400 kHz to 1.05 GHz. The unit delivers full duplex operation without duplex offset restrictions, enabling simultaneous repeater transmit/receive path qualification and complex modulation testing including ILS, VOR, and marker beacon standards.
Technical Specifications
Signal Generator
• Frequency range: 400 kHz to 1.05 GHz
• Output level: +5 dBm standard, +7 dBm overrange
• Level accuracy: ±2 dB above –127 dBm
• Switching speed: Fast
• AM/FM modulation with ILS SDM 0–90% (glideslope) and 0–50% (localizer) in 0.1% increments
• ILS DDM 0–45% (glideslope) and 0–25% (localizer) in 0.1% steps with 1020 Hz ident
• VOR modulation: 30 Hz tone and sub-carrier phase adjustable 0–360° in 0.1° steps, TO/FROM bearing entry, 1020 Hz ident
• Marker beacon: 95% AM depth at 75 MHz with adjustable 400 Hz, 1.3 kHz, or 3 kHz rates
• Built-in analog cellular: AMPS, TACS, NMT (all country variants)
• Built-in trunking: MPT 1327/1343 and variants
Spectrum Analyzer
• Full-performance analyzer included standard for field and workshop measurements
• Rogue transmission detection capability
Power Meter
• N-Type connector: 5 mW to 150 W
• Antenna port: 0.05 mW to 250 mW
• Accuracy: Better than 10% down to 5 mW (N-Type)
• Direct measurement of low-level and high-power signals without external attenuators
– Key Features
• Full duplex operation with unrestricted duplex offset testing
• Rugged chassis for field and workshop environments
• Portable form factor under 12 kg with side handle
– Typical Applications
• Avionics receiver qualification (ILS, VOR, marker beacon)
• Cellular radio power and modulation testing
• Base station transmit/receive path verification
• Mobile radio field service and troubleshooting
– Compatibility & Integration
Supports AMPS, TACS, NMT, MPT 1327/1343 trunking standards with regional variants.
