The Marconi IFR Aeroflex 2975 is a Project 25 (P25) radio test set that consolidates the functionality of over 20 discrete instruments into a single platform. It delivers parametric and protocol testing capabilities for P25 radios and systems, including Common Air Interface analysis across AM/FM and P25 modulation schemes. The instrument operates across 250 kHz to 2.7 GHz and supports both field and laboratory deployments.
Technical Specifications
RF and Signal Analysis
• Frequency range: 250 kHz to 2.7 GHz
• Spectrum analyzer: Digitized 2.7 GHz with Click and Tune mode
• Generator output: +10 dBm to -110 dBm
• Receiver sensitivity (T/R port): -30 dBm to -137 dBm
• Port protection: 10 W (+40 dBm) for 30 seconds on Generator port
• Harmonic spurious: -25 dBc maximum above 50 MHz
• Residual FM: < 15 Hz rms (post-detection BW 300 Hz to 3 kHz)
Modulation and Analysis
• Supported modes: C4FM, AM, FM, CQPSK
• C4FM modulation fidelity meter with frequency error and symbol-time deviation reporting
• CQPSK EVM option for transmitter alignment
• Dual-channel digital storage oscilloscope with amplitude and frequency markers
Encryption and Data
• AES encryption option
• DES OFB Type III encryption/decryption
• Encryption key management option via KVL-3000+ using P25 key management protocol
• IMBE vocoder and data encryption tests
• Full TIA/EIA-102 test patterns
• Enhanced channel logging for OSP, ISP, and LCO messages
Audio Analysis
• Audio analyzer: 0–40 kHz option
• User-selectable audio filters
• Tone signaling and tone remote functions
• Frequency, power factor, frequency error, SINAD, distortion, voltage, and AF level metering
– Key Features
• Integrated 20+ instrument functions in single chassis
• RS-232, GPIB, and Ethernet remote control
• TCP/IP Ethernet interface with IP addressability
• Virtual instrumentation via internet connection
• TCL programmable control
• PS-2 keyboard and mouse operation
• Parallel printer port and video monitor connectivity
– Typical Applications
• P25 radio system commissioning and field service
• Transmitter and receiver alignment verification
• Protocol compliance testing
• Encryption key validation and management
• Audio quality and SINAD measurements
• Control channel and conventional message analysis
– Compatibility & Integration
The 2975 operates as a networked instrument supporting remote monitoring and automated testing via Ethernet. TCL scripts enable custom test automation and integration with external systems.
