The HP/Agilent 70909A is an RF section module for HP 70000 series modular spectrum analyzers, delivering precise radio frequency signal analysis from 100 Hz to 26.5 GHz. This component extends analyzer capabilities across engineering, research, and industrial measurement applications through diode-pair mixing architecture that reduces conversion loss and enhances sensitivity. A built-in preamplifier in the microwave path further improves receiver performance. For millimeter-wave measurements beyond 26.5 GHz, the module supports external mixer connection—including Agilent 11974 series mixers—with Option Z40 enabling preselected mixing up to 40 GHz. The 70909A integrates into the HP 70000 Modular Measurement System philosophy, providing flexible, expandable RF signal conditioning within a standardized platform.
Technical Specifications
• Frequency range: 100 Hz to 26.5 GHz
• Local oscillator output: 3 to 6.6 GHz
• Intermediate frequency outputs: 21.4 MHz and 321.4 MHz
• Mixing architecture: Diode-pair configuration for reduced conversion loss
• Preamplifier: Integrated in microwave signal path
• External mixer support: Agilent 11974 series; Option Z40 extends capability to 40 GHz with preselected mixing
• Module addressing: Row 6, Column 18 (HP-MSIB bus configuration)
– Key Features
• Diode-pair mixing reduces conversion loss while maintaining sensitivity comparable to fundamental mixer designs
• Microwave preamplifier boosts overall system sensitivity
• Front-panel LO routing enables external mixer connection for extended frequency coverage
• Dual IF output structure (21.4 MHz and 321.4 MHz) supports flexible signal conditioning
• Gain control maintained by host analyzer to preserve constant input-attenuator-to-IF relationship
• HP-MSIB communication interface for modular system integration
– Typical Applications
• Broadband RF and microwave signal analysis
• Millimeter-wave measurements with external mixers (Option Z40)
• Laboratory and field RF characterization
• Research and development signal analysis
– Compatibility & Integration
The 70909A operates within HP 70000 series modular architecture, requiring an LO source such as the HP 70900B and compatible with mainframes including the HP 70001A and displays such as the HP 70004A. Integration with IF sections like the HP 70903A completes measurement system configurations. Module installation requires proper address configuration on the HP-MSIB bus.
