Agilent / Keysight 85905A Preamplifier, 45 MHz to 1 GHz, 75 Ohms

The Agilent/Keysight 85905A is a compact 75 Ohm RF preamplifier engineered to enhance measurement sensitivity across the 45 MHz to 1 GHz band. Operating as a dedicated front-end amplifier for the Keysight 8591C Cable TV Analyzer, it delivers 20 dB ± 1.0 dB gain while maintaining a maximum noise figure of 7 dB. The unit improves signal-to-noise ratio, extending dynamic range and measurement accuracy for spectrum analysis and cable TV signal characterization.

– Technical Specifications

• Frequency Range: 45 MHz to 1 GHz
• Impedance: 75 Ohms
• Gain: 20 dB ± 1.0 dB
• Maximum Noise Figure: 7 dB
• Power Source: Host analyzer supplied

– Key Features

• Compact form factor designed for convenient storage in analyzer front cover
• Integrated host-powered operation eliminates external power requirements
• 75 Ohm matching for cable TV and broadband RF applications
• Flat gain response across specified frequency range

– Typical Applications

• Cable TV signal level measurement and analysis
• Low-level RF signal detection in spectrum analysis
• Sensitivity enhancement for broadband measurement systems
• Signal characterization in the VHF to L-band frequency spectrum

– Compatibility & Integration

The 85905A integrates directly with the Keysight 8591C Cable TV Analyzer, drawing power from the host instrument while maintaining mechanical compatibility through front-cover storage. This design approach eliminates external power supplies and simplifies field deployment for in-service cable network measurements.