HP-Agilent-Keysight 70621A Preamplifier, 100 kHz to 2.9 GHz

The HP-Agilent-Keysight 70621A is a low-noise preamplifier module for RF and microwave spectrum analysis systems. Operating from 100 kHz to 2.9 GHz, it integrates into HP 70000 Series mainframes as a 1/8-width module to enhance system sensitivity and reduce noise figure in front-end measurement configurations. The preamplifier delivers high-gain amplification for detection of low-level signals and includes a front-panel +28 V dc output for noise-source drive voltage. Built-in bypass switches allow preamplifier engagement or disengagement without removing the module.

Technical Specifications

Frequency Range: 100 kHz to 2.9 GHz

Noise Source Drive Voltage: +28 V dc output (front panel)

Module Configuration: 1/8-width for HP 70000 Series mainframes

Key Features

Low-noise, high-gain amplification stage for sensitivity enhancement

Reduces system noise figure for improved signal detection at threshold levels

Enables noise figure measurements when paired with spectrum analyzer systems

Integrated bypass capability via front-panel switches

Modular plug-in design with no external connections required

Typical Applications

RF spectrum analysis requiring enhanced sensitivity

Low-level signal detection in microwave measurement systems

Noise figure characterization in receiver chains

System noise performance optimization in 100 kHz to 2.9 GHz band

Compatibility & Integration The 70621A requires HP 70900 Local Oscillator firmware version 900314 or later. It operates within the HP 70000 Series modular architecture and coordinates with HP 70600A or HP 70601A preselectors to manage input overload conditions and multiple responses. An upgrade kit may be supplied with specific configurations to meet firmware requirements.