HP / Agilent 70900B Local Oscillator

The HP/Agilent 70900B Local Oscillator serves as both the synthesized local oscillator and master control module for the HP 70000 Modular Measurement System. This module directly determines system performance across frequency accuracy, phase noise, and tuning speed—critical parameters for spectrum analyzers, surveillance receivers, and lightwave signal analyzers.

– Technical Specifications

Local Oscillator Output
• Frequency range: 3.0 GHz to 6.6 GHz
• Output power: +7 to +15 dBm
• Output impedance: 50 Ω nominal
• Phase noise: -108 dBc/Hz at 10 kHz offset from carrier
• Frequency synthesis resolution: millihertz

Reference & Calibrator Outputs
• 300 MHz output: 0 dBm ±1 dBm, 50 Ω nominal impedance
• 100 MHz input: 0 dBm ±3 dB, 50 Ω nominal impedance
• Calibrator output at 300 MHz: -10 dBm ±0.3 dBm, 50 Ω nominal impedance
• Calibrator frequency accuracy: 300 MHz × frequency reference error

Control & Trigger Interfaces
• External trigger input: TTL positive edge, 2 TTL loads
• HSWP line type: TTL open collector
• HSWP maximum delay: 200 µs from high to sweep initiation
• HSWP maximum current draw: 16 mA
• Sweep voltage range: 0 to 1 V

– Key Features

• Master control module dictates system features and manages slave module operations
• Fast tuning speed directly enables rapid analyzer response for surveillance applications
• Command processing and GPIB speed management for automated testing workflows
• Downloadable program support
• Limit line capabilities for component testing and digital radio mask verification
• Extensive marker functionality for signal analysis

– Typical Applications

• Spectrum analysis and frequency measurement
• Surveillance receiver systems requiring fast tuning
• Automated test and measurement automation
• Lightwave signal analysis

– Compatibility & Integration

The 70900B integrates as a core module within the HP 70000 Modular Measurement System architecture, providing synthesis control and system-level command management across all connected measurement modules.