Agilent / Keysight 8665A High-Performance Signal Generator, 4.2 GHz

The Agilent/Keysight 8665A is a synthesized signal generator delivering precise RF signal generation from 100 kHz to 4.2 GHz. Built for R&D, manufacturing, and laboratory environments, it combines broad frequency coverage with advanced modulation flexibility and exceptional phase noise performance. Though no longer manufactured by Keysight, the 8665A remains in service across demanding metrology and receiver testing applications.

– Technical Specifications

Frequency Range
• 100 kHz to 4.2 GHz
• 0.01 Hz frequency resolution

Output Power
• −140 dBm to +13 dBm
• Leveled RF output at +13 dBm

Modulation Capabilities
• AM, FM, and PM
• FM rates to 2 MHz with deviations to 20 MHz
• AM range: 0% to 100%
• Optional pulse modulation (Option 008): pulse width and delay adjustment 50 ns to 999 ns; rise/fall times 80 dB

Phase Noise & Spurious
• SSB phase noise < −140 dBc/Hz typical at 20 kHz offset at 1 GHz (with Option 004)
• Nonharmonic spurious < −100 dBc to 2 GHz

Reference & Stability
• Internal 10 MHz reference oscillator
• Option 001: high-stability time base with Electronic Frequency Control (EFC)

– Key Features

• Frequency sweep capability
• Internal modulation source
• 50 Ohm impedance output
• HP-IP (IEEE-488) interface for instrument control and data acquisition
• Configurable rear panel I/O (Option 003)
• Low-noise enhancement for out-of-channel receiver testing and clock applications (Option 004)
• Selectable rack configurations: flange kits with or without handles; front handle kit available

– Typical Applications

Receiver sensitivity and selectivity characterization; clock source applications requiring low phase jitter; RF component testing and validation; modulation index and deviation verification; swept frequency measurements.

– Compatibility & Integration

The 8665A is obsolete and no longer supported by Keysight. Replacement parts and service support are available through third-party test equipment suppliers. Operating and calibration documentation is obtainable from secondary sources.