Hewlett Packard 8665B Synthesized Signal Generator for Unit powers on, shows no error codes and completes calibration sequence. Display is only slightly dim (usually these VFD’s are very dim or unusable), fan is clean and quiet. When generating on any frequency, the unit will intermittently drop by 20 or 40dB ish. This is made worse by tapping or gently slapping the unit on the right side and can be temporarily restored by adjusting the attenuator stage through the entire range and back to desired level. AM/FM modulation and internal audio appear to function O.K. No further testing performed. Other issues may be present. This item will require an oversized box and extra packing to avoid possible transit damage. Shipping cost may be high. In person pick up or arrange your own transportation is preferred. As shown.
The HP 8665B is a high-performance synthesized signal generator, designed for RF and microwave testing applications requiring low phase noise, high output power, and precise frequency control. With a frequency range of 0.1 Hz to 4.2 GHz, this signal generator is widely used in communications, radar, electronic warfare (EW), and component testing.
Key Features:
- Frequency Range: 0.1 Hz to 4.2 GHz
- Frequency Resolution: 0.1 Hz steps
- Output Power Range: -140 dBm to +17 dBm (typical)
- Phase Noise: Ultra-low phase noise for precision testing
- Modulation Capabilities:
- AM, FM, and Pulse Modulation
- External and internal modulation sources
- High-accuracy modulation depth and deviation
- Spectral Purity: Low spurious and harmonic distortion
- Output Impedance: 50Ω (Type N connector)
- User Interface: Digital display with soft key navigation
- Remote Control & Automation: GPIB (IEEE-488) interface for automated testing
Applications:
- RF and Microwave Component Testing
- Receiver Sensitivity and Performance Evaluation
- Military and Aerospace Signal Simulation
- Phase Noise Testing
- Radar and Communications System Development
The HP 8665B delivers exceptional signal purity and precision, making it a trusted tool in R&D, production, and maintenance environments where high-stability signal generation is required.









