Varian CPI VZU6991K1

The Varian CPI VZU6991K1 is a high-power vacuum electronic device engineered for microwave frequency amplification in demanding applications. Built on Communications & Power Industries’ heritage from the former Varian Electron Device Business, this klystron or traveling wave tube (TWT) delivers high-gain amplification and reliable performance across radar, satellite communications, scientific instrumentation, and test platforms.

– Technical Specifications

• Device Type: Vacuum electronic amplifier (klystron or TWT)
• Frequency Range: Operation across microwave and millimeter-wave bands; related models span 8–18 GHz, 12.4–18 GHz, and extended bands to 700 GHz
• Output Power: Varies by configuration; TWT models rated 20 W to 100 W; klystron variants from 1200 W to 7.5 MW peak
• Gain: 35–36.5 dB typical for TWT amplifiers
• Bandwidth: Instantaneous bandwidths of 75–85 MHz for Ku-Band models; TWTs cover octave-plus ranges (e.g., 8–18 GHz)
• Noise Figure: 35 dB max (L-Band and above)
• Harmonic Content: −3 dBc to −15 dBc across frequency band
• Residual AM: −40 dBc
• Residual FM: <4 kHz peak-to-peak
• AM/PM Conversion: ~2.5 °/dB
• Beam Voltage/Current: Tens to hundreds of kV and tens to hundreds of amps (model-dependent)

– Key Features

• High-gain linear amplification across wide instantaneous bandwidths
• Extended frequency coverage including millimeter-wave bands
• Low noise and harmonic distortion
• Coaxial input interface (N-type connector)
• Waveguide output coupling (CPR flange)

– Typical Applications

• Radar transmit chains and system integration
• Satellite uplink and bent-pipe transponder amplification
• Particle accelerator RF systems
• Electron paramagnetic resonance (EPR) and electron spin resonance (ESR) spectroscopy
• Dynamic nuclear polarization (DNP) instrumentation
• Millimeter-wave radar and sensing systems

– Compatibility & Integration

RF input termination via standard N-type coaxial connector. RF output interfaces to waveguide systems via CPR flange coupling, enabling direct integration into transmission networks and antenna feed systems.