The Varian CPI VZC-6962-D6A4 is a C-Band high-power amplifier tube designed for satellite communications uplink, radar systems, scientific instrumentation, and industrial heating applications. This klystron power amplifier delivers 3.0–3.35 kW maximum tube output (64.77–65.44 dBm) across the 5.850–6.425 GHz frequency range with 45 MHz instantaneous bandwidth. The device achieves 77 dB minimum gain with exceptional stability: ±0.25 dB/24 hr. temporal drift and ±1 dB thermal variation across 20–40°C operation. Input and output VSWR are held to 1.25 and 1.30 maximum respectively, supporting 2.0:1 load VSWR for full specification compliance.
Technical Specifications
• Frequency Range: 5.850–6.425 GHz
• Output Power: 3.0–3.35 kW (64.77–65.44 dBm) tube; 2.6–2.9 kW (64.15–64.62 dBm) at flange
• Instantaneous Bandwidth: 45 MHz (80 MHz option available)
• Gain (Rated Power): 77 dB minimum
• Gain Stability (Time): ±0.25 dB/24 hr. max.
• Gain Stability (Temperature): 1 dB max. (20–40°C); ±2.5 dB max. (0–50°C)
• Input/Output VSWR: 1.25 / 1.30 maximum
• Residual AM: −50 dBc (20–400 Hz); −60 dBc (400 Hz–2 kHz); −80 dBc (2–500 kHz)
• AM/PM Conversion: 4°/dB maximum
• Intermodulation: −29 dBc (two equal carriers)
• Power Consumption: 2.5 kVA typical (saturated output); 2.8 kVA maximum
• Heat Dissipation: 9000 W typical
• Power Factor: 0.95 minimum
– Key Features
• Power adjustability from 0 to −20 dB with ±0.1 dB typical resolution
• Phase noise exceeds INTELSAT IESS-308/309 by −10 dB at −10 dB backoff
• Gain slope 0.04 dB/MHz maximum over center frequency ±13 MHz
• Group delay specifications: 0.25 ns/MHz linear, 0.05 ns/MHz² parabolic, 2.0 ns pk-pk ripple (80 MHz option)
• AC current harmonics less than 20% (primarily fifth and seventh orders)
– Typical Applications
• Satellite communications uplink amplification
• Radar transmission systems
• Scientific instrumentation
• Industrial heating systems
– Compatibility & Integration
CPI heritage product from Varian Associates’ former Electron Device Business. UPS source selection should account for harmonic content.
