The Varian CPI VZM6993J5 is a high-power traveling wave tube amplifier (TWTA) engineered for ultra-wideband operation across 7.5 to 18.0 GHz. This dual-depressed collector helix TWTA delivers 225 W CW minimum RF output power at the flange, with optional 250 W CW rating. Microprocessor-controlled logic, integrated computer interface, and VSWR soft-fail protection enable reliable operation in demanding RF environments. The amplifier provides 53.5 dB minimum gain at rated power with ±0.25 dB/24 hr gain stability after warmup. Designed for laboratory and field deployment, the unit operates on 220–240 VAC single-phase at 1.4 kVA typical power consumption.
Technical Specifications
• Frequency Range: 7.5 to 18.0 GHz
• Bandwidth: 10.0 GHz
• RF Output Power: 225 W CW minimum at flange (250 W CW optional)
• Gain: 53.5 dB minimum at rated power; 53.5 dB typical small-signal
• Gain Stability: ±0.25 dB/24 hr maximum (post-30 min warmup, constant drive and temperature)
• Gain Variation: 12 dB pk-pk typical across 10.0 GHz bandwidth
• RF Level Adjust: 0 to 20 dB continuous
• Input VSWR: 2.5:1 typical, 1.5:1 maximum (with optional isolator)
• Output VSWR: 2.5:1 maximum
• Load VSWR: 1.5:1 for full compliance; 2.0:1 continuous; any value without damage
• Residual AM: -50 dBc below 10 kHz; frequency-dependent to -85 dBc above 500 kHz
• Phase Noise: Meets IESS 308/309 with 3 dB margin
• Noise and Spurious: -50 dBc typical (excluding harmonics)
• Harmonic Content: -3 dBc typical lower band; -15 dBc typical upper band
• Prime Power: 220–240 VAC, single phase, ±10%, 47–63 Hz
• Power Consumption: 1.4 kVA typical, 1.5 kVA maximum
• Operating Temperature: -10°C to +40°C
• Non-Operating Temperature: -40°C to +70°C
• Relative Humidity: 95% non-condensing
• Operating Altitude: 10,000 ft (3,048 m) with 2°C/1,000 ft de-rating
• Acoustic Noise: 65 dBA maximum at three feet
– Key Features
• Dual-depressed collector helix for efficient operation
• Microprocessor-controlled gain and power management
• VSWR soft-fail protection
• Forced-air cooling with integral blower
• Type N Female input; WRD-750 output connector
• Integrated computer interface for remote control and monitoring
– Interfaces & Connectors
• Input RF: Type N Female
• Output RF: WRD-750
• RF Power Monitors: Type N Female
• Computer Interface: Integrated
