The Kalmus LA500V is a Class A linear RF power amplifier engineered for critical test, measurement, and communication systems demanding exceptional linearity and stability. This dual-cabinet system delivers 500 W forward power with ±0.5 dB automatic level control and unconditional stability across all load conditions, including infinite VSWR. Modular construction with removable sub-assemblies enables field maintenance while premium components ensure reliable operation in demanding environments.
## Technical Specifications
**Electrical Performance**
• Class of Operation: Class A linear
• Gain Flatness: ±2.0 dB unleveled; ±0.5 dB leveled
• Automatic Level Control: ±0.5 dB for 10 dB input change
• Harmonics: -13 dBc minimum
• Spurious Outputs: -70 dBc (V) minimum, -90 dBc (VM) minimum
• Duty Cycle: 100%
• Primary Power Required: 95 to 265 VAC, 47–63 Hz, 2.0 kVA maximum
**RF Characteristics**
• Input/Output Impedance: 50 Ohms
• VSWR Tolerance: Withstands infinite VSWR without shutdown
• Connectors: Type-N female
• Front Panel Meter: Dual-scale analog (0–500 W forward/reflected power)
## Key Features
• Unconditionally stable across all terminations
• Over-temperature and VSWR protection with status indicators
• Operating temperature range: -10 to 40 °C
• Forced-air cooling via tube-axial fans
• Formed aluminum construction with clear, chemically treated cabinet covers
## Remote Control & Integration
25-pin D-subminiature connector provides remote control of RF gain, ALC, reflected power set point, AC line and RF control, meter selection, ALC speed, and VSWR reset. Optional IEEE 488.2/RS232 interface module available for system integration.
## Physical Configuration
Two 19-inch rack-mount cabinets: Amplifier module (83″ H × 19″ W × 21.5″ D, 74 lb) and Power Supply/Control module (53″ H × 19″ W × 17.5″ D, 36 lb).
