Amplifier Research 100S1G4

The Amplifier Research 100S1G4 is a self-contained, air-cooled solid-state power amplifier engineered for broadband applications demanding high gain, linearity, and instantaneous bandwidth. Operating across 0.8 GHz to 4.2 GHz, this amplifier delivers a minimum 100 W CW output with nominal 120 W at 3 dB compression. Push-pull circuitry in high-power stages reduces distortion and enhances stability across the operating range.

Technical Specifications

• Output Power: Minimum 100 W CW; nominal 120 W at 3 dB compression; minimum 90 W at 3 dB compression; nominal 100 W at 1 dB compression; minimum 70 W at 1 dB compression


• Gain: Minimum 50 dB with 15 dB minimum continuous adjustment range


• Input for Rated Output: 1.0 mW maximum


• Harmonic Distortion: −20 dBc maximum at 80 W


• Flatness: ±1.5 dB typical; ±2.0 dB maximum; ±1 dB with internal leveling


• Spurious Signals: −73 dBc typical


• Phase Linearity: ±1 deg/100 MHz typical


• Input/Output Impedance: 50 Ω nominal; input VSWR 2.0:1 maximum


• Primary Power: 90–132 VAC or 180–264 VAC, 50/60 Hz, single phase (auto-selected); 340 W maximum consumption


• Modulation: AM, FM, Pulse

Key Features

• Digital control panel with local and remote operation via IEEE-488 (GPIB) and RS-232


• Forward and reflected power display with internal RF detector


• Internal/external automatic level control (ALC) with front panel adjustment


• Pulse input capability with RF output level protection


• Keylock prevents unauthorized mode switching


• Type N female RF connectors

Typical Applications Broadband RF testing, EMC compliance, wireless communication system validation, and signal generation across L- to C-band frequencies.

Compatibility & Integration The 100S1G4 integrates into automated test systems via GPIB and RS-232 interfaces. Forced-air cooling and portable form factor (50.3 cm × 47.0 cm × 61.0 cm; 86.2 kg) suit laboratory benches and field deployments.