Instrumentation TWT Amplifier The 1177H01 Instrumentation TWT Amplifier is a laboratory instrument designed for general purpose microwave applications. It offers a minimum gain of 30 dB, maximum noise figure of 35 dB, minimum spurious modulation of -35 dB, and a maximum VSWR of 3.0:1. RF impedance is 50-ohms. Call for available connector configurations. Front-panel provides an easy-to-read Helix Current meter. Frequency Range: 2 to 4GHz Power Output: 10 watts