Fast Electronic Tuning of High Power Circuits for UHF Power Amplifier.

摘要

A technique was developed for fast tuning (one microsecond) a coaxial cavity power amplifier to utilize the several advantages of narrowband power over an octave frequency range at UHF. The method described incorporates PIN diodes and is similar to that previously developed for VHF power output systems. Power output and frequency range objectives were not achieved due to the choice of a conventional pi-network output circuit. An improved output circuit is proposed in order to meet design goals for power output and frequency range. This fast-tuning technique, applied to a multiplexer-power combiner, is suggested as a method of overcoming the three decibels of power loss usually associated with the use of binary wideband hybrid combiners for multi-tone operation. (Author)