A ruggedized RF power amplifier for use in the 200 MC telemetry band

This paper discusses the design considerations Involved in the development of a ruggedized 50-watt rf power amplifier, tunable over the frequency band of 215 to 245 megacycles. The amplification is accomplished in one stage, using an Eimac ceramic tetrode. The unit is capable of operating under severe airborne environmental conditions. Several novel features are incorporated in the amplifier design to match the circuitry to the ceramic tetrode. These features include a tuned input tank composed of two transmission lines, and a tuned transmission-line output tank that has been curved to conserve space. The unit is blower cooled and requires approximately 100 cubic inches of housing volume in its present configuration.