A temperature-compensated frequency standard

Abstract

A new approach to the frequency stability requirements of hf single-sideband communication systems is presented. Instead of maintaining the quartz resonator at constant temperature, a compensating network has been developed which will maintain 1 ppm for 6 months over the ambient temperature range of -55 °C to +70°C. Since no power is required for temperature control and no warmup time required, these standards are useful for many hf single-sideband systems. Weighing less than one pound and packaged in a module of 30 cubic inches, it represents a significant advancement in portable, battery-operated frequency control.