Frequency Control by Low Power Factor Line Circuits

This paper points out the advantages of concentric conductor lines as low power factor or high Q resonant circuits for controlling the frequency of very high frequency oscillators. The electrical characteristics of lines of various dimensions at various frequencies is given. Several forms of temperature compensated lines are described. Oscillator circuits, circuit combinations, and precautions for obtaining stable transmitter frequencies are suggested. Photographs of typical line controlled transmitters are included. The results obtained with line control indicate that the method has great potential usefulness comparable with the usefulness of piezoelectric crystal control.