Piezo-Electric Crystal-Controlled Transmitters

A discussion of piezo-electric crystals and the early history of the development of the art has been given. The development of crystal-controlled vacuum tube oscillators by the Naval Research Laboratory has been outlined and various means of amplifying the output of a crystal-controlled oscillator are cited and the best method is described. This method consists of balancing or neutralizing the various stages of amplification and also observing proper precautions tor reducing grid circuit losses by using high values of biasing voltage. A complete high-power low-frequency crystal controlled transmitter is described and a schematic wiring diagram of circuits employing in this transmitter is shown. Schematic wiring diagram and illustrations of one type of low-power high-frequency transmitter complete the subject matter covered in this paper.