Accession Number : AD0451638


Title :   DESIGN STUDY OF A TRANSISTOR CRYSTAL OSCILLATOR USING A VOLTAGE-VARIABLE CAPACITOR FOR FREQUENCY MODULATION,


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Fisher, Charles A


Report Date : 05 Aug 1964


Pagination or Media Count : 61


Abstract : This paper presents a design study of a variablefrequency crystal oscillator and reactance modulator for use at 20 to 22 Mc in a VHF transmitter. The oscillator is essentially the transistor equivalent of the Pierce vacuum tube oscillator; however, several unusual design features are involved. In particular, a coil is used in series with the crystal in accordance with the design criteria developed here to allow stable operation over a much wider band of frequencies than is possible with an ordinary crystal oscillator. Also, the design has the output taken from a tank tuned to the second harmonic of the oscillator frequency to minimize frequency-multiplying stages. The reactance modulator employs two silicon voltage-variable capacitors connected across one capacitive branch of the oscillator. This arrangement allows the oscillator frequency to be directly deviated by an audio signal voltage. (Author)


Descriptors :   TRANSISTORS , CRYSTAL OSCILLATORS , TUNED CIRCUITS , VOLTAGE , FREQUENCY MODULATION , VERY HIGH FREQUENCY , HIGH FREQUENCY , MODULATORS , RADIO TRANSMITTERS , COILS , SILICON , VARACTOR DIODES , EQUATIONS , SENSITIVITY , PHASE SHIFT CIRCUITS , STABILITY , SONOBUOYS , BANDWIDTH , ENGINEERING DRAWINGS


Distribution Statement : APPROVED FOR PUBLIC RELEASE