Showing papers on "Crystal oven published in 1970"
Patent•
28 May 1970
TL;DR: In this article, a crystal oscillator is phase controlled by means of a feedback loop containing a tuned crystal discriminator which supplies a corrective signal to a variable capacitance diode in series with the oscillator crystal.
Abstract: A crystal oscillator is phase controlled by means of a feedback loop containing a tuned crystal discriminator which supplies a corrective signal to a variable capacitance diode in series with the oscillator crystal.
14 citations
TL;DR: A large number of auxiliary lines may be generated in the frequency spectrum of an acousto-electric oscillator, if a small r.f. field of a frequency close to the fundamental frequency of the oscillator cavity is superposed on the d.c. field as mentioned in this paper.
11 citations
TL;DR: In this paper, the automatic measurement of the frequency of c.w. microwave semiconductor oscillators using a frequency coincidence technique is described, which does not require skilled readjustments for use at any center frequency within a microwave frequency band.
Abstract: A description is given of the automatic measurement of the frequency of c.w. microwave semiconductor oscillators using a frequency coincidence technique. The equipment is simple to use and does not require skilled readjustments for use at any centre frequency within a microwave frequency band. A description is also given of the application of the equipment to the measurement of some frequency modulation properties.
6 citations
Patent•
03 Nov 1970
TL;DR: In this article, a satellite is used to control the environment of a crystal oscillator for the purpose of attaining extreme frequency stability and reducing the problems of preflight testing and adjusting.
Abstract: Structure and apparatus located on a satellite which control the environment of a crystal oscillator for the purpose of attaining extreme frequency stability and reducing the problems of preflight testing and adjusting. The oscillator is located in an evacuated chamber together with heat shields and ovens.
3 citations
Patent•
27 May 1970TL;DR: In this article, the frequency of a square wave transistor multivibrator oscillator is determined by a high-gain AC coupled quartz crystal feedback loop, which is provided by a DC coupled RC network feedback path which provides only sufficient gain to barely sustain oscillations.
Abstract: The frequency of a square wave transistor multivibrator oscillator is determined by a high-gain AC coupled quartz crystal feedback loop. Oscillator startup is provided by a DC coupled RC network feedback path which provides only sufficient gain to barely sustain oscillations. When power is turned on, the firststage transistor is slowly biased through its linear region. The RC network thus provides a sinusoidal wave until energy at the resonant frequency of the crystal is produced, whereupon the crystal feedback path, which dominates, ''''takes over'''' and the multivibrator frequency becomes solely dependent upon the crystal.
2 citations
01 Aug 1970
TL;DR: In this paper, Capparelli and Verrazzani presented new techniques for building a variable frequency crystal oscillator based on the use of a negative inductor or capacitor, where the interval available for the frequency deviation is larger than the one existing between the natural frequencies f p and f s of the crystal.
Abstract: This letter refers to one by Capparelli and Verrazzani [1]. Its aim is to present new techniques for building a variable frequency crystal oscillator based on the use of a negative inductor or capacitor. The interval available for the frequency deviation is larger than the one existing between the natural frequencies f p and f s of the crystal. The spurious frequencies uncontrolled by the crystal are absent.
1 citations