Showing papers on "Crystal oven published in 1966"
01 Feb 1966
TL;DR: In this article, progress made in the field of quartz crystal units and quartz crystal controlled oscillators over the past few years is reviewed in general, but several accomplishments which are thought to be of special importance, are discussed in detail.
Abstract: The paper discusses progress made in the field of quartz crystal units and quartz crystal controlled oscillators over the past few years The field is reviewed in general, but several accomplishments which are thought to be of special importance, are discussed in detail These subjects include, among others, quartz vibrator characteristics and enclosures, modes of motion including the "trapped energy" concept and long-term drift (aging) of crystal units The characteristics of various types of oscillators are reviewed including temperature compensated and high precision types, and the problem of short-term stability of crystal controlled oscillators is discussed Precision oscillators are available today with a daily drift rate as low as a few parts in 1011and a short time stability better than a few parts in 1010for a time period of one millisecond
40 citations
TL;DR: An improved 5 MHz reference oscillator for use in time and frequency standards has been developed in this article, using an improved crystal unit, reaching a long term drift rate of less than 1×10-11 per day in a few days.
Abstract: An improved 5 MHz reference oscillator for use in time and frequency standards has been developed. This oscillator, using an improved crystal unit, reaches a long term drift rate of less than 1×10-11 per day in a few days. The design includes precautions for reduction of effects of conducted electrical noise on the output frequency. Modular design of functional circuits provides ease of manufacture and uniformity of the product. Stabilized temperature control circuits have been utilized to provide improved oven performance. The oscillator has been tested for the effects on frequency and phase stability of power supply variation, changes in thermal environment, modulation by electrical noise, and mechanical vibration. Phase noise within the range of 100 Hz through 5.0 kHz varies from -120 dB to -125 dB.
13 citations
01 Dec 1966
3 citations
2 citations
01 Dec 1966
TL;DR: In this article, the authors describe frequency stability performance versus time on several types of moderate and precision quartz crystal oscillators over a period of several years and compare these oscillators with the USAECOM Primary Frequency Standard.
Abstract: : The report describes frequency stability performance versus time on several types of moderate and precision quartz crystal oscillators over a period of several years. Many of the oscillators are older units intended for use in a controlled environment with no restrictions on size and power consumption; present-day standards used in modern Army equipment are also represented. All of the oscillators evaluated in this report were compared with the USAECOM Primary Frequency Standard. A description of the instrumentation used to obtain the frequency stability data is given and its accuracy is discussed. A specially performed test of starting and stopping two crystal oscillators is included and their warmup characteristics and ability to return to the original frequency are described. (Author)
1 citations
TL;DR: In this paper, a solid-state zero-field maser oscillator has been experimentally investigated to determine the power, stability, and spectral purity which may be expected in this type of device.
Abstract: A solid-state zero-field maser oscillator has been experimentally investigated to determine the power, stability, and spectral purity which may be expected in this type of device. The maser operates in a zero-field configuration and uses the ferric ion substituted as an impurity in an aluminum nitrate host crystal. Single-crystal and powder samples were used in the experiments, and a comparison between the sample configuration is given.