Discover

Share

Download

Features

/

Article

Frequency control developments

AUG 01, 1966

With understanding of energy trapping, vibration theory is reducing crystal‐filter design to handbook form. Masers and beam tubes too are enjoying developments giving frequency stabilities of one part in

10^{14} .

DOI: 10.1063/1.3048406

Arthur D. Ballato

Robert V. McKnight

CRYSTAL VIBRATORS and atomic frequency standards are continuing to attract the interest of engineers and physicists. In particular, the energy‐trapping concept has assisted in the application of theory to practical quartz resonators. Thus filter crystals have been extended to 125 MHz. Similarly, multiple‐mode resonators of piezoelectric ceramic and quartz can now be made on a single crystal wafer, making possible a filter in a monolithic integrated form. Crystal oscillators, too, have been made, in which the crystal serves both as a control element and as an active device.

More about the Authors

Arthur D. Ballato. Fort Monmouth, New Jersey.

Robert V. McKnight. Fort Monmouth, New Jersey.

© 1966. American Institute of Physics

This Content Appeared In

Volume 19, Number 8

Related content

Features

/

Article

Landing a job in the private sector

Technical knowledge and skills are only some of the considerations that managers have when hiring physical scientists. Soft skills, in particular communication, are also high on the list.

October 17, 2025 11:20 AM

Features

/

Article

A home base for your career

Professional societies can foster a sense of belonging and offer early-career scientists opportunities to give back to their community.

October 16, 2025 10:13 AM

Features

/

Article

The successes and challenges of US–Soviet scientific communication

Research exchanges between US and Soviet scientists during the second half of the 20th century may be instructive for navigating today’s debates on scientific collaboration.

October 01, 2025 12:00 AM

Features

/

Article

Political currents

The Eisenhower administration dismissed the director of the National Bureau of Standards in 1953. Suspecting political interference with the agency’s research, scientists fought back—and won.

October 01, 2025 12:00 AM

Features

/

Article

Reframing the narrative on physics readiness

Alternative undergraduate physics courses expand access to students and address socioeconomic barriers that prevent many of them from entering physics and engineering fields. The courses also help all students develop quantitative skills.

October 01, 2025 12:00 AM

Features

/

Article

Where physics meets poetry

Defying the often-perceived incompatibility between the two subjects, some physicists are using poetry to communicate science and to explore the human side of their work.

September 01, 2025 12:00 AM

Get PT in your inbox

Physics Today - The Week in Physics

The Week in Physics" is likely a reference to the regular updates or summaries of new physics research, such as those found in publications like Physics Today from AIP Publishing or on news aggregators like Phys.org.

Physics Today - Table of Contents

Physics Today - Whitepapers & Webinars