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Accurate Clock Pendulums$
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Accurate Clock Pendulums

Robert J. Matthys

Print publication date: 2004

Print ISBN-13: 9780198529712

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198529712.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 07 March 2021

Check your clock against WWV

Check your clock against WWV

Chapter:
(p.249) Chapter 35 Check your clock against WWV
Source:
Accurate Clock Pendulums
Author(s):

Robert James Matthys

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198529712.003.0035

In the United States, WWV is the obvious time standard to check a clock against. WWV's claimed time accuracy as transmitted in Boulder, Colorado is 10 microseconds short term, and 1 second in 3,000 years long term. The received short-term accuracy is reduced to 0.001 second due to variations in the time signal's transit time. An exception is the better received short-term accuracy of 100 microseconds in WWV's 60-kHz ground wave signal, which can be improved even further to 10 microseconds by using proper averaging techniques. A shortwave radio receiver is needed to pick up the WWV signal. This chapter describes an electronic method of accurately comparing a clock's time against WWV's time.

Keywords:   clock, WWV, accuracy, time standard, shortwave radio receiver, time signal, electronic method

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