Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Increasing the Modulation Depth of the WWVb Time Code to Improve the Performance of Radio Controlled Clocks

Published

Author(s)

John P. Lowe, Ken C. Allen

Abstract

The National Institute of Standards and Technology radion station WWVB has officially changed its broadcast format. As of January 1, 2006 the WWVB braodcast signal has increased the depth of the time code modulation to improve the performance of commercial radio controlled clocks in low signal strength areas. The increase in modulation depth effectively appears to a matched-filter receiver as if the transmitted power has increased by 2.0 dB, thus extending the coverage area where WWVB controlled clocks will work properly. This is demonstrated by an amplitude shift keyed (ASK) analysis. The results given by this analysis do not depend on the noise level or the bit error rate (BER).
Proceedings Title
Proc. 2006 Freq. Cont. Symp

Keywords

amplitude shift key, modulation depth, WWVB

Citation

Lowe, J. and Allen, K. (2006), Increasing the Modulation Depth of the WWVb Time Code to Improve the Performance of Radio Controlled Clocks, Proc. 2006 Freq. Cont. Symp, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50349 (Accessed June 20, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created June 5, 2006, Updated January 27, 2020