This page also shows the breakdown of the various frequencies and time of day. http://www.nist.gov/pml/div688/grp40/wwv_format.cfm WWVH broadcasts it at 1 min after, WWV at 2 min after the hour. It's skipped during the first hour (UTC) of the day. Rob On Jan 21, 2011, at 09:28 , Susan Kline wrote: > On 1/21/2011 7:06 AM, Robert Scott wrote: >> >> The only A440 I know of that is guaranteed to be accurate is the one on shortwave radio station WWV and available over the phone by calling 303-499-7111 in Colorado. But keep in mind this 440 Hz tone is only available for 45 seconds each hour, starting at exactly 2 minutes after the hour. > > Does the Bureau of Standards have a website? They might offer a 440 sine wave there? > > Susan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110121/736afb95/attachment.htm>
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