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/20110121/3481da57/attachment.htm>
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