WWV still exists although you won't get it on your AM radio station. If you have a shortwave radio, you can find it at 5 10 or 15 Mhz on the dial. So depending on the time of day, solar flares, and your location, you should be able to get one of those. What usually works for me is the higher the sun, the higher the frequency. I believe they also have a phone number you can call to get the tones. Don't quote me (unless I'm right :-) ), but I think Tunelab uses this phone number to calibrate their program. Regards, Rob McCall McCall Piano Service, LLC www.mccallpiano.com Murrieta, CA 951-698-1875 On Jan 20, 2011, at 20:48 , Bill Fritz wrote: > Well, I didn't quite find what I was looking for... but in the 1930/40's, the USA had a radio station (WWV) that actually added the output 440Hz for use in calibration. > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110121/c9d59755/attachment.htm>
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