Online Pitch source

[Geoff Sykes]

Here is a link to the WWV, (NIST), broadcast wheel. 

http://tf.nist.gov/stations/wwv-wheel.htm

Note that A440 is broadcast for about 45 seconds during minute two of every
hour. Anyone with a short wave radio receiver can pick it up. Alternatively,
you can monitor the broadcast by calling 303-499-7111. That is NOT a toll
free number btw.

Here is a link to the NIST description of their A440 tone. They're talking
directly to us as piano tuners.

http://tf.nist.gov/timefreq/general/glossary.htm

Page 37 of the link that Mark provides offers a short description of the
accuracy of the WWV A440 tone. Then, on page 59, it offers a pretty good,
(short), description of how piano's and piano tuners use this tone. Pretty
interesting reading indeed. Thanks Mark. 

-- Geoff Sykes
-- Assoc. Los Angeles



-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Mark Schecter
Sent: Sunday, May 14, 2006 9:20 PM
To: Pianotech List
Subject: Re: Online Pitch source



Ric Brekne wrote:
> Hi folks
> 
> Does anyone know if there is an online pitch source available yet for
> calibrating ETD's

Hi, Ric.

I know this doesn't directly answer your question, and I think you're in 
  Europe somewhere, so it probably won't help you. But others especially 
in the U.S. might be able to use this information.

The National Institute of Standards and Technology (NIST) broacasts 
standard frequencies on radio stations, and some, including A440, are 
available by telephone. This document describes the services they provide:
http://tf.nist.gov/general/pdf/1383.pdf

It's pretty interesting.

-Mark Schecter