Sean wrote...

>Can anyone tell me how accurate WWV's frequency is on the 10MHz signal? I
>want to adjust a crystal oscillator to as close to 10MHz as I can and I was
>hoping to listen to the beat frequency it makes with WWV to do so (what
>gave me this idea is that a device that I have which has a 3ppm max
>deviation 10MHz TXCO which generates a nice slow 4 or 5 Hz beat when I
>listen to it and WWV at the same time in a receiver I have) However, I
>can't seem to find specs on how close to 10MHz WWV is guaranteed to be. I
>was under the impression that a secondary purpose of WWV was as a frequency
>standard, but on NIST's site I can't seem to find that data.

Go to NIST's WWV web site and download NIST Special Publication
432, "NIST Time and Frequency Services", at:

http://www.boulder.nist.gov/timefreq/general/pdf/1383.pdf

You'll find what you're looking for on page 51.

At the transmitter, WWV frequency is said to be accurate to
within a few parts in 10^13, roughly a couple millionths of a
hertz.

HTH...

Dave

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu