On 6/2/2011 1:19 AM, Julian, G4ILO wrote:
> What a great idea! It could even output a 10MHz frequency reference for use
> with the K3XREF. But I hope they make it so it works with something we can
> use over here. WWV is not a good enough signal to be reliable.
For ham radio purposes, using HF WWV/WWVH may be acceptable to
some, but precision frequency standards no longer use it. At
10 MHz, a one-second measurement can only yield an accuracy of
1 part per million (10 e-6) - one Hz per MHz - which may be
great for ham radio but is insufficient for today's communication
timing requirements. The concept of the HF "Standard Frequency"
station was great for pre-1960s technology.
That's why WWVB (and WWVL in its time) were put on the air.
The ultimate, of course, is a cesium or rubidium standard (1980
technology) having 10 e-9 or better accuracy.
All it takes is money.
-- 73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
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