[Elecraft] OT: WWV-driven station clock that displays zulu time

[Phil Kane]

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