Chris Albertson wrote:
On Tue, Mar 29, 2011 at 7:13 AM, J. Forster<j...@quik.com> wrote:
Even if you can build a perfect receiver I don't see how you can get
around the variable path length issue short of averaging WWVB for days or
weeks.
Yes but you only have to wait once as long as you don't turn it off.
This is OK if the use is only for a second independent reference.
Remember the Hubble mirror problem? I think the best use of WWVB is
to prevent an embarrassing problem like that. That's where they
trusted their supper arcuate machine so much they did not bother with
even a simple and cheep backup test. (Even I could have seen those
errors in 10 minutes using 19th century techniques like the Foucault
knife-edge test)
Actually the interferometric Hartmann test would have been far better
and quicker as it only requires a simple aperture array and a camera an
error of 1mm or so in location of the plate would have made little
difference to the results. This method was used to guide the figuring of
the NOT.
Bruce
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