I thought this was interesting... I don't know if this had been already 
mentioned here- probably some list members are already part of the process!  I 
wonder if this would be a spread-spectrum code like the GPS signal?

"[...] Another idea being actively investigated is to add phase modulation to 
the existing WWVB signal while leaving the AM BCD code intact. This would allow 
all existing devices to continue to work, but allow a new generation of 
radio-controlled clocks to be developed.  These new devices would have greater 
processing gain and therefore be capable of reading the time code with a lower 
signal-to-noise ratio."

from  "We Help Move Time Through the Air
Managers of WWVB Explore Options to Improve the Service Further"
by John Lowe, manager of NIST radio stations WWV/WWVH/WWVB.
http://tf.boulder.nist.gov/general/pdf/2504.pdf

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