Bob,
The "cheapest" GPS receiver I ever bought costs $100 compared to the > $25
for the WWV clock. That was a couple of years ago, and the cost of both
has come down. That's the why.
Chas
At 12:34 AM 1/9/2005, Robert Rennard wrote:
Why not just use a cheap GPS receiver instead of a WWVB receiver. It should
work anywhere in the world, and give time keeping accuracy better than 1
microsecond relative to UTC. Most of the time location accuracy is around
10-30 meters, so equivalently the time error at a GPS receiver is 35 to 105
nanoseconds or so relative to GPS time that is maintained to within 100
nanoseconds of UTC. If you want to see the past week's relative error, try
http://tycho.usno.navy.mil/gpstt.html.
The Sprint PCS and Verizon networks, and probably others, are synchronized
to GPS as well, but I have no source for the time keeping accuracy produced
by your connected wireless phone.
Bob Rennard, N7WY
USAF GPS Program Office class of 1978
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