On Mon, 24 Mar 2008 18:10:15 EDT, Klystron wrote:

GPS can only be used where the satellites can be "seen" by the
receiver.


In or near the continental US, that is not an issue.

It is a big issue in my comm room which is partially underground with
concrete walls (what they call a "daylight basement" here) where
neither WWVB nor GPS signals penetrate. I have not yet found an
"atomic clock" (either digital or analog) that has an external antenna
collection - they may exist but not at the consumer level. The
consumer-grade clocks that I have sync well on the "upper" story but
do not hold their accuracy for long.

And to add insult to injury, the analog wall clock that I use by
intent has a face with the marine "silent period" and "auto alarm"
markings, a configuration well known to shipboard radio operators. For
a $20 quartz clock it keeps time remarkably well, considering that I
have to manually adjust it at "DST" time changes anyhow.
--

73 de K2ASP - Phil Kane

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon

e-mail: k2asp [at] arrl [dot] net