Ry wrote:
Speaking of WWVB clocks: does any company actually manufacture a
preconfigured WWVB clock with a serial interface anymore? I've been
unable to find one. Spectracom and the other manufacturers that used to
make them seem to have switched over to GPS entirely.
WWVB Receivers are occasionally available on e-Bay for $100 - $300.
<snip>
I'm 1462.5 km (4.8 ms) from the WWVB transmitters, which is well inside
the coverage area maps on the NIST site. I figure WWVB is my best
(only?) option for a refclock at this location. Is sub-milisecond
accuracy possible using a WWVB refclock?
Possible? Yes. Probable? No! If you want to invest about $35 in an
"atomic clock" You can hang it on your wall and check the reception
indication several times during the work day. If you get solid
reception during daylight hours a WWVB receiver just might give you
sub-millisecond accuracy. If you lose signal during daylight hours,
forget it!
The NIST site says 0.1 to 15
ms phase error, which is two orders of magnitude. I see ~5 ms average
offsets when I sync with nearby stratum-1 servers via NTP. Would WWVB
perform any better?
I'd rather not build a WWVB receiver and antenna if I can just buy one
for use with NTP.
I never had a WWVB receiver to try it with. If someone wants to lend me
some equipment I'll compare it with my GPS refclock.
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