On 02/20/14 12:21, Timothy Oefelein wrote:
One of the these days I'd like to get the hardware to run my own
Stratum 1 server, which would make the whole finding peers process
moot. :)
Not necessarily. Trust but verify your local reference clock against
other servers out there. For example, I'm currently seeing about 60ms
of jitter/offset in the SHM refclock from gpsd managing a SiRF II
device. (It was 10 seconds off before I fixed gpsd not to request
messages it's ignoring anyway.). It's USB, but still I'd expect only
1-2ms of offset/jitter, which is fine for my purposes:
(not my pool server)
remote refid st t when poll reach delay offset jitter
==============================================================================
xSHM(0) .GPS. 0 l 15 16 377 0.000 12.617 8.012
+c-98-210-122-78 128.9.176.30 2 u 55 64 377 0.832 -49.285 3.556
+PBG4-gigabit.in 17.171.4.14 3 u 45 64 377 0.756 -49.980 2.588
*clock.xmission. .GPS. 1 u 14 128 377 46.021 -52.549 7.084
-bacon.sorch.inf 129.128.5.210 2 u 48 64 377 185.294 -57.130 5.163
+log1.nierle.com 192.53.103.108 2 u 1 128 377 174.769 -52.600 4.201
+guti.uc3m.es 140.7.62.122 2 u 26 64 377 184.012 -48.588 6.591
-bombast 128.9.176.30 2 u 978 1024 376 9.240 -28.597 11.166
Not to mention reception problems you may have with any radio clock
(incl. GPS), or other failures such as [rugrats] kicking the cord loose,
or pe[s]ts chewing through it, or...
That said, you should be able to manage that for less than $50, probably
much less these days.
--
Jeff Woolsey {woolsey,jlw}@{jlw,jxh}.com first.last@{gmail,jlw}.com
Spum bad keming.
Nature abhors a straight antenna, a clean lens, and unused storage capacity.
"Delete! Delete! OK!" -Dr. Bronner on disk space management
"Card sorting, Joel." -me, re Solitaire
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