[time-nuts] Looking for advice to get a submillisecond setup
Hal Murray
hmurray at megapathdsl.net
Fri Feb 20 02:36:56 EST 2015
jimlux at earthlink.net said:
> So really, it's a matter of finding a place to put your Garmin receiver and
> string a cable that's not too long to your *nix box running ntp.
The "place to put your Garmin receiver" may not be as simple as it sounds.
It needs a good view of the sky. Roof is best, but a window may be good
enough.
A machine room is unlikely to work, even if you have a good window. Too much
EMI. An elevator control room may have similar problems.
I've thought about building a pair of boxes that would use standard CAT-5
cables as an extender for this sort of thing. 4 pairs works nicely: power,
TX, RX, PPS.
> People have done it with a Rpi, if you want to go that route.
The RPi has its Ethernet chip connected by USB so that adds a bit of fuzz.
I should try to measure that.
--
These are my opinions. I hate spam.
More information about the time-nuts
mailing list