[ntp:questions] Re: Garmin GPS18USB and NTP on Win2k
brad at stop.mail-abuse.org
Sun Jun 26 03:31:42 UTC 2005
At 6:32 PM -0400 2005-06-25, Richard B. Gilbert wrote:
> I have not tried it myself but I have read reports the the USB interface
> is ill suited to timing applications; that the latency is high enough to
> produce large values of jitter and offsets.
That plus the fact that the OP is using Windows would easily be
enough to account for the kinds of problems being described.
> USB does work well for navigation but I would not use it for timing.
And I'm not sure that this particular model of GPS device is good
for timing use even if the USB interface didn't add its own set of
This vendor does have other models which don't use USB that are
known to be at least reasonably decent, but I don't know how much
internal electronics and stuff that they share with this model.
Brad Knowles, <brad at stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/> for more info.
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