[ntp:questions] Timing GPS recommendations
lausts at acm.org
Mon Aug 20 20:35:19 UTC 2012
On 2012-08-20, unruh <unruh at invalid.ca> wrote:
>>> No The sure is 10s of ns device. Unfortunately this is useless as you
>>> cannot get the time into your computer to better than usec. The
>>> interrupts are not serviced fast enough on any PC to give better than a
>>> few us and the interrupt routines get delayed on a working system by
>>> more than that at times (eg due to disk priority, or things switching
>>> off interrupt processing).
>>> You would have to build a special board for your computer to better than
I am also using a Thunderbolt with one of Ackermann's Clock-Block
boards to replace my motherboard clock. The 10 MHz output from the
GPS receiver is divided by the Clock-Block board. This sync's the PC
with the GPS constellation and without requiring an interrupt from the
CPU. The installation requires removing a surface mount part from the
motherboard and a connection to the divider board.
There are ways to bypass the CPU interrupt requirements if you have
the proper tools.
PGP KeyID = 0x5F22FDC1
GnuPG KeyID = 0x620836CF
More information about the questions