On 2012-08-20, unruh <[email protected]> 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 >>> usec. >>> 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. Tom -- Public Keys: PGP KeyID = 0x5F22FDC1 GnuPG KeyID = 0x620836CF _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
