[time-nuts] Can I get 1 millisecond accuracy with a USB GPS-18

Jim Lux jimlux at earthlink.net
Mon May 13 10:43:00 EDT 2013

rummaged through archives and couldn't find anything..

I've got some GPS-18's with the RS232 and 1pps output.  BUT, I'm 
wondering if anyone has tried to get timing with the USB version (Linux 
or Windows..), and if so, is getting 1 millisecond absolute accuracy 

The underlying USB thing has 8kHz frame rate, but I suspect that the 
serial port emulation (which is probably what they use) might not hold 
it that well.  I can see there being some sort of fixed offset (going 
through hubs and such), but once the configuration is known, is that stable?

Any practical advice?

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