"David J Taylor" <[email protected]> writes:
>jack wrote: >> Hi everyone, >> >> First of all, I thank you for all your response. >> >> I understand the best solution would be using an IRIG board and that's >> what we had been using. We are now trying to make our product more >> compact by using a small single board PC with no RS 232 or PCI slot >> (no slot at all). Currently I am using GPS antenna with a USB >> connection. >> >> I also understand that if I can get a small PC with one genuine RS232, >> I can use Dave Hart's solution as tested by David. I will try to my >> best to steer the project towards this direction. >> >> Right now, I am trying to find the best GPS antenna that outputs at a >> consistent pace (better if the output can be configured so I only >> receive time stamps). Any recommendations wrt that? >> >> Thanks again. >> >> Jack >Jack, >GPS18 LVC > https://buy.garmin.com/shop/shop.do?pID=223 >GPS18x LVC > https://buy.garmin.com/shop/shop.do?cID=158&pID=27594 >The newer "x" version appears to be a lot more sensitive, at the expense >of somewhat higher current consumption. You can tell the LVC version what >sentences to send. Better check the technical spec to see what the USB >one can be told to do: > http://www.garmin.com/manuals/GPS18x_TechnicalSpecifications.pdf Unfortnately, the LVC is a serial port output, plus a PPS output. The USB version has no PPS output and is liable to have pretty bad timing (where good=usec). >As others have said, the single-board PC with FreeBSD would probably be >the best solution. I would go for that, except I happen to have a Windows >PC which will do well enough for my purposes (say: within a millisecond). >I've even heard that you could perhaps use a router as a compact Linux PC, >and use the serial port which is either available on the box, or as a >header on the PCB. >Cheers, >David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
