On Thursday 24 December 2009 1:18:06 am David J Taylor wrote: :::snip::: > David, > > I have the GPS18x LVC mounted inside the house, just near the underside of > a sloping roof, and it sees enough RF there to work well as a GPS server. > As it happens, I extended the cable to twice the length (a long story): > > http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm#usb > > and it still works just fine. So that would give you a 10m run down to > the PC, which might be enough. I would imagine that you could probably > extend the cable to 20m or 30m without a problem (using shielded cable). > So pop your GPS unit as high and in the clear as possible (inside the > house), and run a cable down to the server. > > Or, put you GPS as high and clear as possible, and add a small > Atom-powered PC and a wireless connection to the rest of your network. It > would probably still beat your 1ms. You can get Atom PCs with a serial > port, but they are less popular than those without. One example: > > > http://www.dabs.com/products/shuttle-mini-itx-intel-atom-1-66ghz-s-l-v-sil > ver-black-5HFX.html > > Cheers, > David > If I might be so bold, TermTek makes some nifty little disk-less terminals (PCs sans drives) the 3882, 3778, 3772, 3750, 3550, 3350 and 3370(?) all seem to possess both USB and a (9-pin) serial port. The 3350 is a nice quiet little box. and I should have enough processing power and ram to run decent software. I know you guys are fans of FreeBSD, so might I suggest a TK-3*** with A GPS18x LVC attached to the serial (and one of the USB ports?) with a mostly read only root file system on a thumb drive, attached to cat-5 and wall power. The software could be Linux (or BSD) Distro of your choice, with IPv6 enabled, along with Open-SSH, and NTPd. If you wanted to go all out you could add the consistent clock thing from TAPR, an UPS, wireless internal disk drive what have you. In the us the 3350 has been sold by Diskless Workstations as the LTSP-150, ask Google shopping and stuff.(/plug blob)
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