v...@darkbeer.org said: >> What's your current collection? > I don't have any right now other than the various GPS chips and boards on > the way to run off of GPIO connections.
You should probably get a couple of the USB "mice" or hockey puck style units. They run $25-$50 each. Most speak NMEA and don't have PPS. SiRF used to have most of the market but I think uBlox is getting in there now. Eric reports that gpsd had nasty troubles with the SiRF-S4 aka Star Vi. It's newer than the -S3 (aka Star III) so I expect the S3 may be impossible to get any more. If you can find one, I'd grab it unless the price is insane. Odroid has a uBlox USB unit for $25. It would be good to be able to test PPS over USB. The no-soldering approach is to get one of the 601W. (I think that's the right number.) Gary may still have some or Mark may order a batch. The soldering approach is to get a Sparkfun breakout board and a USB-serial breakout and add several wires. For a real serial port, the Garmin GPS-18X LVC has PPS but needs soldering and power. You can steal power from USB. There are 2 flavors of GPSDOs that are popular with hackers and hams because they have been widely available on the surplus/recycled market at reasonable prices. They are older units so they need a good antenna location. One is the Trimble Thunderbolt. I think it was used in 911 call centers. The other is the HP Z3801A. I think it was used in cell phone towers. There are various other Z38xx units that speak roughly the same protocol and there is a 5xxxx part number for the still in production version. They tend to show up on eBay in batches. There is no current good deal. There is a TBolt with power supply and antenna for $450. There is a package that claims to be a Z3801A for $450. I don't know what it really is. The picture is not the old/real Z3801A. -- These are my opinions. I hate spam. _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
