On Wed, Feb 16, 2011 at 11:43 PM, David J Taylor <david-tay...@blueyonder.co.uk> wrote:
> Would you count these as nearer a "working system"? Only needs USB power, > and includes the antenna and cable. > > http://www.sureelectronics.net/goods.php?id=99 > > I'm still waiting for mine to arrive. The advantage of the Oncore GPS is that it is well documented. Motorola wrote some detailed manuals in good English that are on-line. The Sure units are more "ready to use" but come with typical Chinese eBay documentation. Not saying which to get. Either should work. It's not hard to set up an Oncore GPS, just power it and interface it to RS232. the MAX232 chip makes that part easy and you can find DB9 connectors with the chip attached for about $4. But those Thunderbolt units are selling for $100 and are GPSDXOs with very good specs and only need power and an Antenna For many people the Antenna is that hardest part. You need a clear view of the sky and if it snows at your location some setup that keeps it clear of snow and then you need a cable from the Antenna back to the GPS. Running a wire out an open windows works for a test but not long term, Long tern you'd want a pole mount antenna up on the roof. So a few voltage regulators and interface chips is not much work compared to a permanent antenna setup One thing to look at when choosing a GPS is software. Maybe you are going to run an NTP server or you need software that runs on Linux. Or maybe you plan to buy several GPS receivers and want software that can run all of them. Always the old joke is true: A man who has one GPS knows what time it is, A man with two is never sure. So you buy three. -- ===== Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.