Dont you have GPS/Cs locked cell networks anymore in the US? http://www.endruntechnologies.com/cdma.htm
-- Björn > In the real world, if GPS does not work, the WWVB change means you either > have to buy the XW stuff or go do something else. > > YMMV > > -John > > ================= > > > >> On 9/26/12 7:11 PM, J. Forster wrote: >>> But if someone here designed and built a $100 receiver and offered it >>> to >>> the group, that could well violate some of their IP. >>> >>> As to building a home brew receiver and certifying a onsie so your >>> lab's >>> cal is traceable, I'd certainly not trust a cal done that way. >>> >>> Doing spacecraft communications is hardly the same thing. >>> >> >> >> >> Well..if you're trying to do NIST traceable cals in a legally acceptable >> way, then it's very unlikely that any homebuilt receiver that infringed >> the patent would be acceptable, from a patent standpoint. The general >> exemption to practice the invention is for development of a new >> invention, not to make use of it for other reasons (otherwise, the >> patent wouldn't be particularly useful in terms of exclusivity). >> >> OTOH, if you cobble up a (non-infringing) receiver and validate its >> performance analytically, why wouldn't that be acceptable for a >> traceable calibration. It's no different than using a homebuilt quartz >> oscillator as a transfer standard, is it? >> >> Now, if you're selling calibration services, it would be a tougher sell >> to your customers: they'd have to believe in your analysis or oscillator >> building. This is in the sense that if I use a HP 105, the long history >> and tradition of HP is essentially standing behind the design and the >> published performance standards; a homebuilt standard has a higher bar >> for the great unwashed public. >> >> If you want traceability for, say, a journal article, then I think the >> bar is set differently. For state of the art stuff, the article usually >> describes the calibration approach, and it's up to the reader to decide >> if you did it adequately. >> >> >> >> >> _______________________________________________ >> 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. >> >> > > > > _______________________________________________ > 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. > _______________________________________________ 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.