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.