Hi We are in a “brave new world” of industry / government interaction. Watching how it plays out with WWVB (through real product) probably will provide a number of people with research topics for years to come. Yes it’s frustrating, a lot of it is as new to them as it is to us. I’m willing to cut them a bit of slack on that basis.
Bob On May 31, 2014, at 5:11 PM, Steven Kluck <[email protected]> wrote: > I have been able to consistently receive the WWVB phase-modulated data of > what is now being referred to as "Normal Mode" since last summer, using an > air-wound coil antenna, multiple op-amp front end, and a PIC > microcontroller setup that I originally used for receiving the > amplitude-modulated signal. > > I think that Bob Camp brings up a legitimate issue when he writes "I kind > of doubt that the watch and clock guys are going to start the fabs turning > out millions of chips until they can test all the formats." > > One observation has been that data interpretation does not look altogether > simple. With the AM scheme, you could easily find the beginning of a > minute frame, just by looking for two consecutive markers. With the PSK > Normal Mode, each second begins with a 13-bit sync word. Sounds simple > enough, but if you see the sync word pattern, don't jump to any > conclusions, because the pattern will re-occur sometimes at other places > within the same minute frame. It strikes me that when product testers > develop test cases, their work is complicated by all of these "special > cases" some of which will not actually occur until decades from now. > > I also wonder if the introduction of new products has been delayed because > of the seemingly capricious manner in which changes are made to the > broadcast specification. Normally, if portions of a communications > protocol are To Be Determined, we see early versions of specifications > which formally reserve certain areas or aspects that are subject to change, > so that early designers can nonetheless work around them. Who wants to put > a trademark on a product that suddenly ceases to operate when the next > unpredictable format change occurs? (Can you tell that I might be a little > frustrated?) > > I've noticed that instrument manufacturers typically have quality programs > that are useful in establishing the reliability of their products. Such > manufacturers may run into a traceability problem in that the NIST's > coverage by quality programs apparently doesn't currently extend to the > Time and Frequency Division. --Steve > > > > > > On Sat, May 31, 2014 at 8:01 AM, Bob Camp <[email protected]> wrote: > >> Hi >> >> Well that’s a bit more information. We seem to be missing the deployment >> schedule on the other new modulation formats. I kind of doubt that the >> watch and clock guys are going to start the fabs turning out millions of >> chips until they can test all the formats. >> >> …… the 100 bps signals looks interesting …. Not real clear how well it >> will do with a <30Hz wide crystal filter. >> >> Bob >> >> >> On May 31, 2014, at 4:14 AM, Tom Van Baak (lab) <[email protected]> >> wrote: >> >>> http://tf.boulder.nist.gov/general/pdf/2719.pdf >>> >>> /tvb (i5s) >>> >>>> On May 31, 2014, at 1:03 AM, "David I. Emery" <[email protected]> >> wrote: >>>> >>>> Well the actual details of the WWVB modulation and time >>>> codes are now published. >>>> >>>> Was just leafing through some journals while doing some >>>> boring system configuration here... >>>> >>>> IEEE Communications Magazine May 2014 has a paper on page 210 >>>> by Yingsi Liang, Oren Eliezer, Dinesh Rajan, John Lowe >>>> >>>> "WWVB Time Signal Broadcast Format and Multi Mode Receiver" >>>> >>>> Seems to tell a lot more... >>>> >>>> -- >>>> Dave Emery N1PRE/AE, [email protected] DIE Consulting, Weston, >> Mass 02493 >>>> "An empty zombie mind with a forlorn barely readable weatherbeaten >>>> 'For Rent' sign still vainly flapping outside on the weed encrusted >> pole - in >>>> celebration of what could have been, but wasn't and is not to be now >> either." >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
