On Mon, Feb 29, 2016 at 6:35 AM, Hal Murray <hmur...@megapathdsl.net> wrote:
> The audio stuff seems particularly ugly. > > Are there any good non-GPS options these days? In this context, "good" is > a > bit hard to pin down. My straw man is either something in production or > something like a TBolt or Z38xx that is available surplus at hobbyist > prices. > On Mon, Feb 29, 2016 at 6:39 AM, Hal Murray <hmur...@megapathdsl.net> wrote: tic-...@bodosom.net said: >> If you can get audio they work. The documented accuracy for WWV is within 1 >> millisecond of the time pulse. >Where is that documented and/or can anybody verify that they get results in >that range? First off this is a bit time-nuts relevant because RF timing propagation is germane but the basic pulse extraction is low accuracy and hence not so much time-nut relevant. That also informs the forest for the trees issue here: the original intent (as in Dr. Mills PDP-11 assembler coded demodulator) is a periodic (i.e. daily) clock update. So despite the predicted 1ms accuracy a .1s system error was probably considered acceptable. The WWV refclock shares this operational sense with the ACTS driver. You phone home maybe once a day and, in the case of the ACTS driver, NTPD won't use it unless you're orphaned. Regarding non-GPS. Do you consider a CDMA receiver non-GPS? How about a disciplined oscillator in hold-over? In consideration of the recent GPS glitch is GLONASS non-GPS or are you speaking more broadly (ie. GPS as a synonym for GNSS). And lastly despite the politics it would seem the folks on the ntp-questions and ntp-hackers are a better resource. Unless they're all here. _______________________________________________ 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.