OK, good, found the bug. Now, iwe wish it were possible to download the firmware, make the correction and then upload...
On Sun, Aug 11, 2013 at 1:14 PM, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > On 08/11/2013 05:18 AM, Mark C. Stephens wrote: >> Okay this is what worked for me: >> >> 1. Removed power and antenna. >> 2. apply power with no antenna. >> 3. send :GPS:INIT:DATE 2007,08,11 >> 4. plug antenna back in. >> >> For some reason if I used the correct date, the Z3815A warped back to 1993. >> >> But I am curious why did this happen today? > GPS weeks begin on sundays. Today is first day of week 1753: > > http://csrc.ucsd.edu/scripts/convertDate.cgi?time=2013+08+11 > > Going back 1024 days gives you week 729 day 0, which occurs on 1993 12 26: > http://csrc.ucsd.edu/scripts/convertDate.cgi?time=1993+12+26 > > A simple way to compensate for the lack of bits is to assume wrapping > occurs, so week numbers lower than som value actually lacks 1024 weeks. > A trivial code like this fixes this: > > if (week < 729) > week += 1024; > > Brilliant until you reach week 1753. > > I've seen this happen at 500 and 512. > > Cheers, > Magnus > >> >> >> --marki >> >> -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Mark C. Stephens >> Sent: Sunday, 11 August 2013 1:06 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Warped back to 1993 >> >> Hal, I can't get it to take, I keep getting E-350 and the time does not >> change. >> Did you unplug the antenna or anything while you changed date? >> >> >> >> >> >> -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Hal Murray >> Sent: Sunday, 11 August 2013 12:54 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Warped back to 1993 >> >> >> ma...@non-stop.com.au said: >>> A Z3805A, a Z3815A and 58534A integrated timing antenna all think it's >>> 26 Dec 1993. >>> What happened?! _______________________________________________ >> Is that off by 1024 weeks? (Looks close, but I haven't checked the details.) >> >> There is a week field in the GPS data stream. It's only 10 bits. >> >> I had that problem on a Z3801A. It did the right thing after I told it the >> date. >> :GPS:INIT:DATE 2011,12,26 >> >> >> > > _______________________________________________ > 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.