For decades I used a homebuilt LED shack clock using a GI clock chip AY5-1224. It used the mains frequency for time keeping so the long term accuracy was good.
Recently it became faulty and I could not get a replacement chip, so I decided to build something similar but more modern. (I do have a clock that is synchronised to 60KHz MSF but it is local time only, not UTC). I wanted something that would just give me auto setting, choice of UTC or Local time with auto DST. A bit of overkill for a 4 digit shack clock, but I used an Arduino, a GPS module, and an IR controller to switch modes etc. I did try it without the GPS conditioning but the RTC I had was very poor and even with calibration routines was less accurate than my old mains frequency clock, so I went for GPS which gave me auto setting as well. Nobody in their right mind would probably want to duplicate it, but anyway I put the details on: http://sourceforge.net/projects/arduinoledgpsclock/ Still to put it all in a box, but it works great. Full disclosure: I am a time nut! ;-) 73 David Anderson GM4JJJ > On 27 Nov 2014, at 00:25, Bob <[email protected]> wrote: > > I built my own 24 hr dual zone station clock. It uses a WiFi link to keep > synchronized time. Never have to set it and always accurate. > > Details: http://wb4son.com/wpblog/?page_id=716 > > 73, Bib, WB4SON > > > > >> On Wednesday, November 26, 2014, Ken G Kopp <[email protected]> wrote: >> >> I have a couple of JAMECO kit 24 HR clocks with 1" 7-segment red display. >> They aren't WWVB-synched. >> >> 73 >> >> Ken Kopp - K0PP >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] <javascript:;> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] <javascript:;> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
