I like to use GPS, DCF, MSF because then I don't have to set the time on the clock, it is very accurate and in clock needs fewer buttons.
Disadvantages are: GPS - The clock location needs to be able to see the GPS satellites, although these days the receivers are so sensitive you can often make these work indoors. MSF/DCF - Can be prone to interference from TV/Computer monitors and even the switcher in the clock. These disadvantages can be addressed by having the receiver unit remote from the clock and then a low power wireless connection between them, but that is getting a bit complicated. It does mean, if you have several clocks, you could have one 'server' sending to all the clocks. Nigel. ----- Original Message ----- From: Nick To: neonixie-l@googlegroups.com Sent: Thursday, July 18, 2013 6:28 AM Subject: [neonixie-l] Re: Using 60Hz line-frequency (US) for your nixie clock All the very earliest nixie clocks used to do this - there are many designs out there that signal-process the line frequency to remove spikes etc. and drive the clock timing via the resultant signal. Three things moved folk away from that - firstly, many countries have de-linked the mains frequency from accurate time, even long-term (more than a day) - its simply not economic to have a false constraint in the mains frequency which is primarily driven by consumer load. Secondly, mains frequency tends to be either 50 or 60Hz, so designs for use globally have to adjust for that and in some countries, you are lucky to get any frequency at all some of the time! Thirdly, RTC chips are plentiful, very cheap and generally provide battery backup so that in the event of brown or black outs, the clock maintains accuracy - most RTC chips provide a xtal stabilised 1Hz output that makes designing such clocks very simple. Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/f81f16fb-b1d7-4f25-8fb6-6165539cab93%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/11C392B802AD4ACFBC240914FF001405%40Vostro400. For more options, visit https://groups.google.com/groups/opt_out.
