4 ms·
By "atomic" clocks (for example https://www.amazon.com/Crosse-Technology-WT-3129B-Atomic-Analog/dp/B0080JIVMW/ref=sr_1_7 https://www.amazon.com/Crosse-Technolog
by wglb 2y ago
By "atomic" clocks (for example https://www.amazon.com/Crosse-Technology-WT-3129B-Atomic-Analog/dp/B0080JIVMW/ref=sr_1_7 https://www.amazon.com/Crosse-Technology-WT-3129B-Atomic-Ana...), and older brands of watches.
I think there are also older industrial applications using this technology to syncronize.
- anaidioschrono 2y agoI love these clocks! I've had a few in every house I've lived in, from all along the West Coast and Midwest.
- lxgr 2y agoSince the equivalent European signal I'm familiar with only covers a single timezone, with unified DST rules, I'm curious: Do these usually have an adjustment button for a time zone offset? And how do they handle DST – do they have an "I'm in Arizona (but not in the Navajo Nation), leave me on standard time" switch?
- V99 2y agoThey usually have an offset and a DST option. So in Arizona you'd choose -7/Off, and never touch it again. In Colorado you'll have to toggle DST twice a year manually, because it doesn't know the rules for when it starts/ends.
- lxgr 2y agoOh, is there no “DST in effect” flag in the signal? As I understand it, the US switches at the same day across the country (for the states that do have it), so that should theoretically be possible.
- deleted 2y ago[deleted]
- quintushoratius 2y agoNot every region of the continental US respects DST.
- lxgr 2y agoI know, but if it does, it switches on the same day as all the others, which could be encoded in the signal, and it seems like it is [1]. So instead of a switch to “add an hour”, there could be one that says “add an hour if the signal says DST is currently in effect”. [1] https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_code https://en.wikipedia.org/wiki/WWVB#Amplitude-modulated_time_...
- joezydeco 2y agoThe time code format does include a DST bit. https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv/wwv-and-wwvh-digital-time-code https://www.nist.gov/pml/time-and-frequency-division/time-di...
- o11c 2y agoYou shouldn't have to toggle DST manually; it's encoded at :57-58. That said, my clock stopped syncing for some reason, so ...
- wglb 2y agoThe one remaining clock I have took a hard fall, and no longer syncs.
- deleted 2y ago[deleted]
- metaphor 2y ago> ...and older brands of watches. Modern watches too, e.g. Casio digital watches marketed as integrating their "Wave Ceptor"/"Multi-Band 6" feature[1]. I still use a 17-year-old (batch code[2] 202A327G) G-Shock GW-530A (predecessor of this active offering[3]) that syncs with WWVB every morning several hours before dawn. [1] https://en.wikipedia.org/wiki/Casio_Wave_Ceptor https://en.wikipedia.org/wiki/Casio_Wave_Ceptor [2] https://shockbase.org/watches/batchcode.php https://shockbase.org/watches/batchcode.php [3] https://www.casio.com/us/watches/gshock/product.GW-M530A-1/ https://www.casio.com/us/watches/gshock/product.GW-M530A-1/
- esaym 2y agoWow, added to wish list!