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| Antenna in atomic clock |
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| CJay:
2x Rb standards, at least two GPS-DO and a Cs, all sat in my workshop (I may have to admit I have a problem), so yes, atomic standards are available and in reach of the 'average' hobbyist and I'm in no way as rich as some of the guys here, everything I have bought has to be *cheap* (I've blown my entire month's pocket money on one item this month so it's packet noodles and hot water for the rest of the month now but hell, it was worth it :-DD :-DD ) |
| LateLesley:
--- Quote from: fixit7 on May 03, 2019, 06:13:58 pm --- So there are radios that do not need power? A little hard to believe. --- End quote --- Actually, you CAN get radios that do not need power. They've been about since I was a kid in the 70s. There were crystal radio sets which could work with no power supply. They used the received signal to generate the supply, but it was very low power, it wasn't gonna drive speakers. I actually just found someone who designed one, which could work with a speaker. https://hibp.ecse.rpi.edu/~john/xtal.html And everyone's picking on this OP over "atomic radio", give them a break, it'll be one of the time signal receiver clocks, which is tied to an atomic reference clock. thus the "atomic clock". Here in the UK its the MSF time signal, it used to be known as the rugby clock signal. https://www.npl.co.uk/msf-signal Other countries have their own version of this, like WWVB in USA, DCF77 in Germany, or JJY in Japan https://en.wikipedia.org/wiki/Radio_clock |
| AG6QR:
--- Quote from: fixit7 on May 03, 2019, 01:37:14 pm --- --- Quote from: CJay on May 03, 2019, 11:18:37 am ---Doesn't look like there's much in the way of radio receiver in there, I'd be pretty sure it's not a radio clock but, does it set itself when you apply power or do you have to do it manually? The MSF clocks I have flash 12:00 at first (and then 12:01, :02 etc.) until they sync for instance --- End quote --- I have to manually set time when changing batteries. How could a radio controlled clock maintain the time if it has no power? --- End quote --- It doesn't maintain the time without power. When it powers up, it flashes 12:00, and it turns on its radio receiver to grab the time from the radio station and set itself. This may take a couple of minutes. If propagation is marginal, it may not work until nighttime. In some locations, it might never work. |
| windsmurf:
:horse: |
| Richard Crowley:
--- Quote from: Domagoj T on May 03, 2019, 02:29:20 pm ---Are proper atomic clock even available to general public, or within purchasing power of an average civilian? I'm not talking radio clocks, but real caesium/rubidium stuff. --- End quote --- There are many Rubidium oscillators on Ebay for <$100 and some for even <$50 That gets you the frequency accuracy and stability, but not the time synchronization. You can get time sync from GPS. At least as close as you would ever need for private uses. For that matter, if you are getting time sync from GPS, you don't need your own local oscillator anyway. |
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