[time-nuts] Nutty time-nuttery with WWVB
hbreuer at debitel.net
Fri Nov 11 05:10:18 EST 2016
Well I guess I am lucky to live only 20km from the DCF77 transmitter. I can receive DCF77 with a wet finger. I can even use a DCF77 controlled OCXO as my 10MHz standard. Probably not as good as a GPSDO but should be within 1x10^-10 or even better, well enough for my hamradio applications which is shortwave to UHF.
If I ever get to it I will try to measure the frequency error of the DCF77 controlled oscillator over the day. I guess not much difference as I receive groundwave all day.
Even at my second home in southern France I have a strong DCF77 signal during the night with an indoor antenna (5cm ferrit rod).
Von meinem iPhone gesendet
> Am 11.11.2016 um 09:14 schrieb Clint Jay <cjaysharp at gmail.com>:
> I thought the same at first, but then I thought a little more, it may not
> be time nut standards of accuracy but...
> It's possible to buy ESP8266 modules for a couple of pounds, they will run
> NTP, if you want to go up market then a Pi Zero.
> Hooked up to a cheap DS1307 module or one of the higher stability ones,
> then your choice of display, cheap SPI TFT, retro VFD or Nixies, you could
> build an NTP synchronised clock for under £10.
> Rolling it yourself like that would allow you to negate the security risks
> associated with IoT as you'd have control of the security aspects.
> On 10 November 2016 at 22:59, Ruslan Nabioullin <rnabioullin at gmail.com>
>>> On 11/10/2016 05:46 PM, Tom Van Baak wrote:
>>> To be honest, this is very impractical and backward-thinking.
>>>> I would suggest instead upgrading to the Internet-of-things paradigm,
>>>> these time-of-day displays with full computers running NTP and connected
>>>> to your LAN (Android smartwatches; repurposed old smartphones, tablets,
>>>> laptops, etc.; and smartclocks
>>> Hi Ruslan,
>>> Please tell me this comment is humor or maybe just trolling.
>>> Or are you actually serious?
>> I am absolutely serious.
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