[time-nuts] WWV receivers?
nsayer at kfu.com
Wed Oct 26 08:46:07 EDT 2016
If you’re in North America, a CHU receiver is a lot easier to make than WWV/WWVH. The CHU timecode is just BEL 103 AFSK at 300 baud - it was a one-chip solution 20 years ago when I made one in college. On the software side, you’ll want a serial line discipline kernel module of some sort that timestamps the incoming characters. The result is as good as HF radio will get you, which is to say probably 2 or 3 orders of magnitude minimum worse than GPS.
IMHO the diversity of which you speak is exactly what NTP delivers. I believe NIST and USNO run NTP servers that aren’t sourced from GPS. Folks with Cesium clocks could conceivably do the same to provide independent standards.
> On Oct 25, 2016, at 11:54 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> tshoppa at gmail.com said:
>> I'm all for a diversity of systems - putting all our eggs in the GPS basket
>> seems unwise (and I maintain WWV receivers hooked to NTP at home!)
> What is available in the way of WWV receivers? Anybody got a summary handy?
> These are my opinions. I hate spam.
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