[time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

jimlux jimlux at earthlink.net
Fri Dec 8 13:13:34 UTC 2017


On 12/7/17 1:29 PM, Bill Hawkins wrote:
>

> So yes, this could be interesting for a hobbyist, but it won't add
> anything to Science.
> A MASER is overkill. Heck, so are Rubidium and Caesium.
> A naked crystal will be rock solid compared to received WWV.
> 
> OTOH, NTP has marvelous mathematical tricks to reduce Internet
> propagation delay.
> A scheme to reduce varying atmospheric delay would be useful, if there
> weren't much better ways to get a standard frequency.
> 

What you are talking about is "better ionosphere modeling", which is 
something that a lot of people have spent a lot of time and effort on, 
without a lot of success.  That said, there are some real time ionograms 
out there that are fascinating to watch.  It doesn't take a very 
sophisticated receiver to receive the signals from a variety of 
ionosonde transmitters.

Juha Vierinen has a variety of interesting software:
http://www.sgo.fi/~j/gnu_chirp_sounder/

Juha also has done stuff with measuring the frequency of beacon satellites

http://www.sgo.fi/~j/jitter/web/






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