[time-nuts] More ES100 WWVB Measurements

[Tom Van Baak]

> This is good work and I have been following. 
> What caught my attention was the 2 X very fast codes.
> I remember talking to the everset folks early on and the high speed code could be turned on.
> It had not been. The ES100 will not track that code as mentioned.
> Did not think they actually ever turned it on.
> More likely a power cycle left the system turned on.

Paul, Graham, Tim, ...

I've been on contact with Volker (universal-solder.ca) and Oren (ES100 designer). Here's what he says:

>
> The accuracy of the ES100 is limited to 50ms, since the sampling rate
> is decimated to 20Hz in our final digital-processing stage there (this
> was intended for human-read clocks and not for anything more demanding
> than that), but better precision may be derived from it based on
> averaging of consecutive readings.  I regret that the “fast mode” that
> was developed at the time in simulations (and partially tested even at
> the station) was never implemented.  It was to be based on a rate of
> 100Hz instead of 1Hz, allowing for higher accuracy of timing to be
> derived from the broadcast, as well as faster acquisition (the idea
> was to have the data of an entire frame sent every 10 seconds, during
> the “marker”, so you wouldn’t have to wait a whole minute to capture
> it, but higher signal-to-noise ratio would be needed in the reception for this mode). 
>
> Thanks again and Happy New Year! 
>          Oren 
>

/tvb