[ntp:questions] Re: Which public servers for adjustment?

Richard B. Gilbert rgilbert88 at comcast.net
Tue Dec 21 01:56:32 UTC 2004


Helmut Wollmersdorfer wrote:

> Richard B. Gilbert wrote:
>
>> Helmut Wollmersdorfer wrote:
>
>
>> I'd suggest calibrating against the servers with the lowest delay and 
>> jitter and comparing with the calculated propagation delays from 
>> DCF77, MSF60, and HBG75
>
>
> Thx, that's what I wanted to know.
>
>> If you need better time than that your options are to make GPS an 
>> option somehow or to buy a rubidium or cesium frequency standard with 
>> a clock option and have it calibrated by your national standards 
>> laboratory!
>
>
> For me its more like a hobby than a need. Maybe a oncore GPS in fixed 
> position mode and 1-3 satellites visible will give more accuracy and a 
> used rubidium standard would be nice. But first I want to tune my 
> radioclocks.
>
>> I would not use "prefer" unless you are much closer to one of your 
>> radio sources than to the other two.
>
>
> The distance from Vienna/Austria is approximately
>
> DCF ...  590 km, earthwaves, stable signal
> HBG ...  788 km, interferences depending on weather etc.
> MSF ... 1400 km, skywaves, signal run drifts around a little bit (<1ms)
>
> In normal use "prefer" DCF makes IMHO sense, as it has the smallest 
> jitter followed by the similar configured peer in the LAN.
>
> Helmut Wollmersdorfer

I agree.  Prefer DCF77.

Let us know your results when you get your radioclocks properly calibrated.



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