[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
> 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
>> 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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