[ntp:questions] Re: radioclk DCF doubling

Serge Bets serge.bets at NOSPAM.laposte.invalid
Mon Jul 18 13:15:30 UTC 2005


 On Sunday, July 10, 2005 at 8:19:32 PM +0100, David Woolley wrote:

> It is a fundamental consequence of physically realisable filters that
> they introduce delays

Much thanks for the explanations, David. I more or less understood.


>> pulses that should be in theory 100 ms (or 200 ms), when seen by
>> "radioclk -t" are always shorter, around 92.9 ms (or 190 ms).
> The logic slicing level isn't exactly 50% of the peak to peak range.

Sorry again I feel I don't understand. Do you mean the unfair duration
of low amplitude pulse being only 10% of a period, while high amplitude
is 90%, makes the filter detect faster one edge than the other?


Serge.
-- 
Serge point Bets arobase laposte point net




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