In article <[EMAIL PROTECTED]>, Serge Bets <[EMAIL PROTECTED]> wrote:
> Thanks for your reply. I'm not sure to have enough background knowledge > to understand it fully. You mean the filter removing 77.5 kHz carrier to > keep 1 Hz pulses needs 17 ms to recognise the lower amplitude during the No. The filter removing interfering noise and signals above about 77.55 kHz and below about 77.45kHz. It is a fundamental consequence of physically realisable filters that they introduce delays because the signal cannot start rising before the input signal starts to rise and cannot rise fast and have a low bandwidth. Actually, post detection filter that strips the carrier and its harmonics may have a similar bandwidth, so may also contribute to the delay, but it is not the most important filter in the receiver. > There is something strange: These 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). What could explain that? The logic slicing level isn't exactly 50% of the peak to peak range. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
