The alpha factor in the lowpass filter is a function of hw.freq, not of realfreq. Normally the difference is small, but in case of noise realfreq tends to wobble which could cause the the filter to be more highpass, resulting in more noise being passed through.
The alpha factor in the lowpass filter is a function of hw.freq, not of
realfreq. Normally the difference is small, but in case of noise realfreq
tends to wobble which could cause the the filter to be more highpass,
resulting in more noise being passed through.

We still derive the sleep time from realfreq, because this gives a more
fair sleep time under normal circumstances.

rene0/dcf77pi,rene0/dcf77pi