Hi They aren’t looking at voice signals, they are looking at the distribution of timing signals. The filters cut off well below voice frequencies. The issue (as originally mentioned) is peaking in very long chains of repeaters. Since the cutoff can be *very* low (just like with a GPSDO), the frequencies involved in a full amplitude and phase sweep are very low as well. If you want very tight db accuracy, that pretty much implies that you have a good number for “zero” frequency …… that puts you into silly season if somebody decides it must be “tested in”.
Bob > On Nov 30, 2017, at 12:10 PM, Attila Kinali <[email protected]> wrote: > > On Thu, 30 Nov 2017 09:39:59 -0500 > Bob kb8tq <[email protected]> wrote: > >> That last decade ( 0.01 Hz period to 0.001 Hz) > > What puzzles me here is, the reason why someone would care > about sub-1Hz frequencies in a telephone system? IIRC POTS > did cut off somewhere areound 100-300Hz anyways. > > Attila Kinali > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
