[time-nuts] Performance verification for time counters
kb8tq at n1k.org
Thu Nov 30 12:42:51 EST 2017
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”.
> On Nov 30, 2017, at 12:10 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Thu, 30 Nov 2017 09:39:59 -0500
> Bob kb8tq <kb8tq at n1k.org> 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
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