[time-nuts] Correcting jitter on the 1 PPSsignalfromaGPSreceiver.
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Sep 15 19:06:32 UTC 2014
I don't claim to be able to do the math, but one could probably easily
calculate it from the Fourier frequencies by looking at the attenuation by
frequency over a 1km lengh:
Loss per 100m over frequency:
10M 100M 400M 1300M 2300M
7dB 14dB 28dB 49dB 72dB
So looking at these numbers I am guesstimating a risetime in the us
alongside a good handful of microseconds of propagation delay.
bye,
Said
In a message dated 9/15/2014 11:31:28 Pacific Daylight Time,
hmurray at megapathdsl.net writes:
> Also, another issue with the end termination happens when driving very
long
> coax cables: RG-142 for example has about 60 Ohms center conductor
> resistance and 7.5 Ohms shield resistance at 1km length.
RG-142 is far from low-loss. Does anybody use it at that length?
What's the rise time at the end of 1 km with a 1 ns rise time at the input?
--
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