[ntp:questions] NMEA ref.clock better than my ISP's timeserver?

David Woolley david at ex.djwhome.demon.co.uk.invalid
Thu Jun 11 13:25:10 UTC 2009


David J Taylor wrote:

> 
> David, if you have UTP cable, I think that's four twisted pairs, so I 
> would just use one pair per signal (TX, RX, PPS)  and the remaining pair 
> as an earth/+5V.  Unless you have a noisy electrical environment, I 

When used with proper balanced drivers and receivers, twisted pair is 
often better than coax.

For any type of cable, group delay characteristics may be more important 
than characteristic impedance match.




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