[ntp:questions] Performance estimation

David Taylor david-taylor at blueyonder.co.uk.invalid
Wed Jun 17 04:38:35 UTC 2020

On 17/06/2020 00:03, William Unruh wrote:
> Unless the cables are properly terminated at boththe gps receiver and
> the computer, this is probably not true. (the velocity of light may be
> under 5ns (ie less than 5 feet between the receiver and the computer)
> but the capacitive charging of the cable, etc if not properly terminated
> would produce a pulse with a rise time of much longer than that.
> Note that it is NOT the antenna that I am refering to, but the cable
> connecting the gps pps to the computer and the capacitance in the
> receiver in the computer and transmitter in the gps.
Bill, this is a 10 cm ribbon cable at 3.3V TTL levels.

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