Re: OT: Converting miles/km

Peter Moylan <peter@pmoylan.org> wrote:

On 23/09/24 01:50, J. J. Lodder wrote:

Peter Moylan <peter@pmoylan.org> wrote:

 

The one non-metric measurement that I find useful is "one foot per
nanosecond".

>
Impossible to go that fast,

 
Useful, though, to get an estimate of the time delays across the width
of a printed circuit board.
 
I'm not actually involved in high-speed electronics, but I think the
current rule of thumb is that the speed of signals on a printed circuit
board is about two-thirds of the speed in a vacuum.

Metric still beats you: 30 cm/nanosecond is more accurate.
BTW, just to annoy the dimension fundies, (if any)
it is nowadays quite correct to say that a nanosecond equals a foot,
(or 30 cm) almost,

Jan