Other way round, if the propogation speed is half (which sounds about
right, Er of FR4 is about 3.5 to 4 at 1GHz) then the wavelength with be
double. V = f * lambda. So at 1Ghz wavelength with velocity factor of
0.5 will be about 600mm.

Regards, Kevin

Olin wrote:

> > Something to think about:  At 1GHz light travels just under 30cm,
> > often less than the depth of your case, in one clock cycle.
>
> And that's the propagation speed in vacuum (30cm or about 1
> foot per nS). Figure about half that for an electric signal
> on a transmission line, like a PC board bus trace.  So 6
> inches of PC board trace is one clock cycle at 1GHz.  Still
> want to build this yourself?
>
>
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