You are right......................that would make too large of a spacing,
so common sense applies here. Every half inch or so is ok, except around the
RF components, where you might want to drop the vias more densely.

starman wrote in message
...
Pete KE9OA wrote:

I usually go for less than one tenth of a wavelength for maximum spacing
between vias. I never lay out the vias on a grid. This is one of the
things
I learned at one of the EMI/EMC classes I took at when I was working at
Rockwell-Collins. I understand that different folks have different
approaches to board design, and these different approaches do work well,
my
approach has been ok, with boards I have been designing well up to 5GHz.
I
do need to state that I am not the foremost expert in this field; I am
just
a simple soul that is scratching the surface of the RF realm!

Given that the highest HF frequency is 30-Mhz, then 1/10 wavelength
would be about 1-meter. This is much larger than the circuit boards in a
radio like the R8, so how important would it be to adhere to the 1/10
wavelength rule for grounding an HF board?


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