> > Even better, design the board with as much copper filled as possible.
> > This will also reduce etch time a little and save on etchant.
>
> And increase the capacitance of the tracks ?  No thanks.
> I make mostly digital boards and capacitance isn't my friend...

The change in capacitance will be hardly noticeable.  After all, the
signals on the same plane are meeting edge on with a 10 or 20 mil space
between them.  If you can get a pseudo ground plane out of the top layer,
it will even help with crosstalk and received and transmitted radio noise.


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