>Another trick that seems like cheating but is legal is "spread spectrum"
>clocks.  Here the clock frequency is intentionally dithered a little (i.e.
>frequency modulated with noise).  That way the emissions show up on a
>spectrum analyzer as a broad hump rather than a narrow line.  Since the
same
>energy is spread over a wider bandwidth, its peak intensity is lower, and
>that's what is spec'ed by the FCC.  Supposedly that is OK because it is the
>peak intensity that matters most as far as interference with intentional
>signals is concerned.


Which can sort-of :-) be achieved with a PIC by returning the crystal
capacitors to Vcc rather than to ground.

RM

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