Ok, I've reduced the operating speed of my model airplane monitor down from
a 4 MHz crystal to a 1 MHz RC oscillator.  Looks like it works pretty well,
except the LED display flickers a LITTLE bit between updates because of the
overhead calculations.  No big deal, it's barely perceptible if you're not
looking for it.

So I gather that this means I'm exempt from FCC compliance, but do I still
have to perform any sort of formal testing?  Or do I just wait for the FCC
to complain and look into it on their own, only to find out that it's
exempt?

The only thing I'm at all concerned about is the fact that when I go to a
production PCB, the traces will be laid out slightly differently so the
capacitance might change the operating frequency.  I suppose I'll have to
try it and change the R value at that time.

--Andrew

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