But wouldn't the CB device op be required to make changes? He's the one
causing the interferance. My memory of such things is quite dusty.

The part 15 device is the bottom of the food chain.
It is required to accept any and all interference, including that which may
cause undesired operation.

This assumes that the other device is either part 15, or unmodified CB, or
commercial licenced radio (unmodified), or ham radio operating in-spec.

If I read them right, a modded CB, or one with an amp, or a ham radio that
was operating out of spec, would be given the burden of cleaning up the
problem.
If you're operating illegally, then you go below the part 15 devices.


--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR