"Mark Keith" wrote in message
om...

Also, I'm dubious that "notching" can really work. Both
for us, and them.


Notching didn't work in Japan, and Japan shut down all their BPL. Reason
being, you're dealing with square waves over several octaves of spectrum. As
anyone familiar with square waves knows, they are very rich in harmonic
output, and the first, third and fifth harmonics are not much less in power
than the fundamental. If they notch out 40m, you'll just get to hear the
third harmonic from 2.3MHz, and so on up the spectrum.