The shortwave spectrum is noisy enough as-is, why further pollute it via
powerline communications? I wouldn't want someone in my neighborhood
using such crap that was obviously thought out when the 'net was all the
hype, power lines are noisy enough even without that here. I do hope
stuff like that will be dead and buried in just a few years.

But the fact is that, if BPL signals are heard at all, they are
coherent (have a predictable phase and amplitude) and therefore can
be completely removed at the receiver. This can be done in many
ways, most of which amount to nulling the BPL signals by introducing
an identical signal which is 180 degrees out of phase with the
original.

Neither my Sony ICF-SW7600G nor my AOR AR7030+ do that. For a receiver
to completely null out a particular interfering signal, it would have to
know the signal in its entirety - you'd need an "interference input", so
to speak. No comment.

Stephan
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