Posted by Drasko Cvijovic on
URL: https://www.es-forum.com/Stetzer-Filters-tp1536046p1536051.html

It is very likely that properly designed filters would effectively eliminate
(filter out) frequencies and disturbancies other than 50/60 Hz sine power
frequency...

But my (probably previously missformulated but still unanswered) question is
why should we expect that such filtering would be of any practical help!?

I have several reasons to doubt that, but I am ready to be assured the
opposite:

- I have never measured anything relevant coming out a home installation.
It is completely different when you measure (as I understand Cindy Sage did)
what is within wire (or coupled, very near), and when you measure the effect
of those currents to the surrounding environment!

- If an oscilloscope (or a spectral analizer) is used to monitor the fields
that impregnate any urban environment (by connecting oscilloscope to some
handy antenna), there is a great number of signals (broadcasting, Dect,
mobile phone masts) that are (generally) overhelming any radiation that
might "leak" from home power instalation. The only strong signal that comes
from installation is power frequency.

- Even if principaly we let the hypothesis that dirty power from wires
somehow afflicts us through any unmeasurable field aspects (like
"longitudinal waves" or whatever), still we have to explain why are we
immune to such aspects coming out of street instalation and the
neighbourhood, which are impossible to filter!


Drasko