Posted by
BiBrun on
URL: https://www.es-forum.com/Caable-Modem-Dirty-Electricity-tp2466564p2466668.html
I thought that since 2000 or so linear power supplies
are basically illegal (due to their poor efficency) to
sell with electronics.
You're right that the Stetzer gets rid of differential mode only.
Question is why does the common mode convert back to
differential mode further away? Most likely because of
differences in capacitance to ground on the hot versus neutral.
This doesn't surprise me, but it's also possible you have direct
neutral to ground connections somewhere (other than the
panel I mean... I suppose the signals could be bouncing back
at the panel which might also explain it?) This might be
worth finding and fixing. Easy to test at the panel if you can
remove the ground or neutral bus bar without getting ill
from the meter. Maybe better if you can find a young cheap
electrician to do it. You can also have them check for
connections between neutral wires.
Or just open up every switch box that might have two circuits
live in it and separate the grounds (and the neutrals if they
are tied). You'd be surprised how removing a ground loop
can reduce the fields throughout the house.
BIll
On Thu, Feb 10, 2011 at 8:16 AM, jaime_schunkewitz <
[hidden email]> wrote:
>
>
> I finally have clean electricity again, after
> replacing the Motorola cable modem (Model SB5101U)
> that Comcast provides. I'm using a Linksys
> CM100-T1. The Motorola pegged my Entech powerline
> noise analyzer (180 @ half sensitivity), while the
> Linksys adds nothing to the reading. It even comes
> with an analog 9v AC/DC power inverter.
>
> Here's an anecdote about using shunt capacitors as
> filters. One capacitor brought the reading from 180
> to single digits when plugged in and measured at the
> same receptacle as the modem. However, at other
> receptacles in the house I still measured the same
> elevated readings. And the capacitor had no effect
> on reducing the levels of AM radio noise.
>
> These so called filters appear to short out the higher
> frequencies and quench differential noise at the
> receptacle, however seem to push the noise elsewhere.
> Just an observation.
>
> Eli
>
>
>
[Non-text portions of this message have been removed]
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