Posted by jaime_schunkewitz on
URL: https://www.es-forum.com/Caable-Modem-Dirty-Electricity-tp2466564.html

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