Hi everyone,



I was talking with my dad about Stetzer Filters last night, versus a whole house

AC powerline filter (that would filter all the electricity entering the house

from the outside).



We don't have a microsurge meter, but my tests with an AM radio show what seems

to be (I'd have to check more thoroughly to be sure) relatively clean (mostly

just static) power coming along the wires.



The exceptions are those that are in proximity/connected to the

computers/modem/router.  We're working toward running those on 12V DC, but until

then, there's some filth on the lines.



Would it be sensible to simply get two or three Stetzer filters and plug them in

where the aforementioned appliances are plugged? Would this clean up their noise

and prevent it from going anywhere else, or am I misunderstanding how the

filters work?



Any other thoughts most welcome, and thank you!



R.

In a message dated 12/07/2009 14:48:11 GMT Daylight Time,

rticleone@... writes:



I was  talking with my dad about Stetzer Filters last night, versus a whole

house AC  powerline filter (that would filter all the electricity entering

the house  from the outside).







Paul uk - Can anyone give any clues on this one any ggod fliters etc  please





[Non-text portions of this message have been removed]

The Stetzer, and most other filters to some extent, work by shorting out

the high frequency range.  If there is any high frequency noise the high

frequency current increases between the source and the filter.  Past the

filter, the HF voltage and current are reduced.



Good multistage filters also have capacitors that do the same thing, but

they also have inductors that block the noise, increasing impedance rather

than decreasing it.  After that they have capacitors that short out the

remaining

HF voltage, so there is still some current.



Also there is a 60 Hz leakage current.  In Stetzers this is more because the

capacitance is bigger.  That means with a Stetzer there is also increased

magnetic field between the service entrance and the filter.  I think if the

power

coming in is clean this would be relatively harmless unless you are within a



couple inches of the wiring.  But with dirty power from the outside it's

another matter.

So the right combination of filters at the service entrance and near the

computer

may be an improvement.  But again they are no help with common mode, and

usually there is some of that too.



Bill



On Mon, Jul 13, 2009 at 7:26 AM, <paulpjc@...> wrote:



>

>

>

> In a message dated 12/07/2009 14:48:11 GMT Daylight Time,

> rticleone@... <rticleone%40yahoo.ca> writes:

>

> I was talking with my dad about Stetzer Filters last night, versus a whole

> house AC powerline filter (that would filter all the electricity entering

> the house from the outside).

>

> Paul uk - Can anyone give any clues on this one any ggod fliters etc please

>

> [Non-text portions of this message have been removed]

>

>

>





[Non-text portions of this message have been removed]