Re: Line Noise Interference Question

[nobody@xxxxxxxxxxxx (Dave Houston)]

A filter designed for X-10's 120kHz should "fix" a signal sucker so I think
you probably have a noise source. The fact that you only have the problem
when the PC is on also points to it being a noise source.

It may be that the frequency of the noise is beyond the bandwidth of the
filter but not beyond the bandwidth of the affected switches. In another
thread, Dan Lanciani has indicated X-10 modules and switches will respond to
and can be "jammed" by frequencies above 200kHz. The filters may not be
designed to block such high frequencies.

Many Digital Volt Meters include a frequency counter function but I don't
know whether they can handle a situation like this where a noise source is
riding on the 60Hz line frequency.

"random735" <random735@xxxxxxxxx> wrote:

>I'm gonna latch onto this topic since I think my problem is also line
>noise or a signal sucker....
>
>I've got a couple x10 wall switches which do not work when the PC in my
>living room is turned on.  Note that if the powersupply switch is on,
>but the PC itself is not booted, things work fine.  I don't know if
>that matters.
>
>Anyway, I purchased the smarthome 10amp filter and have been able to
>verify that the filter works by plugging modules into it and verifying
>that i couldn't control them, but when I use this filter on the PC,
>there seems to be no effect at all...the x10 switches still only
>respond when the PC is off (but the powersupply can be on or off).
>
>I'm assuming this is just a really noisy/signal sucking PC or
>something, but has anyone experienced anything like this where even a
>filter isn't sufficient?  I've tried plugging the PC directly into the
>filter and then into the wall (no surge protector) and that didn't
>matter either.