[Amps] Amp causing RFI

[Mark Schoonover]

There can be two paths to ground. One from the back of your equipment to
the station ground then back to house ground. The other path is from the
ground in the outlet back to breaker box to house ground  then back to
station ground. That creates a large loop depending on how much AC wiring
involved.

 I use several of those three prong to two prong AC adapters to break the
path in the AC ground leaving just one path to ground through station
ground. All chassis grounds are connected to AC ground so electrical safety
isn't compromised. Really cleaned up a lot of noise with my station.

The main video about RFI on my website I drew it out on a whiteboard. It's
about 2/3 of the video.

73! Mark KA6WKE

Website: https://www.ka6wke.net

On Tue, Feb 4, 2020, 16:32 Tim Duffy <k3lr at k3lr.com> wrote:

> Hello Mark,
>
> I am confused. What does a connection to earth ground have to do with
> ground
> loops?
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Mark
> Schoonover
> Sent: Monday, February 3, 2020 11:04 PM
> To: jim at audiosystemsgroup.com
> Cc: Amps
> Subject: Re: [Amps] Amp causing RFI
>
> On Mon, Feb 3, 2020 at 7:57 PM Jim Brown <jim at audiosystemsgroup.com>
> wrote:
>
> > On 2/3/2020 7:48 PM, Alek Petkovic wrote:
> > > ndeed. It has also helped me and most ham friends I know on numerous
> > > occasions.
> > >
> > > Adding a few shallow buried wires to the ground rod has also worked
> well
> > > for me.
> >
> > Balderdash. The earth is not a sump into which noise, RFI, and other
> > trash is poured. Comments like this bring to mind the infinite number of
> > monkeys and typewriters producing Shakespeare.
> >
> > 73, Jim K9YC
> >
> >
> What having a decent ground does is eliminate the possibility  of ground
> loops provided the ground is lifted from the third pin of the AC plug. I
> did a comprehensive RFI video on the subject and show how ground loops can
> happen and what to do to eliminate them. Quite possibly the #1 cause of
> RFI. You can watch the video in the link below.
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>