Actually reviewing the wiring diagram for a standard breaker box and the
ground wire isn't attached to a circuit breaker at all.
https://www.do-it-yourself-help.com/circuit-breaker-wiring-diagrams.html
73! Mark KA6WKE
Website: https://www.ka6wke.net
On Tue, Feb 4, 2020, 21:25 Mark Schoonover <mark@ka6wke.net> wrote:
> Frank,
>
> FINALLY someone actually explains why what I've done is wrong. It's an
> easy remedy to put things back. I'll also update my video and remove this
> advice.
>
> 73! Mark KA6WKE
>
> Website: https://www.ka6wke.net
>
> On Tue, Feb 4, 2020, 21:09 <donovanf@starpower.net> wrote:
>
>> DANGER
>> DANGER
>> DANGER
>>
>> Mark's advice should not be copied by anyone who respects their lives
>> and the lives of anyone living in or visiting their shack or home.
>>
>> The ground wire in AC wiring provides a low resistance path back
>> to the circuit breaker through a low resistance wire normally carrying
>> very low current. Cutting the third wire significantly degrades the
>> performance and reliability of the circuit breaker protecting electrical
>> equipment on that branch circuit.
>>
>> I have never encountered an RFI related problem that traces back
>> to the ground wire in an AC power cord. In the very unlikely event
>> that you actually need to break this path, the only safe approach is
>> an AC isolation transformer. This approach is sometimes needed in
>> very large industrial facilities where low level signals are interconnect
>> equipment racks separated by hundreds of feet.
>>
>> 73
>> Frank
>> W3LPL
>>
>>
>> From: Mark Schoonover [mailto:mark@ka6wke.net]
>> Sent: Tuesday, February 4, 2020 8:26 PM
>> To: Tim Duffy
>> Cc: jim@audiosystemsgroup.com; Amps
>> Subject: Re: [Amps] Amp causing RFI
>>
>>
>>
>> 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@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@contesting.com] On Behalf Of Mark
>> Schoonover
>> Sent: Monday, February 3, 2020 11:04 PM
>> To: jim@audiosystemsgroup.com
>> Cc: Amps
>> Subject: Re: [Amps] Amp causing RFI
>>
>> On Mon, Feb 3, 2020 at 7:57 PM Jim Brown <jim@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.
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> _______________________________________________
>> RFI mailing list
>> RFI@contesting.com
>> http://lists.contesting.com/mailman/listinfo/rfi
>>
>>
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