[RFI] [Amps] Amp causing RFI

[W0MU Mike Fatchett]

What Tim said!

W0MU

On 2/4/2020 8:20 PM, Tim Duffy wrote:
> Hello Mark:
>
>   
>
> What you are doing (and suggesting others do) with the AC ground – to break it – is not right. It violates the NEC code and is very unsafe.
>
>   
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> Please refer to the NEC. What is posted here on the RFI reflector is viewed by thousands of hams. We must give proper (SAFE) advice.
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>   
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> Please refer to K9YC’s on line work and to N0AX’s book. There is only ONE way – the right way.
>
>   
>
> 73
>
> Tim K3LR
>
> RFI reflector founder and moderator.
>
>   
>
>   
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>   
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> From: Mark Schoonover [mailto:mark at ka6wke.net]
> Sent: Tuesday, February 4, 2020 8:26 PM
> To: Tim Duffy
> Cc: jim at 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.
>
>   
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>   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.
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>   
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> 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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