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Re: [RFI] Raspberry PI / Wall wart RFI

To: N4ZR <n4zr@comcast.net>
Subject: Re: [RFI] Raspberry PI / Wall wart RFI
From: David Gottschalk <dave@highredline.com>
Date: Sat, 3 Apr 2021 09:04:26 -0400
List-post: <mailto:rfi@contesting.com>
Are you saying these are quiet power supplies? Not sure I follow the
suggestion.

Thanks.

On Fri, Apr 2, 2021 at 10:33 PM N4ZR <n4zr@comcast.net> wrote:

> Jameco has a bunch of 5 and 12-volt linear wall warts for quite
> reasonable prices.  For example, their 5V unregulated 800 ma wall wart
> is $3.90, and a 12V 2 amp unit is $13.95.  There are a lot in between.
>
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
>
> On 4/2/2021 8:49 PM, Jim Brown wrote:
> > That's because it's a switch-mode power supply. What voltage and
> > current?  Depending on that, it may be possible to re-purpose an old
> > linear wall wart. Also, study my tutorials on chasing and killing RFI.
> > They include specific advice on subbing the linear supply.
> >
> > Text:  http://k9yc.com/KillingReceiveNoise.pdf
> > Slides: http://k9yc.com/KillingRXNoiseVisalia.pdf
> >
> > 73, Jim K9YC
> >
> > On 4/2/2021 5:15 PM, David Gottschalk wrote:
> >> I'm wondering if anyone has had success finding a wall wart for a
> >> Raspberry
> >> Pi that doesn't make horrific RFI on HF (or really any switch mode power
> >> supply that isn't noisy!)
> >>
> >> I recently discovered the wall wart for my Raspberry PI (that is mounted
> >> outside in a water proof enclosure for my 4G internet) is making S7
> >> level
> >> noise on 80m. Unfortunately, my 80m loop is currently pretty close to
> >> it.
> >> When the PI is battery powered, or off, it's S4 noise level here
> >> (This is
> >> in the middle of the day). 60m also seems to be severely affected as
> >> well.
> >>
> >> I found this on Amazon, but it seems like it's more of a AC line
> >> conditioner, but might be worth a shot. Any feedback would be greatly
> >> appreciated.
> >>
> >>
> https://www.amazon.com/iPower-Supply-International-Travel-Adapters/dp/B01GNNXP0Y?ref_=ast_sto_dp&th=1
> >>
> >>
> >> 73,
> >> David
> >> KN4ZKT
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> >>
> >
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