[RFI] Raspberry PI / Wall wart RFI

[Jim Rhodes]

Yes, at least 2.5 amps of regulated 5 V with a USB-C connector.

On Fri, Apr 2, 2021 at 9:45 PM Dave <rocketnj at gmail.com> wrote:

> They recommend 2.5 amps for a Pi4
>
> Dave wo2x
>
> Sent from my waxed string and tin cans.
>
> > On Apr 2, 2021, at 10:33 PM, N4ZR <n4zr at 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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-- 
Jim K0XU
jim at rhodesend.net