We have a bunch of Raspberry Pi 3B at work which are powered off the USB port
of the Dell monitor they are plugged into, so I think the draw is quite low on
a bare Pi. A standard USB port provides 500ma, and this monitor may provide a
bit more, but I doubt it’s an amp. As someone said, they spec it high in case
you plug in high draw accessories, like USB spinning hard drives or CD drives.
If you plug 4 of those accessories into a Pi, and they each draw 500ma, then
obviously the power supply feeding the pi needs to cover that. That accounts
for the majority of the 2+amp requirement.
> On Apr 2, 2021, at 8:15 PM, David Gottschalk <dave@highredline.com> 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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