"qrv@kd4e.com" <qrv@kd4e.com> writes:
> I just discovered that the 5v USB adapter I installed in my
> '86 Suburban is a RFI-monster.
>
> If the USB cable is anywhere near a radio it wipes-out SW.
A few datapoints:
I have a few Anker dual-port lighter/USB devices. WIth them in the
shack, charging phones, and running an esp8266, I don't hear them.
That of course doesn't prove totally quiet; it means less than my
other noise.
I tried a DROK buck converter board, to make 5V from 12-15V for an
ESP8266, and it was dreadful in terms of noise on the voltage rails
for supporting an ADC to measure the batteries. Have not observed RFI
because it didn't work well enough for purpose, and needs
bypassing/filtering obviously.
I have a few other lighter/USB things, and none of them have seemed to
be egrerious.
other:
Avoid really cheap stuff. There's a reason it is cheap.
I wonder who much of the trouble is from the converter, and how much
of it is putting an antenna on your car 12V system. My converts are
on batteries (200Ah lead acid, solar float with genasun).
73 de n1dam
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