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SWL/RFI noise source discovery

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November 17th 03, 02:04 AM

Herbert West

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On 16 Nov 2003 15:58:33 -0800, (Marc A. Murison)
wrote:

I just discovered the same thing yesterday: both my cell phone charger
and my Rigid cordless drill charger spew incredible amounts of RFI. I
suspect today's "smart" chargers are almost all big RFI emitters.
Ditto my laptop AC power coverter!

Damn cheap, poorly designed switching power supplies! I replace them
with analog supplies rated the same or higher current. Analog
float-chargers aren't that hard to build, either.

"brass eyelets" wrote:
After looking for 2 weeks for the source of
noise that was producing an s-5 noise from
3 to 8 MHz on the dial of my older Icom I
found the source. My Dewalt cordless drill
drop-in battery charger. Apparently this charger
uses a rather harmonic-rich power supply and
charging circuit. Remove the battery and unplug
the charger and the noise disappears. Any of
you having a Dewalt cordless drop in may want
to check this also.

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