[RFI] Switchers ...

David Cole dave at nk7z.net
Sat Nov 15 00:53:20 EST 2014

The PDF must be read and understood to work correctly...
Thanks and 73's,
For equipment, and software setups and reviews see:
for MixW support see;
for Dopplergram information see:
for MM-SSTV see:

On Fri, 2014-11-14 at 21:56 -0600, Peter Laws wrote:
> On Fri, Nov 14, 2014 at 9:36 PM, Roger (K8RI) <k8ri at rogerhalstead.com> wrote:
> >
> >
> > That document covers many things from noise suppression to baluns.  On
> > 11/14/2014 10:21 PM, Peter Laws wrote:
> >
> > It's a PDF and a very good one.  Just type in a relevant phrase, or word and
> > you'll be there.  Start with RFI, or switching power supplies. That's where
> > I'd start, but the whole thing is a good read, full of useful information.
> >
> > I have the ARRL handbook, Antenna handbook, periodicals.  It's so easy to
> > find things in this format all I have to do is bring up the document of
> > interest, type what I want, and read.  It's not like lugging 15 to 20 pounds
> > of books and stacks of magazines, going through indexes and sorting
> > articles.
> >
> Go ahead.  Type my question into Acrobat:
> What is the best, generic solution for a wall wart or other switcher
> that is spewing trash from 500 kHz to 30000 kHz?
> OBVIOUSLY, that doesn't bring anything up.
> I have all those books and I have read about half of the PDF cited,
> but none of that answers my question.
> When someone asks "I've got one of those stupid switching supplies and
> it puts hash everywhere - what do I do?" (and for whatever reason,
> they can't replace it with a transformer), what is the answer?

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