[RFI] Switchers ...

dalej dj2001x at comcast.net
Sat Nov 15 04:30:58 EST 2014

I have found in at least one case in my own house, that wrapping the cable that plugs into the device the WW is powering, with a #31 mix snap-on.  Several turns reduced the trash, but not eliminated entirely.  Maybe wrapping a couple more would reduce it further, but then there would be no cord left. 

Perhaps cutting the thing open and adding components to reduce trash level would be one solution too, but it might also destroy it, so no good answer is the answer for these things.  

They should be banned from store shelves until the mfg can demonstrate they are clean, just like a lot of  other polluting devices the government bans and will be banning in the future, gas burning lawn mower for example.  

GL and 73
Dale, k9vuj

On 14, Nov 2014, at 21:56, Peter Laws <plaws0 at gmail.com> 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?
> -- 
> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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