Your question is far too non-specific to have merit. The generic answer to
"what do you replace a noisy switer with" - is a linear supply.
It's too heavy. It's too inefficient. It's too big. Well, that' gets you
into a more nuanced question - and the answers are more nuanced.
Switching power supplies, properly designed, can be RFI quiet. And a noisy
PS can be quieted down for the most part but it may take serious work,
serious money and serious time.
There are a lot of variables in the subject. Which is part of the reason
Jim's document is big. If you want an easy answer, buy a linear PS for
every switcher that gives you problems. In the same way that a Chevette
will let you drive from NYC to LA, it will do the job although you may not
like the ride.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: David Cole
Sent: Friday, November 14, 2014 11:53 PM
To: rfi@contesting.com
Subject: Re: [RFI] Switchers ...
The PDF must be read and understood to work correctly...
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info
On Fri, 2014-11-14 at 21:56 -0600, Peter Laws wrote:
On Fri, Nov 14, 2014 at 9:36 PM, Roger (K8RI) <k8ri@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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