Not a new problem for hams. For most of a century consumer stuff had poor to
nonexistent RFI compatibility... And if the equipment itself wasn't so bad, it
was connected with huge loops of wires that made the installation susceptible.
Adding a few bypass capacitors and helping the consumer use decent differential
wiring has been part of the solution since at least the 1930's handbooks.
Except today we are more often worried about radiation and not susceptibility
of consumer stuff.
Tim N3QE
----- Original Message -----
From: Jim Brown [mailto:jim@audiosystemsgroup.com]
Sent: Sunday, July 21, 2013 08:37 PM
To: topband@contesting.com <topband@contesting.com>
Subject: Re: Topband: Desktop Power Supply Brand/Noise Question
On 7/21/2013 4:52 PM, Tom W8JI wrote:
>
> Bypass capacitors will cure common mode also, because common mode
> cannot be generated without differential mode someplace in the system
> between two points.
But you're re-engineering someone else's design, without knowledge of
all the issues.That's a questionable practice unless you're a circuit
designer -- it's easy to open a can of worms. Few hams are qualified to
do that, and I would be the last to recommend it.
73, Jim K9YC
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