Topband: Desktop Power Supply Brand/Noise Question

[Shoppa, Tim]

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 at audiosystemsgroup.com]
Sent: Sunday, July 21, 2013 08:37 PM
To: topband at contesting.com <topband at 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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Topband Reflector