[TenTec] On Switching Power Supplies

[Rick - DJ0IP / NJ0IP]

And even the oscillations are often caused by grounding issues!

If the regulator's ground connection is not VERY short and identical with
the ground of the electrolytic capacitors, oscillation can occur, especially
with varying loads such as SSB transmission - but these are usually
oscillations at VHF frequencies, which normally should not cause disturbance
to the HF receiver.  And as Jim says, that was poor design.

I don't see how a well designed linear power supply that is working properly
can cause any disturbance to an hf receiver except for AC hum.

Have I missed something.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Saturday, January 18, 2014 7:21 AM
To: tentec at contesting.com
Subject: Re: [TenTec] On Switching Power Supplies

On 1/17/2014 3:44 PM, george fritkin wrote:
> linear power supplies can cause noise a very proven fact

Perhaps you could tell us the mechanism.  I can think of only two --
oscillation in a regulator circuit, and improper termination of ground
wiring.  The latter has nothing to do with power supplies, and the former is
another engineering goof. .

73, Jim K9YC
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