[TenTec] On Switching Power Supplies

[PC Anderson]

> From: RMcGraw at Blomand.net
> To: k9yc at arrl.net; tentec at contesting.com
> Date: Sat, 18 Jan 2014 09:28:29 -0600
> Subject: Re: [TenTec] On Switching Power Supplies
> 
> I've found a very few linear power supplies generate noise.  However those 
> that do I've found are largely due to deteriorating decoupling capacitors in 
> the regulator circuit or due to a highly reactive load on the output. 
> Typically the oscillation can be from a few Hz to over 100 KHz and equal in 
> amplitude to the output voltage.  Real nasty stuff.
> 
> A well designed and manufactured power supply, be it linear or switcher, 
> will not generate any objectionable noise.   Any noise generated has been 
> found to be several dB below the typical noise found on the HF bands and 
> even VHF bands.
> 
> 
> 
> 73
> Bob, K4TAX
> 
> 
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Jim Brown" <k9yc at audiosystemsgroup.com>
> To: <tentec at contesting.com>
> Sent: Saturday, January 18, 2014 12:21 AM
> 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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> 
> 
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