> From: RMcGraw@Blomand.net
> To: k9yc@arrl.net; tentec@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@audiosystemsgroup.com>
> To: <tentec@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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