Re: [RFI] FW: Quiet Switching Power Supply?

[Joe <nss@mwt.net>]

as close to coax as any normal amateur would never know the difference. 
but ONLY if installed correctly!
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 8/4/2016 9:16 AM, myles Landstein wrote:
> Impervious, like 100% perfect?
>
> wow
>
>
>
>
>
> > On Aug 4, 2016, at 10:13 AM, Joe <nss@mwt.net <mailto:nss@mwt.net>> 
> > wrote:
> > if the open line is installed correctly, it is just as impervious to 
> > noise as any coax. it is self shielding. but it must be installed 
> > correctly.
> > Joe WB9SBD
> > Sig
> > The Original Rolling Ball Clock
> > Idle Tyme
> > Idle-Tyme.com <http://idle-tyme.com>
> > http://www.idle-tyme.com
> > On 8/4/2016 8:51 AM, Paul Christensen wrote:
> > > > "Unless you're in a screen room or 100 miles from civilization, the
> > > background noise is going to cover up any minuscule noise that the best
> > > switchers for ham use are going to emit. "
> > >
> > > Dale, that's probably true when using coaxial lines and resonant 
> > > antennas
> > > but all switching supplies emit RFI - some more or less than others.
> > >
> > > When using open feeders that run across the length of a home, any small
> > > amount of RFI can be detected, including RFI emitted from the best ham
> > > switching supplies.  On receive, balanced feeders cannot cancel all 
> > > noise
> > > sources, since the arrival angle to the line is inconsistent.
> > > Trans-positioning the line may sometimes help.
> > >
> > > At my home QTH, coax is run through the house to feed a motorized,
> > > symmetrical  balanced tuner that's located outside and away from 
> > > home RFI
> > > sources.  Problem solved but it requires an extra level of cost and
> > > complexity.
> > >
> > > Just my opinion, but for ladder line/open feeder runs through a house or
> > > apartment, I would stick with linear supplies and linear wall-warts for
> > > accessories.
> > >
> > > Paul, W9AC
> > >
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