[RFI] FW: Quiet Switching Power Supply?

[Joe]

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://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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