Impervious, like 100% perfect?
wow
> On Aug 4, 2016, at 10:13 AM, Joe <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://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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>>
>>
>
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