[TowerTalk] Wireless Internet RFI

[Roger]

On 7/30/2013 2:39 AM, Jim Brown wrote:
> On 7/29/2013 10:07 AM, Brian Sarkisian wrote:
>> Any help would be appreciated.
>
> In addition to the advice that both W8JI and I have offered about
> switching power supplies, don't overlook radiation from, and reception
> by, the telephone line. This mechanism is greatly increased when the
> telephone cable utilizes parallel conductors rather than twisted pair,
> and is interference is considerably reduced when the the twisted pair
> has a very high twist ratio (more twists per inch) and a more uniform
> twist.
>
> For more than a century, telegraph and telephone wiring VERY effectively
> used twisted pair to reject interference, but the bean counters took
> over, and local wiring now uses a lot of parallel wire cables (because
> they are cheaper). In ALL cases of interference involving telephone
> systems, one of the first moves should be to replace parallel wire
> cables with CAT5/6/7 cables, ALWAYS dedicating a pair per circuit. In
> CAT5/6/7 cables, Blue and Blue/White is a pair, Or and Or/Wh is a pair,
> and so on.  Most of this wiring belongs to the telephone carrier, and it
> is THEIR RESPONSIBILITY to make this replacement.

But the telephone company only will come inside if they find what they 
consider a problem inside.  They had a shorted line inside the house. 
(cat had chewed the end of a non terminated line. Cost me $50)
<snip>

>
> 73, Jim K9YC
> Still working on solving the root cause of problems :)
>
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