[IRCA] Chasing RFI from URD lines.

[Charles A Taylor <MWDXer@xxxxxxx>]

At 07:40 PM 2/17/2007 -0500, you wrote:
>Speaking of electricity...
>
>We have buried power lines here in our subdivision. I don't know how far
>down they are, but I know where they are. My question is...how big is the
>electrical field the buried line emits? Could I put an antenna over it or
>near it? Does anyone know? Thanks for the help.
>
>Bert New
>Watkinsville, Georgia
>Proudly Serving You Since 1964!


Bert,

I'd like to know how you've been serving me since 1964. Matter of fact, 
ain't done NOTHING for me that I know
of.

Hi.

AS to the buried power lines, it seems to me they are a whole sight quieter 
RFI-wise than the overhead variety.

One thing, they are still going to convey RFI house-to-house as they do 
now. That they are buried implies that
they won't radiate nearly as much overheads do.

Generally, either way, a single stepdown transformer serves 4-6 residences 
at 120/240 V. A lot of the worse
RFI comes from nearby residences via 120/240V. An underground line tends to 
have this filtered off by
capacitance to earth.

The RFI generated by the high side of overhead lines (generally 12..5 or 23 
kV) tends to be very much quieted
by URD (underground residential distribution). That is a real blessing.

All you have to do is sweep the vicinity of the underground line with a 
portable radio to determine how much
RFI it's emitting.

An antenna erected or buried at right angles to such underground lines 
would tend to pick up less RFI from
them than one that runs parallel to them.

Sergeant New, you are directed to chase down RFI from your nearby 
underground power and report back to
Squadron (IRCA) what you observe.

Captain Taylor



        -----
Charles A Taylor, WD4INP
Greenville, North Carolina 


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