[HCDX]: Re: Noise from power lines

["Glen H. Kippel" <gk-dx@xxxxxxxx>]

On Fri, 19 Feb 1999 10:52:49 -0500 jerry.monroe@xxxxxxxxxxxxxxxxxxxxx
writes:
>
>
>re: I live about 400 meters from two 400 kV power supply lines
>
>Bjarke,
>400 KV lines are serious stuff, I have had good luck with my local 
>power
>company and RF leakage team in finding and repairing local "noisy" 
>power
>lines.
>
>It is a concern to them, as it points to possible  problems in the 
>future
>(i.e. cracked insulators,etc.).
>
>But 400,000 volt power lines are a different matter, even if their "hf
>noise" is down 100 decibals the noise emitted is still many volts 
>running
>down their "suspended long wires" !
>
>If the Power Company folks say all is in order,  than I would suggest 
>,
>perhaps phasing two antennas to put a null in the direction of the 
>power
>lines (MFJ has a box for this), or perhaps use low frequency loop 
>antennas
>(major nulling antennas) of which they're are plenty of do-it-yourself
>projects out there for you to try.
>
>good luck,
>
>Jerry (central NY)
>
>
Jerry, I doubt the efficacy of this, as it is possible to null a point
source easily enough -- but the noise generator he is describing is many
miles long.  It may be possible to use a Beverage antenna aimed away from
the power lines, but that would make it possible to receive only stations
located in a specific area of the world.  I would suggest a balanced,
shielded loop antenna as the best way to reject the E-field from the
lines.  I used to live close to some 67-kV lines and did pretty well with
unbalanced, shielded co-ax loops.

Glen Kippel
KF6LXI

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