little billy said:
This does not make any sense at all. Everyone here
says that the the requency is 50 Hz. I know the
electricity works at 50 Hz, this does not mean that
the electromagnetic waves of high power cable lines
are 50 Hz. For example, whenever I drive near high
voltage lines my am radio goes all haywire. This means
that at least some of the radiation is at 100 - 1600
KILO Hertz. I can't believe someone suggested to build
a 5000 km antenna to test these waves, I assume he was
making some sort of joke of my question. Obviously, any
detector should be smart enough to use a detection
method which doesn't involve builing a 5000 km antenna.
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A major couse of RF interference from power lines is due to corona
discharges due to high fields near the conductors. Broad frequency noise
from audio to TV frequencies can occur. Sometimes it is due to corona
discharges at points such as the ends of tie wires on insulators, sometimes
loose connections on hardware in regions of high field intensity, sometimes
due to contamination on insulator surfaces. Often low voltage (33KV or so)
lines are worse than EHV (330KV or more) are worse culprits (sharp points).
On High voltage lines, contamination of insulators, nicks or crap on the
conductors, etc are more prevalent.
In areas where this is a problem, the utility is (or should be) responsible
for reduction/mitigation of the problem.
Normal 50/60 Hz will not be a problem. Harmonics of 50/60 Hz that may exist
will also not be a problem. (25th harmonic of 60 Hz is at 1500Hz and will be
extremely small as well as not being in the "RF" range).