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Old April 16th 12, 09:29 AM posted to rec.radio.amateur.antenna
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Posts: 707
Default The earth


"Jeff" napisal w wiadomosci
...

And what about your equipment?
Is the earth connection disconnected?
S*



I have no earth connection, so it cannot be connected or disconnected.


Why than: "The ideal ground system forAM broadcasters comprises at least
120
buried copper or phosphor bronze radial wires at least one-quarter
wavelength long and a ground-screen in the immediate vicinity of the
tower.
All the ground system components are bonded together, usually by welding,
brazing or using coin silversolder to help reduce corrosion". From:
http://en.wikipedia.org/wiki/Monopole_antenna

Tell them that they are WRONG.
S*



They are not wrong a such; your quote is about "AM broadcasters", which is
normally (and incorrectly) meant to mean 'long & medium Wave'
broadcasters. Because for the long wavelengths involved many such
broadcasters choose to use vertical monopoles for antennas, and for those
monopoles to work efficiently they do indeed require a good ground system.
(These were the systems that Marconi was referring to).

If there is sufficient space a dipole could be used which would *NOT*
require the ground system.

That in Warsaw required the ground system:
""Large constructed half-wavelength dipole towers include the Warsaw radio
mast - the only half-wave dipole for longwave ever built."

S*


 
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