"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*

"Jeff" napisal w wiadomosci
...

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*


As I said in one of my other posts: That does not describe a 'normal'
balanced dipole, which is fed at the centre. It is the description of a
very special case where a 1/2 wave length radiator is 'end-fed'. It is not
what people normally mean when the refer to a dipole, although it is a 1/2
wavelength radiator fed against ground

"Physic Principle An End Fed Half Wave Length Antenna is a variation of the
much more common half wave length dipole antenna. When an antenna that is
one half wave length long has RF energy applied to it at its resonant
frequency a standing wave develops on it."

The earth is connected at the node. "A node is a point along a standing wave
where the wave has minimal amplitude."

Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs the
ground?
S*

Szczepan Bialek wrote:
Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs the
ground?
S*

It does NOT require a ground to be functioning, assuming the energy is
coupled into the radiator using some other way than an end-feed.

Of course it would be stupid to erect an over 600m high mast and not
connect it to ground, but that is for reasons entirely unrelated to
its use as a transmitter antenna.

"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs
the
ground?
S*

It does NOT require a ground to be functioning, assuming the energy is
coupled into the radiator using some other way than an end-feed.

Of course it would be stupid to erect an over 600m high mast and not
connect it to ground, but that is for reasons entirely unrelated to
its use as a transmitter antenna.

So Marconi was not stupid.
S*

Szczepan Bialek wrote:

"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs
the
ground?
S*

It does NOT require a ground to be functioning, assuming the energy is
coupled into the radiator using some other way than an end-feed.

Of course it would be stupid to erect an over 600m high mast and not
connect it to ground, but that is for reasons entirely unrelated to
its use as a transmitter antenna.

So Marconi was not stupid.
S*

Marconi was wrong.

You are stupid. You cannot even grasp basic logic and reasoning.

When you read that a cow is an animal, you think that every animal
is a cow.

Szczepan Bialek wrote:

So Marconi was not stupid.

No, Marconi was not stupid, but he was wrong about some things because he
did not have all the information we now have 100 years later.

You, however, are very stupid.

"Jeff" napisal w wiadomosci
...


As I said in one of my other posts: That does not describe a 'normal'
balanced dipole, which is fed at the centre. It is the description of a
very special case where a 1/2 wave length radiator is 'end-fed'. It is
not
what people normally mean when the refer to a dipole, although it is a
1/2
wavelength radiator fed against ground

"Physic Principle An End Fed Half Wave Length Antenna is a variation of
the
much more common half wave length dipole antenna. When an antenna that is
one half wave length long has RF energy applied to it at its resonant
frequency a standing wave develops on it."

The earth is connected at the node. "A node is a point along a standing
wave
where the wave has minimal amplitude."

Does ""Large constructed half-wavelength dipole towers include the Warsaw
radio mast - the only half-wave dipole for longwave ever built." needs
the
ground?
S*

No, the 1/2 wave radiator does not need a ground, however, because of the
way they chose to feed the 1/2 wave, the feed system does. If they had
chosen the insulate the tower half way up and feed it there no earth would
have been required at all.

The tower insulated half way up and feed there are the two monoples.
It is the array.
But such are in form of the two monopole mast 1/4 wave apart.

Will be better to end the discussion.
S*

Szczepan Bialek wrote:
Will be better to end the discussion.
S*

Would be even better when you did not start the discussion.
Remember that for next time.