The earth
 

Szczepan Bialek wrote:
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*

It says "for AM broadcasters", not "for every transmitter".

Your conclusion that anything applying to a low frequency transmitter
for which it is impractical to build a balanced resonating antenna
applies to all transmitters in the universe is just wrong.

The earth
 

"Szczepan Bialek" wrote in message
...

Is it necessary to "get the static to bypass my receiver".

Hello Szczepan.

No, it is not necessary to ge the static to bypass a receiver.


For me is enough to know "Is it the ground/chassis/counterpoise necessary
to "get the static to bypass a transmitter/receiver".?
I hope that some of you know the answer.

Same answer. It is not necessary ...

Kindest regards, Ian.

The earth
 

"Szczepan Bialek" wrote in message
...
http://en.wikipedia.org/wiki/Dipole_antenna

See: http://en.wikipedia.org/wiki/File:Di..._in_meters.png

http://en.wikipedia.org/wiki/Monopole_antenna

"One side of the antenna feedline is attached to the lower end of the
monopole, and the other side is attached to the ground plane, which is
often the Earth.

This contrasts with a dipole antennawhich consists of two identical rod
conductors, with the signal from the transmitter applied between the two
halves of the antenna.

Any comments?
Best Regards,
S*

Hello Szczepan .
Dipole has two pieces of metal.
Monopole has one piece of metal.
Connecting a dipole to ground doesn't remove one piece of metal.

Best wishes, Ian.

The earth
 

"Szczepan Bialek" wrote in message
...

" For clarification - radios can and do transmit and receive
successfully
without any connection to earth, either the actual ground or to an
artificial earth.

And what do you do with the static build up?
Best Regards,
S*
Hello Szczepan.

Static build up doesn't always happen.

Regards, Ian.

The earth
 

"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
"One side of the antenna feedline is attached to the lower end of the
monopole, and the other side is attached to the ground plane, which is
often
the Earth.

This contrasts with a dipole antennawhich consists of two identical rod
conductors, with the signal from the transmitter applied between the two
halves of the antenna.

Any comments?
Best Regards,
S*

Now you have written it yourself! With a dipole antenna you do not
need an earth connection because the signal is applied between the
two halves of the antenna, not between earth and the antenna.

Real dipole needs:
"In the lower half of the mast, there was a vertical steel tube, attached to
the mast's outer structure with large insulators. This tube was grounded at
the bottom, and connected electrically to the mast structure by an
adjustable metal bar at 328 metres.[2] This technique allowed adjusting the
impedance of the mast for the transmitter and worked by applying a DC ground
at a point of low radiofrequency voltage, to conduct static charge to ground
without diminishing the radio energy. Static electrical charge can build up
to high values, even at times of no thunderstorm activity, when such tall
structures are insulated from ground. Use of this technique provides better
lightning protection than using just a spark gap at the mast feed, as is
standard at most mast radiators insulated against ground."
From: http://en.wikipedia.org/wiki/Warsaw_radio_tower

End of discussion.
S*

The earth
 

"Szczepan Bialek" wrote in message
.. .
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*

Hello again Szczepan
The answer to your question is in that Wikipedia article. Read the
"Radiation Pattern" paragraph.

If you can get ham radio textbooks in your country then you'd understand a
lot better by reading a textbook on aerials.
Try http://www.rsgbshop.org/acatalog/Onl...tennas_37.html
and www.arrl.org/shop/Antennas/

I haven't seen an answer from you to my question which asked:
"Are you discussing resonant or non-resonant aerials, please?"

Best wishes, Ian.

The earth
 

"Szczepan Bialek" wrote in message
...

Real dipole needs:
"In the lower half of the mast, there was a vertical steel tube, attached
to the mast's outer structure with large insulators. This tube was
grounded at the bottom, and connected electrically to the mast structure
by an adjustable metal bar at 328 metres.[2] This technique allowed
adjusting the impedance of the mast for the transmitter and worked by
applying a DC ground at a point of low radiofrequency voltage, to conduct
static charge to ground without diminishing the radio energy. Static
electrical charge can build up to high values, even at times of no
thunderstorm activity, when such tall structures are insulated from
ground. Use of this technique provides better lightning protection than
using just a spark gap at the mast feed, as is standard at most mast
radiators insulated against ground."
From: http://en.wikipedia.org/wiki/Warsaw_radio_tower

End of discussion.
S*
Good evening Szczepan.

The Warsaw radio mast was not a dipole.

May I remind you that I would appreciate an answer to my question "Are you
discussing resonant or non-resonant aerials, please?". It would help to
clarify what you have in mind,

Kindest regards;
have a good evening,
Ian.

The earth
 

Szczepan Bialek wrote:

"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
"One side of the antenna feedline is attached to the lower end of the
monopole, and the other side is attached to the ground plane, which is
often
the Earth.

This contrasts with a dipole antennawhich consists of two identical rod
conductors, with the signal from the transmitter applied between the two
halves of the antenna.

Any comments?
Best Regards,
S*

Now you have written it yourself! With a dipole antenna you do not
need an earth connection because the signal is applied between the
two halves of the antenna, not between earth and the antenna.

Real dipole needs:

That is not a dipole. It is a vertical half-wave radiator. It is
not center fed like you discussed above.

The earth
 

Szczepan Bialek wrote:

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

Because they are talking specifically about a vertical, monopole antenna
mounted on the ground and fed at the base end.

They are NOT talking about antennas in general.

They are NOT talking about transmitters.

Tell them that they are WRONG.
S*

They are not wrong, you are just too stupid to understand what they ARE
talking about.

The earth
 

"Szczepan Bialek" wrote in message
.. .


"Jeff" napisal w wiadomosci
...
On 15/04/2012 10:33, Szczepan Bialek wrote:
Uzytkownik napisal w wiadomosci
...
On 15/04/2012 09:58, Szczepan Bialek wrote:

But you wrote that your radio have the earth/chassis.

The point that you are missing is that the earth connection has
NOTHING
to do with transmitting or receiving a signal. If is merely there for
safety in the event of a lightening strike or build up or static.

So the radio have the earth/chassis.

Ian's equipment will work no differently is the earth connection is
disconnected. Marconi was WRONG!!!!

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*

Looks like you are either a troll or being deliberately dense. Reminds me
of the mechanical engineer guy on the group a while back who was making
fantastic claims for miniscule antennas.

At any rate:
PLONK ..._._