Anyone know where I can find plans for an artificial ground?
 

Szczepan Bialek wrote:
The radial connected with the shield of the coax is the ground.

No Szczepan!
You keep saying that, but it is wrong.

When a coax shield is grounded at one end, and after a considerable
length of coax it is connected at the dipole, the shield at that
end is no longer ground.

Especially when the length of the coax is about a quarter wavelength,
it will have nothing to do with ground.

Anyone know where I can find plans for an artificial ground?
 

Szczepan Bialek wrote:

The radial connected with the shield of the coax is the ground.

What coax?

The first dipole was the Hertz dipole. The both legs were fed with the same
frequency but not in phase. The both ends radiate with the same intensity.
The Marconi antenna has only one radiated leg. It is almost in the free
space (masts are high).

Babbling gibberish.

The horizontal dipole radiate in one horizontal direction only. The vertical
in all horizontal directions. But the mast must be very high.
The horizontal, vertical or tilted monopole radiate in all directions. Your
cell phone has the monopole.

More babbling gibberish.


--
Jim Pennino

Anyone know where I can find plans for an artificial ground?
 

U¿ytkownik "Rob" napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:
The radial connected with the shield of the coax is the ground.

No Szczepan!
You keep saying that, but it is wrong.

Not me but Wiki:
"The monopole antenna was invented in 1895 by radio pioneer Guglielmo
Marconi, who discovered if he attached one terminal of his transmitter to a
wire suspended in the air and the other to the Earth, he could transmit for
longer distances. For this reason it is sometimes called a Marconi antenna.
Common types of monopole antenna are the whip, rubber ducky, helical, random
wire, inverted-L and T-antenna, mast radiator, and ground plane antennas."

When a coax shield is grounded at one end, and after a considerable
length of coax it is connected at the dipole, the shield at that
end is no longer ground.

Especially when the length of the coax is about a quarter wavelength,
it will have nothing to do with ground.

The "ground plane antenna" is also the monopole:
"To function as a ground plane, the conducting surface must be at least a
quarter of the wavelength (?/4) of the radio waves in size. In lower
frequency antennas, such as the mast radiators used for broadcast antennas,
the Earth itself (or a body of water such as a salt marsh or ocean) is used
as a ground plane. For higher frequency antennas, in the VHF or UHF range,
the ground plane can be smaller, and metal disks, screens or wires are used
as ground planes".

For radioamateurs the one wire is enough.
The dipole is useless for them. They want to "transmit for longer
distances".

But some radioameteurs use the receiving dipole to find the source of
radiation.
S*

Anyone know where I can find plans for an artificial ground?
 

Szczepan Bialek wrote:
The "ground plane antenna" is also the monopole:
"To function as a ground plane, the conducting surface must be at least a
quarter of the wavelength (?/4) of the radio waves in size. In lower
frequency antennas, such as the mast radiators used for broadcast antennas,
the Earth itself (or a body of water such as a salt marsh or ocean) is used
as a ground plane. For higher frequency antennas, in the VHF or UHF range,
the ground plane can be smaller, and metal disks, screens or wires are used
as ground planes".

Note that it does not say that it is sufficient to connect one side
of the antenna to the ground with a wire.
A ground plane is something different than a wire to ground.

Anyone know where I can find plans for an artificial ground?
 

"Szczepan Bialek" wrote in message
...
Not me but Wiki:
"The monopole antenna was invented ...
For radioamateurs the one wire is enough. The dipole is useless for them.
They want to "transmit for longer distances".

S*
Hello old chap.

There is surely no point in posting quotations from Wiki if you do not
understand them.
The comment about dipoles being useless for amateurs is definitely
incorrect. The dipole is a very popular design of antenna for amateur radio
use.

Regards, Rog.

Anyone know where I can find plans for an artificial ground?
 

"Szczepan Bialek" wrote in message
...
Not me but Wiki:
"The monopole antenna was invented ...
For radioamateurs the one wire is enough. The dipole is useless for them.
They want to "transmit for longer distances".

S*

Hello old chap.

There is surely no point in posting quotations from Wiki if you do not
understand them.
The comment about dipoles being useless for amateurs is definitely
incorrect. The dipole is a very popular design of antenna for amateur radio
use.

Regards, Ian.

Anyone know where I can find plans for an artificial ground?
 

"Szczepan Bialek" wrote in message
.. .


"Wayne" napisal w wiadomosci
...


"Szczepan Bialek" wrote in message
...


On Friday, April 26, 2013 12:38:06 PM UTC-5, Irv Finkleman wrote:
snip

Maybe SB can explain the difference between a monopole with a single
ungrounded radial, and a dipole.

Each radial, grounded or not (but connected to the shield of the coax),
is the ground.
The Earth, the Moon, a satelite and each piece of conductor is ground for
antennas. Radial is one of them.
Ground must be adequate to kW.

What if the single ungrounded quarter wave radial is in line with the
quarter wave radiator?
Is it still a monopole?

# Of course.

Wow...you gave a lot to digest.

Just to understand the discussion, let's address the monopole with one
radial.

Assuming the monopole is 1/4 wave long, and has a 1/4 wave long radial.
The radial is in line with the monopole. Everything is ungrounded.

# The radial connected with the shield of the coax is the ground.


How does that configuration of a monopole with one radial differ from a
dipole?

So a half wave wire broken at the center is a monopole with a single radial
if it is fed directly with coax?
And it is a dipole if it has a balanced feed?

What if the coax feedline has a quarter wave sleeve, open at the antenna but
connected to the coax at the other end?
Is it a monopole or a dipole?

Anyone know where I can find plans for an artificial ground?
 

Szczepan Bialek wrote:

U?ytkownik "Rob" napisa? w wiadomo?ci
...
Szczepan Bialek wrote:
The radial connected with the shield of the coax is the ground.

No Szczepan!
You keep saying that, but it is wrong.

Not me but Wiki:
"The monopole antenna was invented in 1895 by radio pioneer Guglielmo
Marconi, who discovered if he attached one terminal of his transmitter to a
wire suspended in the air and the other to the Earth, he could transmit for
longer distances. For this reason it is sometimes called a Marconi antenna.
Common types of monopole antenna are the whip, rubber ducky, helical, random
wire, inverted-L and T-antenna, mast radiator, and ground plane antennas."

This is true but you have no clue what it means as demonstrated by your
babbling gibberish.

When a coax shield is grounded at one end, and after a considerable
length of coax it is connected at the dipole, the shield at that
end is no longer ground.

Especially when the length of the coax is about a quarter wavelength,
it will have nothing to do with ground.

The "ground plane antenna" is also the monopole:
"To function as a ground plane, the conducting surface must be at least a
quarter of the wavelength (?/4) of the radio waves in size. In lower
frequency antennas, such as the mast radiators used for broadcast antennas,
the Earth itself (or a body of water such as a salt marsh or ocean) is used
as a ground plane. For higher frequency antennas, in the VHF or UHF range,
the ground plane can be smaller, and metal disks, screens or wires are used
as ground planes".

This is true but you have no clue what it means as demonstrated by your
babbling gibberish.

For radioamateurs the one wire is enough.
The dipole is useless for them. They want to "transmit for longer
distances".

But some radioameteurs use the receiving dipole to find the source of
radiation.
S*

And all your comments are again babbling gibberish that shows you have
absolutely no understanding of anything you have read.


--
Jim Pennino

Anyone know where I can find plans for an artificial ground?
 

On 4/29/2013 3:50 AM, Szczepan Bialek wrote:
"Wayne" napisal w wiadomosci
Assuming the monopole is 1/4 wave long, and has a 1/4 wave long radial.
The radial is in line with the monopole. Everything is ungrounded.

The radial connected with the shield of the coax is the ground.

So what would happen if I connected my transmitter, which has a 50 ohm
{ostensibly) output with the hot lead of the coax connected to the
"radial" instead of the "monopole" and similarly with the braid?

Think long about this.

tom
K0TAR

Anyone know where I can find plans for an artificial ground?
 

On 4/29/2013 10:20 PM, tom wrote:
On 4/29/2013 3:50 AM, Szczepan Bialek wrote:
"Wayne" napisal w wiadomosci
Assuming the monopole is 1/4 wave long, and has a 1/4 wave long radial.
The radial is in line with the monopole. Everything is ungrounded.

The radial connected with the shield of the coax is the ground.

So what would happen if I connected my transmitter, which has a 50 ohm
{ostensibly) output with the hot lead of the coax connected to the
"radial" instead of the "monopole" and similarly with the braid?

Think long about this.

tom
K0TAR




Just to clearly understand where you are on how this really works.

tom
K0TAR