"Rob" napisal w wiadomosci
...
Szczepan Bialek wrote:
Today, transmitters are often very small and still they work OK without
any earth connection.
How large should a "large conductor" be?

Adequate to electron emission.

Transmitters do not emit electrons.

"Negative corona take place at each voltage:
"A corona is a process by which a current, perhaps sustained, develops
between two high-potential electrodes in a neutral fluid, usually air, by
ionising that fluid so as to create a plasma around one electrode, and by
using the ions generated in plasma-processes as the charge carriers to the
other electrode.
Corona discharge usually involves two asymmetric electrodes, one highly
curved (such as the tip of a needle, or a narrow wire) and one of low
curvature (such as a plate, or the ground). The high curvature ensures a
high potential gradient around one electrode, for the generation of a
plasma.

Coronas may be positive, or negative. This is determined by the polarity of
the voltage on the highly-curved electrode. If the curved electrode is
positive with respect to the flat electrode we say we have a positive
corona, if negative we say we have a negative corona. The physics of
positive and negative coronas are strikingly different. This asymmetry is a
result of the great difference in mass between electrons and positively
charged ions, and so only the electron having the ability to undergo a
significant degree of ionising inelastic collision at common temperatures
and pressures.

An important reason for considering coronas is the production of ozone
around conductors undergoing corona processes. A negative corona generates
much more ozone than the corresponding positive corona. " From:
http://www.wordiq.com/definition/Corona_discharge

"the tip of a needle, or a narrow wire" is a source of the "cathode rays".
They were identyfied in 1895."


They emit electromagnetic waves.
You only see electric current in the feed to the antenna, not externally.

And what about the "displacement current?

When the antenna is not driven relative to earth, this is not causing
current into the earth, and so no connection to earth is required.

Probably it is the coax: "Many conventional coaxial cables use braided
copper wire forming the shield".

The transmitted signal flows only along the inside of the shield of the
coax. The outside is supposed to carry no signal. If it does, there is
a problem with the antenna system.

The outside is the "large conductor".

But in my cellphone, the coax feeding the antenna is maybe only 1cm
long, or even shorter. How can you call it a "large conductor"?

"Large enough."

I also belive in each Tesla's word. He discovered that in his secondary
coil
is the oscillatory electron flow from the earth into the air.
Why is it impossible?
S*

We do not operate our transmitters in the region where electrons start
flowing into the air, because we do not like arcing. Tesla did, but he
was in a different business.

Electron do not start.
Electrons are flowing into the air (and vacuum) at each voltage.
The thin wire is the best "cold cathode".

What current do you measure in a wire connected to your 12v car
battery, and hanging freely into the air?
This is the current caused by your electrons flowing into the air.

""the tip of a needle, or a narrow wire" is a source of the electrons.

For 12 V it should be the nanometers.

Take a rest.
S*