Standing waves
 

U¿ytkownik "Dave" napisa³ w wiadomo¶ci
...

"Szczepan Bialek" wrote in message
...

I have onmy shelf the Fluid dynamics by Dr Ludwig Prandtl. Prandtl is a
big name.
S*
maybe in fluid dynamics, but not in electromagnetics.

In each textbook on electromagnetics is wrote that the math is the same like
in fluid dynamics and in each textbook on fluid mechanism is wrote that the
math is the same as in electromagnetism. The same teache teach them. Do not
you know that?
Even famous Pointing vector was born in fluids by Umov.
S*

Standing waves
 

"K7ITM" wrote
...
On Sep 17, 11:59 pm, Szczepan Bia³ek wrote:
"K7ITM"
...
....
reasonably simple terms. One of the best I know is Joseph Boyer's
pair of articles from May and June, I think it was, 1978 "Ham Radio"
magazine: "The Antenna-Transmission Line Analog." It's a non-
mathematical work; it will leave you with answers with not a lot to
back them up, but they do match what we observe, as far as I
understand it. I have these as a PDF, along with a fairly important
section from a book referenced by the articles.

You send me to library. ...

No, actually I told you that I have the article plus one of the
important references as a PDF [file]. It's certainly not worth my
effort or the net bandwidth for me to try to repeat what that article
has already done a good job with. Also, I gather from some of the
postings in this thread that you're more interested in arguing and
being negative than in reading such an article.

I have used "library" many times in my posts in meaning "read something". I
am here to collect the arguments that EM is useless. So I am interested only
in troubles in explanation of antennas behaviour. You should agree that now
we should analize the behaviour of electrons in antennas. The first antenna
(Hertz experiment) was made before discovery of electrons. But electronic
oscillators use electrons which travel in vacuume . They have the charge and
the mass. In antennas are the same.
S*

Standing waves
 

On Sep 24, 2:35*am, Szczepan Bia³ek wrote:

I am here to collect the arguments that EM is useless. So I am interested
only in troubles in explanation of antennas behaviour.

Suggest that you gather, study and accurately evaluate all such
relevant information before you decide whether or not "EM is useless."

RF

Standing waves
 

Szczepan Bia³ek wrote:
Even famous Pointing vector was born in fluids by Umov.

It's "Poynting" vector, named after John Henry Poynting.

http://en.wikipedia.org/wiki/Poynting_vector
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com

Standing waves
 

Szczepan Białek wrote:

I am here to collect the arguments that EM is useless. So I am interested only
in troubles in explanation of antennas behaviour.

Any "troubles in explanation of antennas behaviour" are due to lack of
education.


--
Jim Pennino

Remove .spam.sux to reply.

Standing waves
 

"Richard Fry" wrote

On Sep 24, 2:35 am, Szczepan Bia³ek wrote:

I am here to collect the arguments that EM is useless. So I am interested
only in troubles in explanation of antennas behaviour.

Suggest that you gather, study and accurately evaluate all such
relevant information before you decide whether or not "EM is useless."

Maxwell was the genius Such are almost always right. He assumed that
electricity is the incompressible massless fluid. But up to now nobody has
isolated the pure electricity. We use only the charged bodies. The electrons
are also like charged bodies. They have mass. EM was made for space. We here
analyse the electrons in the conductors. If electrons are not a pure
electricity when the EM is useless for conductors. Maxwell wrote the
"Treatise on electricity and magnetism" not "Electrodynamics of charged
bodies".
It seems that EM is useless for antennas. I do not know what is in space.
May be that there EM is usefull.
How do you see it?
S*

Standing waves
 

Szczepan Białek wrote:

Maxwell was the genius Such are almost always right. He assumed that
electricity is the incompressible massless fluid. But up to now nobody has
isolated the pure electricity. We use only the charged bodies. The electrons
are also like charged bodies. They have mass. EM was made for space. We here
analyse the electrons in the conductors. If electrons are not a pure
electricity when the EM is useless for conductors. Maxwell wrote the
"Treatise on electricity and magnetism" not "Electrodynamics of charged
bodies".
It seems that EM is useless for antennas. I do not know what is in space.
May be that there EM is usefull.
How do you see it?
S*

That everything you post is childish gibberish.


--
Jim Pennino

Remove .spam.sux to reply.

Standing waves
 

"Cecil Moore" wrote
...
Szczepan Bia³ek wrote:
Even famous Pointing vector was born in fluids by Umov.

It's "Poynting" vector, named after John Henry Poynting.

http://en.wikipedia.org/wiki/Poynting_vector
"The Umov-Poynting vector[6] discovered by Nikolay Umov in 1874 describes
energy flux in liquid and elastic media in a completely generalized view."

Poynting "discovered" it in 1884.
"He was the developer and eponym of the Poynting vector, which describes the
direction and magnitude of electromagnetic energy flow and is used in the
Poynting theorem, a statement about energy conservation for electric and
magnetic fields. This work was first published in 1884. "

The same is with Maxwell math. Helmholtz wrote such for his whirls.
Many people are thinking in the same time about the same think.
I am not alone in the "Acoustic analogy".
S*

Standing waves
 

Szczepan Bia³ek wrote:
It seems that EM is useless for antennas. I do not know what is in
space. May be that there EM is usefull.

EM (photonic) waves travel at the speed of light in the medium.
EM (photonic) waves do not travel inside conductors. EM (photonic)
waves travel in space near to the surface of a conductor. For an
HF wire antenna, the photonic waves travel in the space surrounding
the wire and some is radiated. For a wire transmission line, the
fields of the photonic waves tend to cancel and not much is radiated.
For a wave guide, the photonic waves travel in the space on the
inside of the wave guide and very little energy escapes the conductive
sides of the wave guide.

The purpose of using a conductor with free electrons is that the
free electrons are capable of emitting EM waves in the form of
photons.

1. Without the photons, there would be no radiation.

2. Without the free electrons, there would be no photons.

3. Without the metal conductor, there would be no free electrons.

It is a very simple cause and effect chain from the aluminum or
copper antenna to the release of photons as radiation. I think
my 12 year old grandson could understand the principles involved.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com

Standing waves
 

Szczepan Bia³ek wrote:

"Cecil Moore" wrote

Szczepan Bia³ek wrote:
Even famous Pointing vector was born in fluids by Umov.

It's "Poynting" vector, named after John Henry Poynting.

Poynting "discovered" it in 1884.

You completely missed the "Poynt". See above. :-)
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com