Szczepan Bialek wrote:

Is the field electron emission from the tip top of antenna or not?

No.

Read this:

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

Read all of it.

Then read it again until you understand it.

After you have mastered that, read this:

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

Read all of it.

Then read it again until you understand it.

After you have mastered that, read this:

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

Read all of it.

Then read it again until you understand it.

If you can get this far, your question has been answered fully.

I "do not know anything about Antennas, Transmitters. Feedlines, Matching,
Efficiency,"

Obviously.

U¿ytkownik napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:

Is the field electron emission from the tip top of antenna or not?

No.

Read this:

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

Read all of it.

Then read it again until you understand it.

After you have mastered that, read this:

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

Read all of it.

Then read it again until you understand it.

After you have mastered that, read this:

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

Read all of it.

Then read it again until you understand it.

If you can get this far, your question has been answered fully.

I "do not know anything about Antennas, Transmitters. Feedlines,
Matching,
Efficiency,"

Obviously.

You are ordering me to read the above. Why you do not read it.
There is wrote:
"A further feature of the structure of negative coronas is that as the
electrons drift outwards, they encounter neutral molecules and,
withelectronegative molecules (such as oxygen and water vapor), combine to
produce negative ions. These negative ions are then attracted to the
positive uncurved electrode, completing the 'circuit'.". From: Negative
coronas. Mechanism.
http://en.wikipedia.org/wiki/Corona_...gative_coronas

"The difference, then, between positive and negative coronas, in the matter
of the generation of secondary electron avalanches, is that in a positive
corona they are generated by the gas surrounding the plasma region, the new
secondary electrons travelling inward, whereas in a negative corona they are
generated by the curved electrode itself, the new secondary electrons
travelling outward."

"in a negative corona the electrons are generated by the curved electrode
itself".

Is the field electron emission from the tip top of antenna or not?

S*

Szczepan Bialek wrote:

You are ordering me to read the above. Why you do not read it.

I did read all that and more when I went to school and took electromagnetics
classes.

snip quotes from Wiki

Is the field electron emission from the tip top of antenna or not?

No.

You obviously did not read the information or did not understand it.

"Jeff" napisal w wiadomosci
...


You are ordering me to read the above. Why you do not read it.
There is wrote:
"A further feature of the structure of negative coronas is that as the
electrons drift outwards, they encounter neutral molecules and,
withelectronegative molecules (such as oxygen and water vapor), combine
to
produce negative ions. These negative ions are then attracted to the
positive uncurved electrode, completing the 'circuit'.". From: Negative
coronas. Mechanism.
http://en.wikipedia.org/wiki/Corona_...gative_coronas

"The difference, then, between positive and negative coronas, in the
matter
of the generation of secondary electron avalanches, is that in a positive
corona they are generated by the gas surrounding the plasma region, the
new
secondary electrons travelling inward, whereas in a negative corona they
are
generated by the curved electrode itself, the new secondary electrons
travelling outward."

"in a negative corona the electrons are generated by the curved electrode
itself".

Is the field electron emission from the tip top of antenna or not?

S*


Yes it is, but the effect being talked about is corona discharge, and has
nothing to do with the wanted radiation of radio waves. It is an
*unwanted* effect on normal antennas, and occurs when the voltage at
certain points gets high enough to cause ionization of the air. I repeat
it is normally an *UNWANTED* condition on a normal radio antenna used for
communication.

And the "normal" remedy for it is the earth/chassis/couterpoise.
S*

I doubt that he is a troll. Trolls usually show some intelligence in
adapting their responses, so as to keep the fun going. This one simply
fixates on a few sentences and appears unable to focus on anything out of
the immediate context of the original sentence. This inability to shift
focus to process new information is more a symptom of a cerebral handicap,
something like Alzhheimer's or Asperger's diseases or even early-stage
dementia. Unfortunately, there is not a great deal that medicine can do for
these problems. Perhaps his keepers give him a computer to occupy his
attention.

Internet newsgroups are wonderful (IMO), but there are not good mechanisms
to prevent one or two people from destroying an otherwise excellent group.
One can plonk the offender(s), but that still leaves all the responses
visible. I wish people would simply cease responding to him, since it is a
pointless exercise.

Bill

"Bill Ogden" wrote in message
...
I doubt that he is a troll. Trolls usually show some intelligence in
adapting their responses, so as to keep the fun going. This one simply
fixates on a few sentences and appears unable to focus on anything out of
the immediate context of the original sentence. This inability to shift
focus to process new information is more a symptom of a cerebral handicap,
something like Alzhheimer's or Asperger's diseases or even early-stage
dementia. Unfortunately, there is not a great deal that medicine can do for
these problems. Perhaps his keepers give him a computer to occupy his
attention.

Internet newsgroups are wonderful (IMO), but there are not good mechanisms
to prevent one or two people from destroying an otherwise excellent group.
One can plonk the offender(s), but that still leaves all the responses
visible. I wish people would simply cease responding to him, since it is a
pointless exercise.

Bill

Hello Bill. Thanks - you said it and I thought it. He seems to copy phrases
and paste them without understanding what they mean.
I still reckon we had a good discussion about aerials.

Regards, Ian.

Szczepan Bialek wrote:

And the "normal" remedy for it is the earth/chassis/couterpoise.
S*

No, it is not.

On Apr 17, 3:41*am, Jeff wrote:
Corona discharge has nothing to do with grounding, it is purely due to
the peak voltages seen at, (usually), the tips of the elements.

To what are those peak voltages referenced?
--
73, Cecil, w5dxp.com

On Apr 17, 10:19*am, Jeff wrote:
On 17/04/2012 12:35, W5DXP wrote:
On Apr 17, 3:41 am, *wrote:
Corona discharge has nothing to do with grounding, it is purely due to
the peak voltages seen at, (usually), the tips of the elements.

To what are those peak voltages referenced?

* The feedpoint and the surrounding air molecules

How does one actually measure the voltage on the ends of an antenna?
--
73, Cecil, w5dxp.com

Jeff wrote:


Is the field electron emission from the tip top of antenna or not?

Yes it is, but the effect being talked about is corona discharge, and
has nothing to do with the wanted radiation of radio waves. It is an
*unwanted* effect on normal antennas, and occurs when the voltage at
certain points gets high enough to cause ionization of the air. I repeat
it is normally an *UNWANTED* condition on a normal radio antenna used
for communication.

Jeff

What happens on antennas is NOT "field electron emission" by the modern
definition of the term.

Corona discharge is something else, related, but something else.