Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG

On Thu, 18 Oct 2007 17:04:26 -0700, art wrote:

Where does the current flow when it reaches the END of a fractional
length?

Does this question anticipate your introduction of a PaleoGaussic
theory of any single electron flowing from end-to-end (of any antenna)
in the time it takes to resonate?

Hint: Even an English Major knows Electrons at 160M would barely
wiggle an µM away from the feedpoint before they turned around and
went back on the next half of the first cycle - etc.

73's
Richard Clark, KB7QHC

"art" wrote in message
oups.com...
Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG


it turns around and goes right back down the way it came.

On 19 Oct, 03:55, "Dave" wrote:
"art" wrote in message

oups.com...

Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG

it turns around and goes right back down the way it came.

So a electrical generater doesn't keep turning in one direction
but instead it occillates at the desired frequency.
I have never seen one do that!
And "end effect" is the confusion created at the top of the radiator

"art" wrote in message
ps.com...
On 19 Oct, 03:55, "Dave" wrote:
"art" wrote in message

oups.com...

Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG

it turns around and goes right back down the way it came.

So a electrical generater doesn't keep turning in one direction
but instead it occillates at the desired frequency.
I have never seen one do that!
And "end effect" is the confusion created at the top of the radiator


'end effect' is an effect of the capacitance seen from the end of the
antenna to ground or the other part of a dipole.

how does a generator come into this? you feed current into a wire with an
open end, it gets to the end, reverses direction and goes back to where it
started. no frequency was stated or implied all you asked was where there
'current' went... that could be any kind of current including a step or
pulse or sinusoids of any frequency.

"art" wrote
And "end effect" is the confusion created
at the top of the radiator
____________

Those wanting a more accurate description can find it here...

http://books.google.com/books?id=U-3...n8RnFgaJ57mgyo

RF

On 19 Oct, 06:45, "Dave" wrote:
"art" wrote in message

ps.com...





On 19 Oct, 03:55, "Dave" wrote:
"art" wrote in message

groups.com...

Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG

it turns around and goes right back down the way it came.

So a electrical generater doesn't keep turning in one direction
but instead it occillates at the desired frequency.
I have never seen one do that!
And "end effect" is the confusion created at the top of the radiator

'end effect' is an effect of the capacitance seen from the end of the
antenna to ground or the other part of a dipole.

how does a generator come into this? you feed current into a wire with an
open end, it gets to the end, reverses direction and goes back to where it
started. no frequency was stated or implied all you asked was where there
'current' went... that could be any kind of current including a step or
pulse or sinusoids of any frequency.- Hide quoted text -

- Show quoted text -

The current comes from a generator does it not? So how is that current
produced?
I see a generator turning in one direction only all the time where you
are suggesting that it is occillating.
Pretty hard to draw a circuit if it tracks back the way it came.
Draw a graph of an occillating current as you would see on a scope
that shows two degrees of freedom.
Does the "x" direction stop after a half cycle?

art wrote:
On 19 Oct, 03:55, "Dave" wrote:
"art" wrote in message

oups.com...

Pseudo experts of fractional wavelength antennas.
Where does the current flow when it reaches the END of a fractional
length?
verticle antenna and why?
How does this relate to the term "end effect"?
If you have already written a book then tell us what the auther said.
Art KB9MZ.....XG
it turns around and goes right back down the way it came.

So a electrical generater doesn't keep turning in one direction
but instead it occillates at the desired frequency.
I have never seen one do that!
And "end effect" is the confusion created at the top of the radiator


I don't have to be an engineer to question this one. An electrical
"generator" does indeed keep turning in a single direction. It has
brushes and split commutator rings to keep the current flowing in only
one direction. That is in the very nature of a "generator." The device
I suspect that you are alluding to is an "alternator" in which a
magnetic field is rotated through a coil of wire and passes through both
halves of the coil at the same time. Since in a well designed, single
phase alternator the center of the magnetic field and the center of the
coil of wire are coincident the current does indeed alternate because
unlike a generator the alternator does not include any means of flopping
the connections on the coil in time with the magnetic field. So as the
negative and positive fields of the magnet pass through each half of the
coil of wire in turn the current reverses direction.
--
Tom Horne, W3TDH

Art wrote:
"And "end effect" is the confusion created at the top of the radiator."

When the signal arrives at the open circuit end of the antenna, current
can not continue its forward flow. It abruptly stops, no longer
producing a magnetic field.

Energy from the magnetic field is converted to energy in the electric
field for an instant (Cecil`s famous conservation of energy). This
produces an insreased voltage at the open circuit end. This incresed
voltage has more capacitive effect, akin to the "Miller effect" caused
by the higher signal voltage on the plate of an amplifier vacuum tube
than on its grid.

On a transmission line or on an antenna system, we used to call this
capacitive action the "Ferranti effect"

Best regards, Richard Harrison, KB5WZI

On Oct 19, 6:52 am, "Richard Fry" wrote:
"art" wrote And "end effect" is the confusion created
at the top of the radiator

____________

Those wanting a more accurate description can find it here...

http://books.google.com/books?id=U-3...&dq=antenna+en...

RF

Thanks, Richard. I notice that article references King, I assume
Ronold W. P. King, who wrote some very nice qualitative explanations
of various linear and loop antennas in King, Mimno and Wing's
"Transmission Lines, Antennas and Waveguides."

There's also a nice explanation that I feel is quite accurate in
Joseph Boyer's "The Antenna--Transmission Line Analog," from Ham Radio
magazine, April and May 1977. I believe I have it somewhere as a PDF,
scanned from the article.

Cheers,
Tom