"Unwashed" hams and "washed" hams
 

On Nov 16, 7:37*am, JosephKK wrote:


Two things. *
Why are you still bothering with him?

Because it's wholesome entertainment for the whole family.

*He loves the attention he is
getting, he is off in some other NG spewing about being the most
responded to poster.

I'm sure he does. But I don't care what he does on other sites.

*The correct response is to kill file him. I have
only read responses to his posts.

I don't kill file anyone. If he bothers you, be my guest.

"Unwashed" hams and "washed" hams
 

Dave wrote:
"High power coaxial transmission lines have hollow center conductors."

Yes, and the metal which could have filled the hollow space would add no
conductivity at HF.

Best regards, Richard Harrison, KB5WZI

"Unwashed" hams and "washed" hams
 

JosephKK wrote:

...
Two things.
Why are you still bothering with him? He loves the attention he is
getting, he is off in some other NG spewing about being the most
responded to poster. The correct response is to kill file him. I have
only read responses to his posts.
Many of you could benefit by setting your newsreader to quote
correctly. Outhouse Express can do it, it may even do it by default.

I am certainly impressed; it is good to stand in the shadow of someone
like you, so freely ready to shovel out your "good advise."

However, right now I don't really require the services of some "great
intellectual" such as yourself. Being capable of handling my own
thinking and affairs at this time, I will pass, at least for the time being.

Frankly, I will be honest will you, I never realized there were so many
stupid people who stand around waiting for someone as gifted as you to
"guide them!" Thanks for the heads-up!

ROFLOL ... me and the wife needed a good laugh, thanks! I bet most miss
you "tongue in the cheek humor! :-) I mean, that is what you intended,
right? smirk

Regards,
JS

"Unwashed" hams and "washed" hams
 

On Nov 16, 12:09*pm, (Richard Harrison)
wrote:
Art wrote:

"This idea of waves moving along with the current flow and various other
ideas put forward by book authors seems to be a never ending attempt to
provide substance(d) to long ago thought out bad theory which would be
disrupted if current was observed to flow in the center of a radiator."

The theory is well tested and good.

Authors often write books to inform. They are paid for their efforts.

Skin effect is a fact of agreement among the scientific community. A
proof is readily at hand. Coaxial cable keeps what`s inside in and
what`s outside out.

The best exposition of "skin effect" that I know of is found in chapter
27 of "Radio-Electronic Transmission Fundamentals" by B. Whitfield
Griffith. The 1st edition was published in 1962. It was republished by
Scitech in 2006. Art would enjoy and benefit from all 638 pages.

Best regards, Richard Harrison, KB5WZI *

Oh My Richard, are you suggesting, but frightened to suggest, that
skin effect is something other than the
swirling eddy current and its negative magnetic effect on the main
magnetic field provided by the applied varying current?
Forget the constant lines of books that you have brought in to the
discussion, what exactly do you think that provides the resistive
action of
skin effect using your own 19 century smarts? On the other hand, if
you have no thoughts of your own then by all means steal an idea from
the Witfield book and share it with all of us. The fact that this old
book is being republished by the publisher is to obtain money and
should not be seen of verification of its contents. Neither should you
accept everything you read without challenge in the absence of any of
your own thinking obtained some 50 years ago.
when you had to listen to a professor so you obtain conformity with
him when the examination paper is judged by him no less?
Art
Art

"Unwashed" hams and "washed" hams
 

Art wrote:
"Einstein may well have been correct even tho not aware of discovries
found after his death."

Wouldn`t anyone like to be aware of all the discoveries made before his
death?

Einstein said something like: "Keep it simple, but not too simple!"

Scientists have in many instances followed Einstein`s advice and reduced
things to simplest terms. Maxwell`s equations as simplified and
explained by Heaviside have been used to successfully predict EM
behavior for a century. They give the answers needed so there has been
no great search for a replacement.

The research at CERN on colliding beams is more likely of interest to
those working with ionizing radiation than to those working with the
nonionizing type we use in radio telecommunications.

There is and was agreement among many with Kraus when he wrote on page
37 of the 3rd edition of "Antennas":
"Although a charge moving with uniform velocity along a straight
conductor does not radiate, a charge moving back and forth in simple
harmonic motion along the conductor is subject to acceleration (and
deceleration) and radiates."

An interesting view of the mechanism of radiation is given by B.
Whitfield Griffith, Jr. on page 315 of "Radio-Electronic Transmission
Fundamentals".

Best regards, Richard Harrison, KB5WZI

"Unwashed" hams and "washed" hams
 

Richard Harrison wrote:
Dave wrote:
"High power coaxial transmission lines have hollow center conductors."

Yes, and the metal which could have filled the hollow space would add no
conductivity at HF.

Best regards, Richard Harrison, KB5WZI


Power handling and efficiency increase as the frequency decreases; a
solid center conductor doesn't help at LF either.

http://www.myat.com/index.html

"Unwashed" hams and "washed" hams
 

Art wrote:
"The fact that this old book is being republished by the publisher is to
obtain money and should not be seen of (as) verification of its
contents."

I`ve had both editions. They are identical in content (no corrections).
Terman says essentially the same things about "skin effect". Griffith`s
examples and drawings are more extensive.

Charges are moved to the surface by reduced inductive opposition there.

Imagine a wire made of many concentric layers. Each layer`s current
produces inductive opposition. This is generated by the current that
layer carries. The inner layer is encircled by all the lines of all the
layers while the exterior layer is encircled by only the lines generated
by its current and none from the lines generated by the current in the
layers under it. Thus, there is little inductive opposition to current
on the surface of the wires.

Best regards, Richard Harrison, KB5WZI

"Unwashed" hams and "washed" hams
 

On Nov 16, 3:57*pm, (Richard Harrison)
wrote:
Art wrote:

"The fact that this old book is being republished by the publisher is to
obtain money and should not be seen of (as) verification of its
contents."

I`ve had both editions. They are identical in content (no corrections).
Terman says essentially the same things about "skin effect". Griffith`s
examples and drawings are more extensive.

Charges are moved to the surface by reduced inductive opposition there.

Imagine a wire made of many concentric layers. Each layer`s current
produces inductive opposition. This is generated by the current that
layer carries. The inner layer is encircled by all the lines of all the
layers while the exterior layer is encircled by only the lines generated
by its current and none from the lines generated by the current in the
layers under it. Thus, there is little inductive opposition to current
on the surface of the wires.

Best regards, Richard Harrison, KB5WZI

Thank you for that Richard. I suspected that such an old book as with
Terman
would not be abreast of the present times and still hanging on to
ideas that are
not in sync with the present day thinking. You surely must know that
a time varying field
upon a diamagnetic material also creates what is known as the Foucault
or eddy current field.
Present day non destructive material testing duplicate this method to
provide a means of looking for a crack or fissure in
materials often after heat treatment or welding. On a unimpared
surface the eddy current swirls
in a closed circuit form on the surface as a result of a applied time
varying current. Relly a reaction in terms of Newtons law.
If there is a crack or fissure in the surface the closed circuit of
the eddy current is broken and it is this that todays inspection
equipment relies upon.
Ofcourse this created magnetic field is in opposition to the applied
magnetic field and this opposition is called a skin effect.
It is called a skin effect because like the aplied current the eddy
current flows on the surface of a conductor and is limited in
penetration.
Ofcourse when this rotating magnetic field is combined with the main
magnetic field its rotary action makes short use of particles that
abide on the surface
where it supplies spin to the particle while excellarating the
particle in opposition to gravity. Ofcourse Richard your term in the
military taught you that a rifle has as groove that curls inside the
barrel which you know is to provide a spin to the bullet so that it
does not wobble end over end and thus lose its accuracy. The particles
by the way are sub atomic and so small that they can pass thru
retaining threads as it were on most materials so its mass and energy
content is quite small such that it will bounce off of rthe shields
surrounding our earth but not so much that it looses its resistance to
gravity before it finds a suitable radiature of resonance that it can
rest upon according to the direction aimed by the transmitter. It will
not deviate from this course if the receiving antenna is not directed
in substantially the same direction. Since there are a lot of these
particles around on Earth there is a scramble for a suitable place to
rest so any vacancy is immediately occupied such that radiation is a
huge lot of levitated particles. Fortunately the Sun keeps on burning
pushing particles away from its own gravitational field otherwise the
11 year cycle would become a century old plus cycle and we would look
for another hobby.Another thing Richard these particles are extremely
small so we will not finish up knee deep. On top of that they also
decay because of diminishing
nuclear content which we see the results of when there is a sun burst
and the clustered particles get into our power system and overloads
it.
Regards
Art Unwin.......KB9MZ.......XG (UK)

"Unwashed" hams and "washed" hams
 

"JIMMIE" wrote in message
...
Isnt this all a little bit like acknowleging someone who is causing
intentional interference on the bands?

yeah, but not like someone who is nasty, more like someone who is funny and
keeps blabbering on saying more and more ridiculous things.

"Unwashed" hams and "washed" hams
 

"Art Unwin" wrote in message
...
On Nov 16, 3:57 pm, (Richard Harrison)
wrote:
Another thing Richard these particles are extremely
small so we will not finish up knee deep. On top of that they also
decay because of diminishing
nuclear content which we see the results of when there is a sun burst
and the clustered particles get into our power system and overloads
it.
Regards
Art Unwin.......KB9MZ.......XG (UK)

OH NO! they are getting into the power system! heaven forbid, what shall we
ever do!?!?!

it just keeps getting better and better.