common mode current
 

"Boomer" wrote in message
...
On 7/10/2012 4:27 PM, Ian wrote:
"Boomer" wrote in message
...
I looked at my antenna the other day while I was talking. I saw some
jumping off. Szczepan has been right all along. Or maybe it was bird do
do
I saw falling. Anyway, something was coming down from my antenna.

Michael

Hello Michael.

The do do has been extinct for centuries. Have I misunderstood your
email?

73, Ian.



There was a bird on my antenna wire. I think he may have crapped about the
time I was looking. It was either that or a huge bunch of electrons all
fell off at once.

Michael

I prefer to think of the do-do. Keeping birds off aerials could be a
rewarding topic. I think the pigeons that perch on my HF beam nibble at the
trap end caps. Not good news.

73 Ian.

common mode current
 

On 7/11/2012 12:33 PM, wrote:
Szczepan Bialek wrote:

U?ytkownik "Ian" napisa? w wiadomo?ci
...
"Szczepan Bialek" wrote in message
.. .

Your antennas are the diwire.
From the radiating wire the electrons jump off and penetrate into the
counterpoise wire.
It would be interesting to know if is any difference in behavior of the
different wires.
S*

Hello Szczepan.
"Diwire"? What's that?

In English the Ham dipole is the same as the two wires where one is
connected to the live conductor and the second to the bride.

There is no "Ham dipole", there are only dipoles.

There is no "live conductor" and there is no "bridge".

In Polish the Ham dipole consist of the radiator and counterpoise.

There is no "Ham dipole", there are only dipoles.

A dipole does not have a counterpoise.


So the correct name for such aerial is "diwire".

Pure babble.


"From the radiating wire the electrons jump off and penetrate into the
counterpoise wire."
Sounds like a rather short circuit. Not much chance of a QSO.

From Maxwell time all circuits are closed (displacemment current).
See at that: http://educypedia.karadimov.info/lib...entstehung.gif

This picture has nothing to do with what is being discussed.

The short circuit would be if the radiator and the counterpoise are close to
itself.

Pure babble.

They are in such cofiguration in the transmitting line.

Pure babble.

Have you QSO with the line alone?
S*

How many antennas have you built in your lifetime that you continue to argue
with and ignore people that have build hundreds of antennas?




Hey it is not all babble. I had my bride hold one end of my dipole once
for a quick check of SWR. It sounds as if I would get out a lot better
if I had her up there holding one end all the time. The bad news is that
she said she was not going to help me any more with climbing trees and
fastening my antennas. She has done this for me for 50 years and now
suddenly she gets cold feet at going up in a little 90 foot fir tree.
What they say is true, "nothing good lasts forever".

She helps with antenna construction but will not climb a tree. I don't
know if this is legal grounds for divorce in Michigan. If it is, I could
show her the statute and ask her again about that 90 foot tree I want
her to climb. She started climbing trees for my antennas when she was 11
years old. How could she stop now????

Michael

common mode current
 

"Boomer" wrote in message
...
Hey it is not all babble. I had my bride hold one end of my dipole once
for a quick check of SWR. It sounds as if I would get out a lot better if
I had her up there holding one end all the time. The bad news is that she
said she was not going to help me any more with climbing trees and
fastening my antennas. She has done this for me for 50 years and now
suddenly she gets cold feet at going up in a little 90 foot fir tree. What
they say is true, "nothing good lasts forever".

She helps with antenna construction but will not climb a tree. I don't
know if this is legal grounds for divorce in Michigan. If it is, I could
show her the statute and ask her again about that 90 foot tree I want her
to climb. She started climbing trees for my antennas when she was 11 years
old. How could she stop now????

Michael

Hello Michael. Over here, in the old country, we attach the wire to a
sapling and we wait. We're good at waiting. As the sapling grows we pay out
a little more wire. Eventually, we have our wire at the height we want.
Caution - if your bride offers to climb a tree for you, do not let her carry
anything heavy.
Stay away from the tree. Wear a hard hat. Tell her that your life insurance
does not pay out for injury or death due to falling objects (for falling
objects are due to gravity and that's an act of nature).

73, Ian.
ps. It has been unduly sunny over here to-day. The sun affects we Brits as
we don't see it very often. In fact, it's probably easier here in Britain to
see an electron shoot past than to see the sun.
73 agn.

common mode current
 

"Boomer" wrote in message
...
Hey it is not all babble. I had my bride hold one end of my dipole once
for a quick check of SWR. It sounds as if I would get out a lot better if
I had her up there holding one end all the time. The bad news is that she
said she was not going to help me any more with climbing trees and
fastening my antennas. She has done this for me for 50 years and now
suddenly she gets cold feet at going up in a little 90 foot fir tree. What
they say is true, "nothing good lasts forever".

She helps with antenna construction but will not climb a tree. I don't
know if this is legal grounds for divorce in Michigan. If it is, I could
show her the statute and ask her again about that 90 foot tree I want her
to climb. She started climbing trees for my antennas when she was 11 years
old. How could she stop now????

Michael

Hello Michael. Over here, in the old country, we attach the wire to a
sapling and we wait. We're good at waiting. As the sapling grows we pay out
a little more wire. Eventually, we have our wire at the height we want.
Caution - if your bride offers to climb a tree for you, do not let her carry
anything heavy. Stay away from the tree. Wear a hard hat. Tell her that your
life insurance
does not pay out for injury or death due to falling objects (for falling
objects are due to gravity and that's an act of nature).

73, Ian.
ps. It has been unduly sunny over here to-day. The sun affects we Brits as
we don't see it very often. In fact, it's probably easier here in Britain to
see an electron shoot past than to see the sun.
73 agn.

common mode current
 

On 7/11/2012 2:45 PM, Ian wrote:
"Boomer" wrote in message
...
On 7/10/2012 4:27 PM, Ian wrote:
"Boomer" wrote in message
...
I looked at my antenna the other day while I was talking. I saw some
jumping off. Szczepan has been right all along. Or maybe it was bird do
do
I saw falling. Anyway, something was coming down from my antenna.

Michael

Hello Michael.

The do do has been extinct for centuries. Have I misunderstood your
email?

73, Ian.



There was a bird on my antenna wire. I think he may have crapped about the
time I was looking. It was either that or a huge bunch of electrons all
fell off at once.

Michael

I prefer to think of the do-do. Keeping birds off aerials could be a
rewarding topic. I think the pigeons that perch on my HF beam nibble at the
trap end caps. Not good news.

73 Ian.



Ian, I am pretty advanced in years. I am 69. I can remember a comedian
whose name escapes me. He got paid good money for coming on stage and
talking just like Szczepan. I think it would be a gas for him to address
a large gathering of amateur radio operators. He could have us all in
stitches in a few seconds.

I get a fair amount of entertainment value just reading his posts. Some
of them are laugh out loud moments for me. I don't know whether his is
truly that ignorant or is just having fun with us. It doesn't matter. He
is funny.

BTW Szczepan, I have a loop antenna for low band. The electrons go
around in a circle and I recycle them. This saves a huge amount on my
electric bill.

Michael

Michael

common mode current
 

Rob wrote:
wrote:
Rob wrote:
wrote:
But you can order in NASA proper insulator.

NASA is not a store and you can not order anything from NASA, you babbling,
ignorant, ineducable, idiot.

I remember well that in the past the domain nasa.com was in use by
some mail order store. I don't know if that store still exists, it
seems difficult to find any details about it. The nasa.com domain
now appears to be in the hands of a cybersquatter.

(of course the domain for the National Aeronautics and Space Administration
is nasa.gov, but I doubt you can order insulators there)

As a general rule, US government agencies are forbidden by law from selling
"stuff" and particularly fobidden from selling anything commercially
available.

I call bull****. You can order lots of things at the National Aeronautics
and Space Administration. It is primarily promo material.

What part of "general rule" and "commercially available" do I need to
explain to you in minute detail?

How commercially available is promo material for NASA?

Can I get it at Walmart?

common mode current
 

"Boomer" wrote in message
...
Ian, I am pretty advanced in years. I am 69. I can remember a comedian
whose name escapes me. He got paid good money for coming on stage and
talking just like Szczepan. I think it would be a gas for him to address a
large gathering of amateur radio operators. He could have us all in
stitches in a few seconds.

I get a fair amount of entertainment value just reading his posts. Some of
them are laugh out loud moments for me. I don't know whether his is truly
that ignorant or is just having fun with us. It doesn't matter. He is
funny.

BTW Szczepan, I have a loop antenna for low band. The electrons go around
in a circle and I recycle them. This saves a huge amount on my electric
bill.

Michael

Michael

Hello Michael. From where I am sitting, 69 isn't all that old. I have
friends heading for 90 who are definitely not showing their age.
Was the comedian a Brit named Stanley Unwin or an American named Fred ???
73, Ian.

common mode current
 

Boomer wrote:

Hey it is not all babble. I had my bride hold one end of my dipole once
for a quick check of SWR. It sounds as if I would get out a lot better
if I had her up there holding one end all the time. The bad news is that
she said she was not going to help me any more with climbing trees and
fastening my antennas. She has done this for me for 50 years and now
suddenly she gets cold feet at going up in a little 90 foot fir tree.
What they say is true, "nothing good lasts forever".

She helps with antenna construction but will not climb a tree. I don't
know if this is legal grounds for divorce in Michigan. If it is, I could
show her the statute and ask her again about that 90 foot tree I want
her to climb. She started climbing trees for my antennas when she was 11
years old. How could she stop now????

Michael

I think you should be grateful for the free ride you got and leave it at that.

common mode current
 

Ian Jackson wrote:
In message ,
writes
Szczepan Bialek wrote:





Simply same of you do not know that "dipole" is a radiator and counterpoise.

A dipole does NOT have a counterpoise.

As I keep saying, I'm convinced that Szczepan is thinking of a situation
where a dipole fed directly with coax. He may have seen diagrams which
show this, and they have become fixed in his mind.

I think he is totally unable to understand that an antenna and a transmission
line are two different things.

Then, because the coax is (usually) grounded at the TX end, he believes
that the leg of the dipole, which is connected to the coax screen, is
also grounded - and therefore it serves the function of a counterpoise -
like you might use in a situation where the antenna is a directly-fed
end-fed wire situations, and it is not possible to get a good ground
connection.

In a way, Szczepan is sort of right. Consider the situation where a
dipole (no balun) is connected to the TX via essentially zero length
coax, and the TX chassis is not well grounded. [For example, possibly
there is a physical safety ground connection, but it is too long to be
effective at RF.] The 'ground' side of the of the dipole would indeed
function as a counterpoise, which might - or might not - radiate
effectively (depending on its height, its physical relationship relative
to the 'live' leg etc).

That does not change a dipole into anything other than a dipole.

Feeding an antenna with any transmission line ill suited for the antenna
will of course lead to unwanted currents which will radiate to some
degree.

However, the antenna is defined by the geometry of the antenna and the
transmission line does not change the radiation of the antenna unless
you are doing something really stupid like taping the transmission line
to one of the elements of the antenna, which changes the antenna
geometry.

Feeding an unbalanced load such as a ground plane with balanced line
will also lead to unwanted currents which will radiate to some degree,
but the ground plane antenna is still a ground plane antenna.

It appears to me that someone has been reading too many Wikipedia articles - especially the ones that I wrote a long time ago.
Not to mention too many old editions of S9 and CQ magazine.

In the mid 60's - we talked about Tower Lighting - where the energy emitted from the antenna was being asorbed and reflected and radiated by the tower - which technicially was being electrostatically charged.

This was also the reason why HY Gain came up with the little egg beater / colineariator on top of their vertical antenna's such as the Super Magnum 117..

I think someone forgot to give Sheldon his medications today and he has gotten a little out of hand and the other techo geeks on this forum decided to attack.

Would everyone please take a chill pill and just calm down and relax.

I'm sure you can display your Pedant knowledge to someone a little less bright then you, say maybe the check out girl at the grocery store or the guy that pumps your gasoline into your vehicle at the gas station.