"Rob" napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:

"Rob" napisa3 w wiadomo?ci
...
Szczepan Bialek wrote:
And of course, no current is going to flow into the open-circuit at the
end
of the dipole so the total energy in the magnetic field at that point
is
zero.

You assume that there no field electron emission. Why?

Because if it was there, you would see the sparks and corona effects.

It is better to measure it:

Why don't you try that?

"Ian White GM3SEK wrote:

Coming back to the effectiveness of baluns, the final decider is the
amount of unwanted RF current on the outside of the coax shield,
compared to the wanted current in the antenna element. The only way to
find that out for sure is to *measure* it, in the system as installed.

I'm a big fan of RF current meters based on simple snap-on ferrite
beads. Add a few turns of wire, one resistor, a diode detector, and you
have a real measuring instrument. It's a real eye-opener to be able to
snap the meter over any cable and *see* the common mode RF current.

Have you the result of counting of electrons which go forwards and
backwards
at the feed point?

You have the misunderstanding that the current on the outside of the
coax cable is the result of electron emission by the antenna. This
is of course not true. It is the result of imperfect symmetry or
imperfect balun operation.

But now is possible to measure the currents. Somebody wrote: "I'm a big fan
of RF current meters".
Do you know the results?
S*