"joe" wrote ...
Szczepan Bia³ek wrote:

So I repeat my question: Are now the FM stations which use the dipoles?

You significant lack of understanding of dipoles is causing you to ask
silly questions that are meaningless.


and Luxembourg has nothing to do with it, your silly frequency
doubling notions should be packaged up in art's box and never see the
light of day.

The dipoles have the directional pattern like this:
http://www-antenna.ee.titech.ac.jp/~...ole/index.html

This shows effects over a 48:1 frequency range. The FM band represents a
1.23:1 range. The image has no bearing on the topic at hand.


It looks like the interference of the many sources (dipoles have the
two).

The two sources not in phase double the frequencies.

This is completely wrong. In a _linear_ systems adding two signals cannot
create new frequencies, including doubling. In the frequency domain this
is clear. If you look in the time domain and look at zero crossings you
may be confused. Do the math for the addition of two sine waves of
different phase.

In reality no sine waves. In the ends of a dipole the voltage is doubled
(VSWR) and the strong picks are radiated.

Stop relying on internet images you don't understand and may not have any
relevance to the discussion.

Discussion is on the harmonics. The dipoles can produce the frequency
doubling.

You can do the math in the time domain, or frequency domain. Either should
tell you there is no doubling of frequencies.

In the school math the water waves are transversal. Look as they are
like: http://en.wikipedia.org/wiki/Stokes_drift

In order to generate new frequencies you need to have a non-linear effect.
Addition is NOT a non-linear operation.

The two picks from the ends of the dipole are not linear.
S*


S*