"Dave" wrote
...
On Mar 21, 12:11 pm, Szczepan Bia³ek wrote:

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

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

The two sources not in phase double the frequencies.
S*
so why when i switch my transmitter from a 'monopole' where YOU can't

see the other half to a dipole does the frequency stay the same?

Your transmitter has the same but in the receiver antenna is possibility
that appear the doubled frequency.
Luxembourg effect was observed in 1930. Now radio people manage with
eliminating it.
S*

nope, the receiver still hears the proper transmitted frequency.

Yes. THY receiver is tuned to the transmitted frequency.
Luxembourg effect means that another receiver tuned to the doubled your
frequency hears you.
S*