"Paul Keinanen" wrote
...
On Sat, 20 Mar 2010 09:26:04 +0100, Szczepan Bia?ek
wrote:

It sound like the "Luxemburg Effect". The signal was from the dipole
antenna.

The Luxemburg effect is usually contributed to the suspected Radio
Luxemburg intermodulation products caused by the _ionosphere_
nonlinearities.

Are such products the hours independent? Is ionosphere all time the same.
The dipole on the tip top of the mountain (the both end of the dipole were
:seen") produced the doubled frequency.

Similar intermodulation effects can be obtained by the nonlinearities
caused by rusty bolts in a transmitter tower.

The same was obtained in Warsaw tower (collapsed years ago).
Now Warsaw use monopole.
S*