"Jeff" napisal w wiadomosci
...

No it wasn't, it was receiving the audio from Radio Luxembourg, whilst
tuned to and receiving another MW station (not at twice the frequency).

In 1933 newspaper was wrote that exactly twice.

That is you heard both stations simultaneously. This is nothing to do
with
harmonics at twice the frequency, it is a phenomenon known as cross
modulation.

Is the cross modulation if the LW are from the monopole antenna?
S*


I don not understand what you are trying to ask, The Luxembourg effect wa
son MW not LW, and it has nothing to do with antennas, it is mixing in the
ionosphere of 2 signals.

"In 1933, Radio Luxembourg opened a 200 kW long wave transmitter,
broadcasting in English from the Grand Duchy in the afternoons and
evenings."
From: http://frequencyfinder.org.uk/trans_hist1.html

It was a dipole mast. The same was in Warsaw . The same effect was observed
(the LW were received on radio set as MW).
Now is a 1/4 WL mast and no the effect.
S*