LF: Is this the Luxembourg effect ?

[Alberto di Bene <dibene@usa.net>]

LF group,

   tuning at 128.930 kHz, the frequency of the German power utility station, in 
USB mode,
I can hear what is possible to listen to in this 30 sec. MP3 file :

http://www.sdradio.eu/audio/luxmbrg.mp3

Is this what is called the Luxembourg effect ? I hear a mix of various 
broadcasting stations
in the intervals between the data streams. I used the mini-whip and Perseus, 
and strongly doubt
that one of these components can be the cause of what otherwise could be 
attributed to intermodulation.
Or, saying it better, it *is* intermodulation, but the responsible is the 
ionosphere.

Am I right ? Is that the (in)famous Luxembourg effect ? Or there is another 
reason for that ?

TNX

73  Alberto  I2PHD