"JIMMIE" wrote
...

S" needs to go back and read in totality the paper on Luxenbourg
Effect. It explains that you DO in fact have a non-linear medium in
the form of a charged ionosphere during periods of the effect.
It is also difficult to tell whether or not what seems to be a case of
the Luxenbourg effect is in fact just intermodulation distortion
occurng in the receiver.

The paper is from 1935. The year and half after the first observation. Now
we have 2009.
Probably were the next observations. Some of you may have yours own.
What we need to analyse:
1. Type of mast (half-wave, or 1/4) and the frequency,
2. The frequency at which on the receiver a faint background appears.

Of course only the cases where the frequency doubling take place.
S*