Luxemburg EffectOctober 27th Fact-of-the-Day
The action of the ionosphere upon an electromagnetic wave is, at least in theory, not perfectly proportional to a wave's amplitude; i.e., the action is not perfectly linear. Because of that, two or more strong waves from different transmitters simultaneously passing through the same part of ionosphere can theoretically cross-modulate each other. That effect is known as the 'Luxemburg Effect,' because the first reported case where it was thought to be heard involved transmissions from Radio Luxemburg. There have been many reports of similar cross-modulations since. However, the effect is not generally heard between transmissions of most powerful transmitters, so it is likely that most, if not all, reported cross-modulations have been due to causes other than ionospheric nonlinearity. ©2004 Martek International All rights reserved.
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