Different short-wave frequencies (with wavelengths shorter than 120 meters) can be reflected well and transmitted by long bounces around the world during times when different conditions prevail in the ionosphere. So transmitters for such organizations as VOA (Voice of America) and BBC (British Broadcasting Corporation) will change operating frequencies from month to month and also from time to time during a 24 hour period.= = = White-flippered penguin = = =
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