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ionospheric ducting

Ionospheric ducting is a term used to describe how fragments of radio broadcasts or walkie-talkie communications can travel thousands of miles by occurring in electronic layers of the ionosphere that create small “ducts” that allow them to travel great distances. The observational evidence for long-range propagation of high-frequency radio signals began to accumulate in 1926 when transatlantic communication links had been established. In 1927, signals were detected that had propagated over large distances or circled the Earth with little attenuation.*

According to Jurgen Graff, a former engineer at Telefunken, "a taxi driver communication in New York could suddenly be monitored for a couple of minutes in Europe. After a few minutes the ducts collapse and the phenomenon disappears." (Roach, p. 188).

It is likely that some of the recordings put forth as evidence of spirits communicating from the afterlife are due to ionospheric ducting.

See also electronic voice phenomena and Konstantin Raudive.

further reading

books and articles

Clark, Ronald W. (1977). Edison - The Man Who Made the Future. G. P. Putnam’s Sons.

Raudive, Konstantin. (1971). Breakthrough: An amazing experiment in electronic communication with the dead. Smythe.

Roach, Mary. (2005). Spook: Science Tackles the Afterlife. W.W. Norton.


Electronic Voice Phenomena: Voices of the Dead? by James E. Alcock

This is EVP: A Look Behind the "The Ghost Orchid" CD by Mark Poysden

news story

Blasts from the past by Mark Pilkington, The Guardian August 5, 2004


America's dumbest videos: EVP

Last updated 27-Oct-2015

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