On 04/10/2012 04:22 AM, Szczepan Bialek wrote:
In 1909 Marconi wrote:
http://www.nobelprize.org/nobel_priz...ni-lecture.pdf

"The necessity or utility of the earth connection has been sometimes
questioned, but in my opinion no practical system of wireless telegraphy
exists
where the instruments are not connected to earth."

It is still true?
S*

It obviously never was true. My guess is that the reasoning at the time
stemmed from a lack of understanding of far-field electromagnetic wave
propagation (and electromagnetics in general), failure to construct
apparati of sufficient sensitivity due to technology limitations, and
inefficient antenna designs (relative to using the earth as a
counterpoise.) I also think Nikola Tesla failed to grasp these concepts
as well. Sincerely, and 73s from N4GGO,

--
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