Topband: Presentation on the Development of Transoceanic Radio Communications from 1860

[donovanf at starpower.net]

I gave a presentation on the history of transoceanic radio communications 
to the Frankford Radio Club a few days ago. 



www.youtube.com/watch?v=pLN0MMxCvlc 


My presentation covers radio technology development from the Maxwell's 
mathematical description of electromagnetic waves in 1860-1865, Hertz's 
development of a crude spark transmitter and spark receiver that proved 
the existence electromagnetic waves in 1886-1888, Fessenden's hetrodyne 
receiver patent in 1901, Marconi's development of two way transoceanic 
high power radio spark communications from 1901 through 1907, the 
development of multi-hundred-kilowatt spark, arc and electron tube 
transmitters from 1906 through the 1930s, Armstrong's development of 
regenerative and superhetrodyne receivers from 1913-1918, ARRL's very 
successful one way transatlantic test in 1921 at about 1 MHz, the development 
of military and commercial HF receiver, transmitter and antenna technology 
from 1921 through the 1970s, and the development of early operational satellite 
communications capabilities from before 1960 through the 1970s. 


My presentation closes with a brief description of recent Armed Forces Day 
operations on the site of the original NSS station. 


Enjoy! 


73 
Frank 
W3LPL