MAKE A MEME View Large Image Umbrella antenna 1910.png umbrella antenna a monopole antenna used for LF transmitting at the longwave wireless telegraphy station of the Amalgamated Radiotelegraphic Co at Cullarcoats on the Northumberland coast near Newcastle England in ...
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Keywords: Umbrella antenna 1910.png umbrella antenna a monopole antenna used for LF transmitting at the longwave wireless telegraphy station of the Amalgamated Radiotelegraphic Co at Cullarcoats on the Northumberland coast near Newcastle England in 1910 It consists of a 220 ft wooden lattice tower with two wires running from the transmitter in the building to the top connected at the top to 24 bronze wires extending radially from the mast on a diagonal attached to ropes which are anchored to the ground on a circle 220 ft in radius The vertical wires served as an electrically short quarter-wave monopole antenna while the radial wires served as a capacitive top hat to increase the current in the vertical radiators The other side of the transmitter was connected to a ground Earth system consisting of buried cables radiating from the base of the mast It transmitted with both a spark gap transmitter and a Poulsen arc transmitter on a frequency of 200 kHz 1910 Retrieved February 17 2015 from https //books google com/books id qQFVAAAAMAAJ pg PA797 John Ambrose Fleming 1910 The Principles of Electric Wave Telegraphy and Telephony 2nd Ed Longmans Green and Co New York p 797 fig 16 on Google Books John Ambrose Fleming Fleming died in 1945 other versions PD-old-70-1923 Wire antenna Uploaded with UploadWizard
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