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The array consisted of a ring of 120 vertical monopoles covering 2–20 MHz. Tall wood poles supported a 1,000-foot diameter (300 m) circular screen of vertical wires located within the ring of monopoles. His research is still used today to guide the design and site selection of HF/DF arrays. Records of his research are available in the ...
Werner Co. is a privately owned company involved with the manufacturing and distribution of aluminum and fiberglass ladders, light duty construction equipment, fall protection equipment, and similar products. Werner Co. is headquartered in Itasca, Illinois. Werner's customer care division is located in Greenville, Pennsylvania. [1]
A short antenna pole next to a house Multiple Yagi TV aerials. Antennas are commonly placed on rooftops and sometimes in attics. Placing an antenna indoors significantly attenuates the level of the available signal. [19] [20] Directional antennas must be pointed at the transmitter they are receiving; in most cases great accuracy is not needed ...
With no matching unit, Varney specified 75 Ω cable be used at the junction of the ladder line and coax (not 50 Ω); the higher 75 Ω impedance makes a closer match the end of the ladder line. An earth-grounded 4:1 voltage balun may be used to connect the coax to the ladder line, and 1:1 current balun should be used between the coax and the ...
The folded unipole antenna is a type of monopole mast radiator antenna used as a transmitting antenna mainly in the medium wave band for AM radio broadcasting stations. It consists of a vertical metal rod or mast mounted over and connected at its base to a grounding system consisting of buried wires.
Completed in 1963, it was once the tallest structure in the world, and stood at 2,063 feet (629 meters) until 2019, when the top mount VHF antenna was removed for the FCC spectrum repack, dropping the height to 1,987 feet (605.6 m). [1] In 1974, the KVLY-TV mast was succeeded by the Warsaw radio mast as the world's tallest structure.
The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible. [ 1 ] [ 2 ] In a radio transmitter, the transmitter generates an alternating current of radio frequency , and the feed system feeds the current to ...
The British Royal Navy experimented with kite raising antennae on HMS Good Hope in 1903, using a box kite designed by Samuel Franklin Cody. A 300-foot kite raised antenna increased their radio range from 60 or 70 miles to 110 miles. [7] The United States Navy conducted kite antenna experiments on the torpedo boats USS Stringham and USS Bailey ...