Search results
Results from the WOW.Com Content Network
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 ...
Werner Co. was founded in 1922 by Richard D. Werner as "R. D. Werner Co., Inc.," which specialized in metal moldings. R. D. Werner Co., Inc. became a leader in plastics extrusion during the World War II restrictions on civilian metal usage. After the war, Werner started working with aluminum and developed an emphasis on producing aluminum ...
An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...
He was first employed by the U.S. Air Force and then GT&E Sylvania Electronics Systems on CDAA and other antenna projects. Professor Edgar Hayden, then a young engineer in the University of Illinois Radio Direction Finding Research Group, led the reassembly of the Wullenweber , studied the design and performance of HF/DF arrays and researched ...
In May 1954, the Alliance Manufacturing Company first produced its own garage door opener and called it Genie. [2] In 1983 the company entered the home and shop vacuum market, and in 1985 it changed its name to Genie Home Products. [2] Overhead Door Corporation purchased the company in 1994. [2] The Genie Company is headquartered in Mt. Hope ...
In a so-called "aperture antenna", such as a horn or parabolic dish, the "feed" may also refer to a basic radiating antenna embedded in the entire system of reflecting elements (normally at the focus of the parabolic dish or at the throat of a horn) which could be considered the one active element in that antenna system. A microwave antenna may ...
The Irving Porter Church Memorial Telescope (built in 1922) on its original Warner & Swasey mount. The 12" objective lens was polished by Brashear Co. The first Warner & Swasey telescope, built in 1881, [ 8 ] was sold to Beloit College for its new Smith Observatory and had a 9.5-inch lens made by Alvan Clark & Sons .
An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline. Antenna tuners are particularly important for use with ...