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Slew ring bearing. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill.
Rat-race coupler. A rat-race coupler, also known as a hybrid ring coupler, is a type of coupler used in RF and microwave systems. In its simplest form, it is a 3 dB coupler and is thus an alternative to a magic tee.
The antenna support consisted of a turntable that sat on the floor of the tent and had a mast projecting upward and through the bearing at the top. The antenna was then built up on top of this mast. The antenna support structure consisted of eight separate steel frameworks that looked similar to scaffolding and were assembled into a two-high ...
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz. [ 1 ]
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On Thursday, President Joe Biden signed an executive order designating Christmas Eve as a federal holiday for most employees.
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