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Only one of the loops in the quad is connected to the feedline, and that loop functions as the driver for the antenna and is the original source for the radiated signal. The other loops are parasitic elements that act as reflectors or directors, focusing the radiated waves in a narrower, single direction and thereby increasing the gain.
A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent signal distortion in long-distance telegraph transmission cables.
A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. A quad is a Yagi–Uda antenna ("Yagi") made from loop elements instead of dipoles: It consists of a driven element and one or more parasitic elements ; however in a quad, each of the loop elements may be square, round, or some other shape.
A charged particle beam in a quadrupole magnetic field will experience a focusing / defocusing force in the transverse direction. This focusing effect is summed up by a focusing strength which depends on the quadrupole gradient as well as the beam's rigidity [] = /, where is the electric charge of the particle and
Quad 33 pre-amplifier Quad II power amplifier Following the mass production of 'stereo' vinyl records in 1958, the QC 22 control unit was developed and released in 1959. [ 3 ] This was a stereo control unit that was designed to be used with a pair of QUAD II mono power amplifiers.
A helical antenna is an antenna consisting of one or more conducting wires wound in the form of a helix.A helical antenna made of one helical wire, the most common type, is called monofilar, while antennas with two or four wires in a helix are called bifilar, or quadrifilar, respectively.
The European figure skating championships carried on Thursday, even as the skating world mourned athletes who died when an American Airlines jet collided with an Army helicopter near Washington, D.C.
A bifilar coil is an electromagnetic coil that contains two closely spaced, parallel windings. In electrical engineering , the word bifilar describes wire which is made of two filaments or strands.