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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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coaxial cable

A strong, flexible, high-capacity cable widely used in audio, video and data applications. Commonly called "coax" (pronounced "co-axe"), the cable comprises a solid or stranded wire in the center, surrounded by insulation. The insulation is wrapped with a metallic foil or braided wire that serves as the ground line and interference shield. All of this is enclosed in a plastic cover, which may have a fire-safe Teflon coating.

There Are Many Types
Typically with impedances of 50 or 75 Ohms, cables have different outside diameters and maximum capacities for operating voltage. Designated with an RG (radio grade) prefix such as RG-6, cables are also rated for signal loss (attenuation in dBs per 100 feet). Following are common types; however, there are many more in use. See RCA connector and F connector.

        Impedance  Core   Layers        Range in   Dia.     inType         Ohms     (mm)   Sheath

  RG-6        75-76     1.0      2
  RG-6 Quad   75-76     1.0      4

  RG-58       50-53.5   0.9      1

  RG-59       73-75     0.81     1
  RG-59 Quad  73-75     0.81     4

Coaxial Cable
Coax uses two wires. The inner wire is the primary conductor. The ground wire is an aluminum or copper sheath that surrounds the insulation of the primary conductor and also serves as a shield against external interference.
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References in periodicals archive ?
Melbourne, Nov 2 (ANI): Actress Nicole Kidman says she's terrified of singing and has to be coaxed into it.
In the study, scientists coaxed Costa Rican zebra tarantulas (Aphonopelma seemanni) to crawl up steep glass surfaces.
(What they had in mind: '70s consciousness-raising feminist groups holding meetings in dens as well as teenage punk bands practicing in basements.) The result: ROOM, 2005, a weird, cartoonlike rendering of the living room we all grew up in, complete with that carpet (scratchy but somehow comforting beige nylon pile), coaxed into swells that served as casual seating and bled indistinctly into the "stage" where Tracy and her sidekicks would perform.
The reader can almost feel the crescendo that surely must have propelled each dance r into the air; the drums and violins that must have coaxed that dancer to hold his or her long, strong extension.
French scientists have successfully coaxed stem cells from mouse embryos to morph into skin cells, a finding they hope could lead to a new source of replacement skin for burn victims and others.