Coaxial Cable: SPECIALTY COAXIAL CABLES
Product Announcement from Coast Wire & Plastic Tech., LLC
Coaxial and triaxial cables are used in a variety of electronic applications in which electromagnetic shielding is desired to provide noise-free transmission of the signal carried by the central conductor of the cable. It is known that in many applications a conventional cable having a center conductor surrounded by a single flexible coaxial sheath does not have sufficient shielding properties to provide adequate suppression of EMI or RFI interference. Accordingly, a second flexible coaxial sheath which is a good conductor is positioned in concentric relation to the first coaxial sheath which is also a good conductor. These two sheaths are either in electrical contact or separated by an interlayer of dielectric material having a relatively low dielectric constant and a low dissipation factor. When this interlayer dielectric is used, the construction is commonly called a triaxial cable.
A triaxial cable is designed to transmit all the video signals as well as the service signals, such as the audio, interphone, remove control, and servocontrol signals, by frequency division multiplexing on the internal coaxial structure:. Triaxial cable is commonly utilized to conduct radiofrequency signals at 20 megaHertz with a nominal impedance of 75 ohms, such as for transmission of video signals.
A standard coaxial cable has a center conductor surrounded by a dielectric, a conductive braid, and a covering jacket. In triaxial cable, two additional layers are provided, an outer braid covered by an outer jacket. The inner conductor is surrounded by a dielectric insulation of controlled thickness so that the intermediate shield braid is coaxial there around, and another dielectric insulation layer surrounds the intermediate shield and in turn is surrounded by the outer shield braid around which is an outer jacket. Triaxial cables are often terminated by triaxial electrical connectors.
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Coast Wire's established system and testing capabilities are your assurance of receiving products that, at minimum, meet or exceed industry standards. Quality starts in our receiving department where all raw materials are inspected to ensure that it's exactly what was ordered. Before we start the manufacturing process, a preliminary specification is sent to the customer for their approval. At this time they can change whatever they want on the specification and return it to us. We'll incorporate the change into a revised specification and the resent to the customer for their final approval. A shop order is prepared from the signed off specification and goes to the manufacturing plant. At each individual workstation, Quality Assurance looks over the setup and signs off on the shop order, thereby permitting the machine operator to start on the product. Once the initial operation is completed, it goes on to the next operation where Quality Assurance checks the setup and gives their approval. This is done throughout the manufacturing process. Once the cable is completed, it goes into final Quality Assurance where it's checked for it's electrical integrity, cosmetics, and color. Samples are taken from each reel and put under a video microscope and checked with a color spectrometer.