| Revision as of 20:24, 27 April 2019 editPascal666 (talk | contribs)Extended confirmed users17,486 edits →Types: more than 3 types are listed, and these same types can apply to any type of cable← Previous edit | Latest revision as of 08:54, 7 September 2021 edit undoMakosuke (talk | contribs)74 edits Removed historic comments on PTFE use that aren't really relevant to this article, had no source cited, and described incidents not described in the linked articles.Tag: 2017 wikitext editor | ||
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| {{short description|Type of coaxial cable}} | |||
| {{redirect|RG6|the area of Reading|RG postcode area|the grenade launcher|RG-6 grenade launcher}} | {{redirect|RG6|the area of Reading|RG postcode area|the grenade launcher|RG-6 grenade launcher}} | ||
| {{main|Coaxial cable}} | {{main|Coaxial cable}} | ||
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| ] for television signals]] | ] for television signals]] | ||
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| ''Messenger'' or ''aerial'' may contain some waterproofing but is distinguished by the addition of a steel ] along its length to carry the tension involved in an aerial ] from a utility pole. | ''Messenger'' or ''aerial'' may contain some waterproofing but is distinguished by the addition of a steel ] along its length to carry the tension involved in an aerial ] from a utility pole. | ||
| '']'' wire comes with a |
'']'' wire comes with a Low Smoke Zero Halogen (LSZH) jacket that burns but does not produce toxic smoke. LSZH is typically irradiated PVC. Heating drives off volatiles that leaves the resulting product more heat resistant. | ||
| == Attenuation/signal loss == | == Attenuation/signal loss == | ||
Latest revision as of 08:54, 7 September 2021
Type of coaxial cable "RG6" redirects here. For the area of Reading, see RG postcode area. For the grenade launcher, see RG-6 grenade launcher. Main article: Coaxial cable | This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (November 2020) (Learn how and when to remove this message) |
RG-6/U is a common type of coaxial cable used in a wide variety of residential and commercial applications. An RG-6/U coaxial cable has a characteristic impedance of 75 ohms. The term, RG-6, is generic and is applied to a wide variety of cable designs, which differ from one another in shielding characteristics, center conductor composition, dielectric type and jacket type. RG was originally a unit indicator for bulk radio frequency (RF) cable in the U.S. military's Joint Electronics Type Designation System. The suffix /U means for general utility use. The number was assigned sequentially. The RG unit indicator is no longer part of the JETDS system (MIL-STD-196E) and cable sold today under the RG-6 label is unlikely to meet military specifications. In practice, the term RG-6 is generally used to refer to coaxial cables with an 18 AWG (1.024 mm) center conductor and 75 ohm characteristic impedance.
Applications
A common type of 75 ohm coaxial cable is cable television (CATV) distribution coax, used to route cable television signals to and within homes. CATV distribution coax typically has a copper-clad steel (CCS) center conductor and a combination aluminum foil/aluminum braid shield, typically with low coverage (about 60%). 75 ohm cables are also used in professional video applications, carrying either base band analog video signals or serial digital interface (SDI) signals; in these applications, the center conductor is ordinarily solid copper, the shielding is much heavier (typically aluminum foil, and 95% copper braid), and tolerances are more tightly controlled, to improve impedance stability.
Cables typically have connectors at each end.
Types
Like most cables, RG-6-style cables are available in several different types designed for various applications, including:
Plain or house wire is designed for indoor or external house wiring.
"Flooded" cable is infused with water blocking gel for use in underground conduit or direct burial.
Messenger or aerial may contain some waterproofing but is distinguished by the addition of a steel messenger wire along its length to carry the tension involved in an aerial drop from a utility pole.
Plenum wire comes with a Low Smoke Zero Halogen (LSZH) jacket that burns but does not produce toxic smoke. LSZH is typically irradiated PVC. Heating drives off volatiles that leaves the resulting product more heat resistant.
Attenuation/signal loss
Cables attenuate a signal in direct proportion to length. Attenuation increases with frequency due to skin effect.
| Frequency (MHz) | Attenuation (dB/100 ft) |
|---|---|
| 1 | 0.2; 0.4 for CCS |
| 10 | 0.6 |
| 100 | 2.0 |
| 1,000 | 6.2 |
References
- 'Mike Meyers' CompTIA Network+ Certification Passport', by Glen E. Clark, edited by Christopher A. Crayton, McGraw-Hill, 3rd Edition, 2009, page 32. "Specific coax types were developed for the Ethernet standard, but a number of radio cables have very similar characteristics, and these so-called radio-grade (RG) cables also became associated with Ethernet."
