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COAXIAL CABLES
What is Coaxial cable?
Coaxial cable is a type of transmission cable with low signal interference. Coaxial cable consists of a center copper conductor surrounded by a plastic shield which in turn surrounded by a braided shield and all these 3 layers protected by an insulation cover.
Plenum and Non-Plenum cables
· Actually, Plenum is referred to space in a multi-story building between the ceiling of one story and floor of the next. Plenum gets its name from an HVAC term.
· Plenum cables are Teflon cables which ensure lower emission of toxic than PVC cables when fire accidents happen in the concerned building. Coaxial plenum cables have FEP (Fluroethylenpropylene) outer cover which is commonly called as Teflon covering.
· Non-Plenum cables are PVC cables which are not fire resistant. In fact, Non-Plenum cables help the fire to spread quickly when fire accident happens. Also, Non-Plenum cables emit poisonous smoke when burnt.
· Non-Plenum cables should not be used in a plenum area inside the building. But it can be used other areas where it is safe.
· Non-Plenum cables are less expensive compared to plenum rated cables.
Why is it called coaxial cable?
Because the inner core line which carries signals and the outer braided line which is grounded, both running along the same axis. As you know, these two lines are separated by a plastic shield.
What is the coaxial cable used for?
1. Coaxial cable is used in cable TV connections.
2. Also used by telephone companies to connect central offices to telephone poles near customer sites.
3. Coaxial cables are used to connect Radio transmitters and receivers to their antennas.
4. Coaxial cables are used in digital audio (S/P DIF).
Coaxial Cable types (only a few)
Only RG-6 and RG-59 are widely used now. RG refers to Radio Grade
RG Rating
|
Common Name
|
Ethernet
|
Common Applications
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RG-58 A/U
|
Thinnet
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10Base-2
|
Not used now
|
RG-8
|
Thicknet
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10Base-5
|
Not used now
|
RG-59
|
Cable Television cable
|
-----------
|
CCTV cameras, TV & radio antennas
|
RG-6
|
CATV Coax
|
-----------
|
Industry standard for cable, satellite & Internet
|
RG-62
|
ARCnet
|
------------
|
Not used now
|
Coaxial cable advantages
· Coax cables are less expensive than fiber optic cables.
· Coaxial cables are easy to install and durable.
· High resistance to electronic signal pollution such as EMI, RFI, and other stray electronic signals.
What is an RG6 coaxial cable?
Generally, RG-6 cable is a type of coaxial cable with an 18 AWG (1.3mm) conductor in the center and 75-ohm impedance which is best for high frequency (above 50 MHz) or high bandwidth applications such as Internet, Satellite TV, and Cable TV signals. The most common variety of RG-6 is CATV distribution coax which is used to route cable TV signals to and within homes. Rg-6 uses aluminum braid.
RG-59 cables are used for low frequency (Under 50 MHz) or low bandwidth applications such as CCTV installations. In Security camera installations, RG-59 cable merged with a 2C power cable can be used which carry the power and video for your CCTV cameras simultaneously. RG59 uses copper braid.
What is coaxial Quad shielding?
Shielding reduces signal loss to protect your signal quality. There are 3 types of shielding, single, dual and quad. Quad shielding has 4 layers of shielding. RG-6UQ is a quad shielded coaxial RG6 cable.
Coax cable data sent as electrical signals in different frequencies.
Coaxial cable connectors
· F-connectors and N-connectors
· Compression connectors
· Screw-on connectors
· Crimp-style connectors
Tips for coaxial cable wiring installation
· Select the appropriate type of coaxial cable required
· Avoid sharp bend while laying the Coaxial cable using an F-Type or 90-Degree adapter.
· While stripping, avoid Coaxial cable stingers (Tiny wires of the braid touching the center conductor). Use a coaxial cable stripping tool.
· Use compression connectors of coaxial cable. Avoid crimp-on, screw-on, and push-on connectors. Crimping tools are available at lesser price.
· Use the connector with the higher frequency rating.
· Lay Coaxial cables perpendicular to electrical cables.
· Use Quad shield cable
· Avoid cheap coaxial splitters.
Coaxial cables, Connectors, Installation kits and Testers---------
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