Posts Tagged ‘coaxial cables’


What are RF Cables and How Do They Work

 

RF Cable

RF Cable

By Anne Ahira

All connections to the world pass through a series of wires and connectors. These wires are the veins from which the life of our modern world flows forth.

Like veins, there are different wires to perform different tasks. The most common, and most important is the RF cable.

This multifunctional cable is used all over the world for a wide range of uses, from internet connections to television.

“RF” stands for radio frequency and this kind of cable is most common in telecommunications and networking, and is commonly used in the transmission, as well as reception, of radio and television signals, as well as cellular phone and radar systems.

RF cables are the same as coaxial cables. They provide certain characteristics for electrical resistance ensuring that the cables match the electronic systems for the largest amount of power transfer with the smallest amount of signal reflection.

Essentially, what that means is that the amount of interference when using a coaxial RF cable is less then when using other types of cables. The coaxial RF cable is preferred for use with internet connections, as well as cable television and phone systems because the interference from other frequencies is lower.

Coaxial RF cables are made using very specific dimensions and exact materials. They are typically manufactured using a copper conductor that is separated by polyethylene from braided pairs, is covered by a PVC jacket to protect the copper wires, and all of these elements share a central axial line.

RF cables come in different qualities. Though most cable companies use RF cable, even their equipment can be faulty. If you notice that your television is not showing the highest quality image, it may be the cable itself.

You may need a higher quality coaxial RF cable then what was installed. There are different qualities of RF cables and some can cause issues with interference in the signal, called attenuation. This attenuation is relative to static noise on a telephone.

There are also times when some cable companies may install a lower grade cable because that is the kind of cables they use. You can usually upgrade the cable at a fairly low price without even leaving your living room.

You can order these cables, as well as do-it-yourself books, online from different companies including Amazon. Amazon has a wide variety of RF cables that can fit your needs. At Amazon, you can look at the reviews for each individual item and find what you are looking for.

However, if you do prefer to drive to a store, you can also purchase RF cables at hardware and electronic stores. So, no matter what your needs may be, you should be able to find what you need quickly and without extra cost.



COAX CABLE

Coax Cable

Coax Cable

By Anne Ahira

Coax cable is sometimes referred to as its full name coaxial cable but most people use the shortened version, coax. It is an electric cable that has an inner conductor, which is then surrounded by a tubular insulating layer.

Ordinarily the flexile material that is used as a surrounding for the conductor is actually a conductive layer. That is characteristically either fine woven wire that will be useful because it’s so flexible, or sometimes it is a thin metallic foil. Regardless of which is used, it will be finished with a thin insulating layer right on the outside of the cable.

Actually the term coax cable comes from the outer shield and the particular inner conductor being able to share the exact identical geometric axis. Coaxial cable has been used primarily with computer network or Internet connections, in transmissions such as having to connect radio transmitters and/or receivers to their antennas, the distribution of cable television signals, or as a transmission line to send and receive radio frequency signals.

The largest benefit of using coax cable instead of other types of transmission lines is found in the properties of coaxial cable. You see in a “perfect” coaxial cable the electromagnetic field that carries the signal will exist only in the space found between the outer and inner conductors.

Thus, the coax cable “runs” may even be installed directly next to metal objects, such as a gutter, without suffering the power loss that will occur when using other transmission lines. In this manner, using the coaxial cable will provide a complete protection of the particular signals that can ordinarily come from external electromagnetic interference.

Readers need to be aware that there is a distinct difference between other shielded cables that carry lower frequency signals such as audio signals, and coax cable. There is a definite similarity between shielded cable and coaxial cable in that shielded cable will consist of a central wire, or perhaps a number of wires, that will be surrounded by a tubular shield conductor. However, shielded cable is not constructed using the very precise conductor spacing that is needed to function proficiently as a radio frequency transmission line.

The exact coax cable design choice will affect a number of items such as strength and cost, flexibility, power handling capabilities, attenuation, and frequency performance as well as affecting physical size. Its inner conductor may be solid or stranded, although stranded is much more flexible. In order to be able to receive improved high-frequency performance, sometimes the inner conductor will have been silver-plated. At times even copper-plated over plain iron wire will have been found to being frequently utilized for an inner conductor.

Sometimes the insulator that surrounds the inner conductor might be made of solid plastic, or a foamy type of plastic. It may even be made with air with spacers that support the inner wire. Ordinarily flexibility is a definite necessity but the majority of cable television (CATV) distribution systems will use what’s called “hard line” cables, meaning that the inside, the shield, may even be a solid wire as they will provide a lower signal loss.

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