What's a coaxial cable?

Question

At home, I have a TV, DVD player and Freeview box. The TV only has one scart connection at the back, so I currently have to swap the scart lead when I want to change from Freeview to DVD or vice versa. I got an adaptor which is supposed to take 2 scart leads, but it doesn't really work.

A friend told me I should get a coaxial cable. I don't really know what that is, or how it would help! Can anyone enlighten me?

Thanks!

Answer 1

In that context, it's a link wire to 'daisy chain' the aerial cable or signal through from eg. the Freeview box to the TV (or use two to link the Freeview to the DVD, then from the DVD to the TV).



Most TV gear with two aerial connectors (usually one male & one female) will have a Modulator built in, which is a mini-transmitter that adds that device's output to the signal on the aerial link to the next device. You tune a spare channel on the TV to find the signal from the freeview box (or whatever), then use that channel rather than the Scart AV input.



The big problem with that is the quality is not as good as a Scart connection, and you lose any Stereo on whatever you are watching.



Does the TV have any other AV input on it, such as three phono sockets (Red, White & Yellow)? You can get a Scart adapter or cable from a scart plug to the three phono style & use that for one of the external devices.



Alternatively, does the Freeview box have two Scarts? Most newer gear has auto switching built in & if you connect the DVD to the Freeview box second Scart, it will route that through to the TV when you start a DVD playing.

Answer 2

A co-axial cable (sometimes called co-ax) is a cable which has a copper or aluminium wire surrounded by a plastic sheath. A copper or aluminium braid is wrapped around the plastic sheath. The plastic sheath insulates the wire from the braid. There is always a plastic cover running over the whole length of the cable.



Your ordinary television aerial wire is a good example of a co-axial cable. Electric guitar to amplifier leads and most microphone leads are also co-axial.



What is wrong with your SCART adaptor? It's probably that the two inputs are interfering with each other and so you don't get a good result. Or it's just because it's a cheap one that's bad anyway.

You can buy SCART combiner boxes which have switches on them to select which of the inputs that you want to use at a particular time. They're about £10 and work very well.

Answer 3

a coaxial cable is a ariel cable, it's usually round and has a round connector at the end.



i dont think it would help in your situation.



if any of the other devices have 2 scart leads you could just plug one into that.



i had my freeview box scart into the Video, then the video scart into my DVD player and then the DVD into the TV. but they all have to be plugged in (have power not switched on) in order for them to work on the TV.



if your TV has 3 round sockets (red white black) you could buy a scart to composit which you would just plug the scart into one of them, and then the 3 wires into the tv for the 2nd connection.

Answer 4

Coaxial is the standard in cable delivery for like 30 + years. It has a low voltage copper wire in the center, with a plastic insulated coating, then there is aluminum wrapped around the insulated layer to prevent interference and that is covered in another layer of plastic type insulation. The fittings are threaded so they can be screwed together with male and female ends.

Answer 5

Leave the modem where it is. The modem, in essence, is a converter between the co-ax to an RJ45. And I think you've misjudged the size of the ports in the back of the routers you've seen, like I do all the time. Most, if not all, routers today have RJ45 connectors in the back and RJ45 connectors in the front. What you want to do is: Wall --- Modem --- Router --- Computer, not Wall --- RouterInsteadOfModem --- Computer.

Answer 6

You remain and read a e book and the characters unfold in that vast landscaping which is your brain and thoughts and the scope is hundreds, literally a huge selection of times higher than the miserable Television world

Answer 7

I don't think t.v. is a waste of their time, it's just that I see no real use from it nowadays and there is nothing at all educational or rewarding on now. Children of today are exposed to 'entertainment' that is merely plain stupid and has no morale meaning behind them

Answer 8

Coaxial cable, or coax, is an electrical cable with an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by a tubular conducting shield. The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis. Coaxial cable was invented by English engineer and mathematician Oliver Heaviside, who first patented the design in 1880. Coaxial cable is used as a transmission line for radio frequency signals, in applications such as connecting radio transmitters and receivers with their antennas, computer network (Internet) connections, and distributing cable television signals. One advantage of coax over other types of transmission line is that in an ideal coaxial cable the electromagnetic field carrying the signal exists only in the space between the inner and outer conductors. This allows coaxial cable runs to be installed next to metal objects such as gutters without the power losses that occur in other transmission lines, and provides protection of the signal from external electromagnetic interference.



Like any electrical power cord, coaxial cable conducts AC electric current between locations. Like these other cables, it has two conductors, the central wire and the tubular shield. At any moment the current is travelling outward from the source in one of the conductors, and returning in the other. However, since it is alternating current, the current reverses direction many times a second. Coaxial cable differs from other cables because it is designed to carry radio frequency current. This has a frequency much higher than the 50 or 60 Hz used in mains (electric power) cables, reversing direction millions to billions of times per second. Like other types of radio transmission line, this requires special construction to prevent power losses.



A coaxial cable is one that consists of two conductors that share a common axis. The inner conductor is typically a straight wire, either solid or stranded and the outer conductor is typically a shield that might be braided or a foil.



Coaxial cable is a cable type used to carry radio signals, video signals, measurement signals and data signals. Coaxial cables exist because we can't run open-wire line near metallic objects (such as ducting) or bury it. We trade signal loss for convenience and flexibility. Coaxial cable consists of an insulated centre conductor which is covered with a shield. The signal is carried between the cable shield and the centre conductor. This arrangement give quite good shielding against noise from outside cable, keeps the signal well inside the cable and keeps cable characteristics stable.

Most common coaxial cable impedances in use in various applications are 50 ohms and 75 ohms. 50 ohms cable is used in radio transmitter antenna connections, many measurement devices and in data communications (Ethernet). 75 ohms coaxial cable is used to carry video signals, TV antenna signals and digital audio signals. There are also other impedances in use in some special applications (for example 93 ohms). Different impedances have different characteristics. For maximum power handling, somewhere between 30 and 44 Ohms is the optimum. Impedance somewhere around 77 Ohms gives the lowest loss in a dielectric filled line. 93 Ohms cable gives low capacitance per foot. It is practically very hard to find any coaxial cables with impedance much higher than that.

Answer 9

If you google search coaxial images you should get a good idea what it is, it's your basic cable antenna hook up. Used in days of yore.

Answer 10

its an ariel wire