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Cable impedance is one of the characteristics that define how the cable will transmit signals. There are some simple and some far more complex descriptions of transmission lines on the internet that describe the feature in more detail.
For the normal user, it is sufficient to know that video signals over co-ax cable will use 75 ohm cable. Most data signals that use co-ax cable will use 50 ohm cable. Generally, the source of the signal will have an impedance equivalent to the characteristic impedance of the cable. Similarly, at the end of the cable, the same value of impedance is needed.
When the cable is terminated properly, the signal will be transferred to the end of the cable without it reflecting back down the cable. It is the reflections that cause ghost images or smearing on a television image. As the length of cable increases, it becomes more important to make sure the correct impedance of cable is used with the correct termination.
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What is Transfer-impedance?
transfer impedance is impedance we encounter when an electrical current passing through one element of the system makes a voltage difference in other element of same system. eg:shield in a coaxial cable
Characteristic impedance of coaxial feeder proportional to its length inversely proportional to its length or constant to its length?
The characteristic impedance of a coaxial feeder doesn't depend on its length.The number is printed on the jacket of the cable, and applies equally to a1-meter section or a 500-meter section.The effective impedance of a coaxial feeder depends on its length if it's not terminatedin the characteristic impedance. The relationship is not a simple proportion, and thisimpedance is a complex quantity.
What is 75 ohm?
Ohms are a measure of resistance to electric current.You're probably talking about a 75 ohm coaxial cable. In this case, 75 ohms is the characteristic impedance of the cable.
What is use coaxial cable?
Uses of Coaxial Cable?
Is cable coaxial the same as satellite coaxial?
Most times they are the same but a satellite signal needs to be carried by RG6 cable it is a heavier gauge wire then say RG59. Regular or analog cable signal is sometimes carried by RG59 but digital cable should use RG6. +++ The primary specification is not conductor size but the impedance and capacitance of the cable.
What is transfer impedence?
transfer impedance is impedance we encounter when an electrical current passing through one element of the system makes a voltage difference in other element of same system. eg:shield in a coaxial cable
What are the disadvantage of coaxial line?
coaxial cable speed is slower than fiber optic cable. it is main disadvantage of coaxial cable
What is slower coaxial cable or optical cable?
Coaxial one.
The center of a coaxial cable is called what?
the center of coaxial cable drrrrrrrrrreinstein
How many wires are in coaxial cable?
how many wires does a coaxial cable have
What type of cable is an cable modem used for?
You should use an RG-6 cable RG-6 A type of coaxial cable with an impedance of 75 ohms and that contains an 18 AWG core conductor. RG-6 is used for television, satellite, and broadband cable connections. Source = Network+ Guide to Networks (Fifth Edition) by Tamara Dean
Attenuation of coaxial cable?
It is the loss of data from the coaxial cable during transmission .
