Comcast uses a 75 ohm coaxial cable.
A coaxial cable is a common type of data communication cable. There are many different types of coaxial cables. In hooking up a Comcast cable box, the Comcast manual specifies that you need a 75 ohm coaxial cable with F-type connectors.
Features
Ohm is the unit of measurement used to indicate the amount of resistance acting upon an electric current as it flows through a circuit. F-type connectors are screw-on connectors.
Other Considerations
Another thing to consider is the RG value of the coaxial cable---such as RG-6. RG stands for Radio Guide. The value that follows it is a reference to the diameter and internal characteristics of that particular type of coaxial cable. Comcast does not specify a standard RG value for the best type of coaxial cable to use with their products.
Common Coaxial Cables for Cable TV
RG-6 and RG-59 are two common types of coaxial cables used in homes for cable TV.
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