Attenuation



Attenuation is a reduction in an electrical signal usually because of absorption, scattering or interference.

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It is also a key specification for all coax cables. The function of the cable is to transfer radio frequency power from one point to another. In CCTV systems the power output of the analog signal at the camera will have to remain the same in order to have a usable image at the other end of the cable. It is often referred to as 1 volt peak to peak at 75 ohms. The typical distance for a good signal for an analog CCTV system from the camera to a DVR is about 800 feet for RG59/U cable.

Handling of the cable is very important. If the cable is bent too much it can be damaged and cause leakage of the signal. Coax cable is also sensitive to electromagnetic interference from machinery or power lines.

You can find more information about connecting a CCTV system on our CCTV Connectivity page.

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