CCTV Noise Interference

CCTV Noise Interference

Installing CCTV is necessary in most commercial and many of the higher story buildings, mostly for security purposes and occasionally for some other purpose. The device is very effective when used optimally and care must be taken to prevent any interference on the situation. Many of the transmission mediums will have their nemesis in different applications. Heat source even like an air-conditioning machine, mechanical disadvantages like twists and turns or kinks, other wave sources transmitting video images and in nearly same frequency are some of the difficulties which an operator should bother about so that there is clear and precise video and audio transmission. We will discuss the possible noise sources and how they can be countered to provide best picture quality and quick image uploading.

Electromagnetic interference

Whenever there is transmission through electromagnetic waves it is natural to encounter other transmission in electromagnetic range. Since all these waves have a circumscribing magnetic field around them naturally they will try to influence other magnetic fields generated by other transmissions. The two together will spoil each transmission from achieving their optimum utility. If the transmission is not completely stopped the noise in the form of white grains or snowing or dark lines on the video can appear. For this reason only it is not possible to have CCTV transmission lines beside electrical supply lines and this is very vital while installing the lines. This is mostly for coaxial cable transmission and even with electronic filters this interference can’t be completely eliminated. Most of the filters are for some selected range of frequencies and not for the complete spectrum. Some band pass filters which will only pass the frequency of the CCTV can have better effect than most other filters. There are not many remedies for this other than careful installation and filters.

Coaxial cable Mechanical disadvantages

The electromagnetic circuit has variable resistance called impedance and this depends on the frequency of transmission of the wave. In such situation the material of the coaxial cable and frequency of transmission together can create certain situation of low resistance and high flow. If this is not pre thought out this can also have effects. The impedance is a critical property and with twists and turns can generate more resistance to the cable. This is an adverse situation and will also obstruct the optimum flow of wave. Similarly the distortions of the cable will have changed magnetic field and even will mutually work against the field of the rest of the cable. This will cause inherent obstructions in the cable and resulting noise. Every noise has different magnification on the screen and there are even interferences from storms and lightening.

CCTV Installation attention

The coaxial cables should be installed for transmitting decent video quality away from any source that can create electromagnetic interference. Heat source, electrical high tension wires or mains, regular fixing of the cables to avoid any mechanical changes to affect the transmission are some of the better ways to counter the noise of CCTV. This is mostly for surveillance and there should neither be delays in transmission nor deterioration of quality at point of time. For interferences of nature there are very few options available as remedies. The other caution is regarding damaging of lines by regular use or animal causes like rats. The lines put at a height are better suited to accommodate these adversities and overcome them.