Why is the cable of aluminum foil shielding or foil material not applicable to TV monitoring system?
Because of aluminum foil shielding or foil material, the real name is radio frequency cable, used for cable television or radar communications. The cables used for monitoring systems are called video cables.In the actual installation of the application, the market of SYWV (cable) in general, the shielding net in quality and technical requirements will be made relatively poor, shielding performance (anti-jamming) is relatively poor, if used for closed-circuit television monitoring for long wire transmission easier to introduce interference. The manufacturer knows, cable television transmission signal mainly depends on the modulation and demodulation device, the signal can be adjusted in a certain frequency band, can effectively avoid the interference signal, the signal source of CATV transmission is the satellite receiving station, is a very high in the room, midway is also equipped with a trunk amplifier, strong signal what; closed-circuit television monitoring? Its signal source is just a camera. So for SYWV video line cable TV for reasons of cost control reasons or technical requirements, will not be too focused on shielding performance or unnecessary on cable TV lines, will naturally take processing technology made of copper shielding net, a little thinning thinner or using non copper shielding net (such as copper and tin the old copper copper or other metal etc.).
TV video uses 0-6MHZ low frequency cable and you say
For SYV video TV monitoring on the line, because the closed-circuit television monitoring system generally adopts the point-to-point direct transmission of the video signal, no external modulation device, its shielding performance (anti-jamming) is mainly rely on the shielding net, so the shielding performance of the SYV video line (anti-jamming) from both quality and technology have more stringent requirements, from technology to discuss and consider the shielding net SYV video line made a dense wire rod manufacturers, weaving more reasonable and full use of materials, in order to ensure the shielding of the closed-circuit television monitoring system can (anti jamming performance), SYV video line continuously according to the practical application to improve the improvement, this is usually the nominal implementation of the enterprise standard factory".In addition, television surveillance video signals are baseband transmission, and point to point transmission in the same frequency bandwidth requires better shielding!! Stronger anti-interference ability!! Cable TV has better performance in this area than video lines. Therefore, the video line is recommended for television monitoring, instead of using an aluminum foil shielding line.
