Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint, or mesh wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and convenience stores.
Strategy Location or Tips on fitting CCTV to a house.
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The prospect of drilling holes through the external walls of your home to run the power and video cable for a camera may at first seems only feasible for the most accomplished DIYer.
With a little forethought it can be remarkably simple.
Positioning of camerasMost people want to make the camera position as discreet as possible. The modern bullet-type camera is no bigger than your small finger in length and can easily be located under or on the fascia/soffit boards where the roof line meets the wall. This location also provides good shelter from wind and rain and can be shaded from excessive sunlight. The height of the camera position will give a good area of view and minimise the risk of vandalism. However, another advantage of this location is cabling. It is usually easy to run the cables into the loft from this position. Many houses have a small ventilation gap between the roof tiles and the external wall, or a small hole may be drilled in the fascia board to gain access to the loft.
Cabling
It is usually easy to pick up mains power in the loft or at least if additional cabling is required it is now internal. Wireless transmission can be used for the video signal with the receiver being placed next to the monitor or recorder (TV, VCR, PC etc.). That's it, installation complete. A hard-wired system can almost be as easy to install. Locate the TV aerial down-lead that may be in the loft or run down the outside of the house. It is usually possible to run the CCTV camera video cable alongside the aerial cable, which will lead directly to the TV. A neat method of connection is to use an RF modulator. This little box changes the camera's video output to an RF output. This means you can pipe the CCTV images down the existing TV aerial down-lead and view on the TV/VCR as if it were another channel. If the house is fitted with a TV aerial distribution system, this method of connection allows the camera pictures to be viewed on all TV sets.
Addition of Switchers etc.
Consider placing switchers, mutiplexers or DVRs in the loft. This contains all the camera cabling in the loft with just one output cable to a monitor. It also hides away the recording device.
Other ideas
Consider positioning the cameras indoors. Point each camera at the exterior doors. Use a motion detector or PC-based system to activate the camera when a door is opened.
The advantage of this type of system is that you do not need a traditional burglar alarm and sensors. The output of the system can be connected to an alarm or, better still, the more sophisticated methods of dialing/SMS to your mobile phone.
This method avoids activation of the motion detector by sudden changes in light levels. Set the activation area just above the level of the cat flap to allow freedom of passage for your pets.
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