Posts Tagged ‘ wireless security systems’



Security Camera System Wireless

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Tuesday, September 14th, 2010

A digital video camera security system that does not use video transmission cables is normally referred to as security camera system wireless or a wireless security camera system. These systems offer the greatest versatility in camera installation since it is unnecessary to run an RG-59 coaxial cable from each camera to the Digital Video Recorder or DVR.

A security camera system wireless sends it video image data via radio waves that travel through the air, rather than by electrical impulses that travel along a cable. Most security camera system wireless send their data using 2.4 or 5.8 Ghz band technology, the same sort of technology used by land line based wireless telephones. Not all cameras utilize this technology, some use the 900 Hz or other signal frequency technology while wireless IP (Internet Protocol) ready cameras often use 802.11 WiFi technology.

The wireless camera may not be truly wireless, as a small low-voltage Direct Current (DC) power supply line may be needed to power the camera. This normally comes from a power distribution center that can transform household current into the type needed for several cameras and other equipment on the system. Cameras may also utilize individual plug-in adaptors that plug into a normal outlet and transform the electricity for use by a camera or cameras.

A security camera system wireless is truly wireless when the camera not only transmits its video data without the use of wires, but also when it uses rechargeable battery packs instead of a power supply line. The greatest benefit of these wireless cameras is the incredible versatility for use, including covert surveillance by using hidden or disguised cameras. Of course, the downside to using a rechargeable battery pack is that the power supply of the pack is finite and must be removed and recharged when the there is no longer enough voltage to support the camera.

Wireless cameras have their own on board transmitter and antenna. The camera functions like any other “non-wireless” camera however the on-board circuitry changes the video image data so that it may be transmitted via radio waves. The video data is transmitted to a corresponding wireless receiver, which is normally positioned in proximity to the DVR and is connected to the DVR by cable.

Each camera in a system uses a different frequency or channel so as not to interfere with multiple camera transmissions. Likewise the receivers normally have a selection of frequencies that can be chosen to match the frequency of each camera input (although admittedly confusing, often called channels as well). Receivers may be able to accept one, two, or four different camera signals. Some receivers can actually support 8 different camera signals, although generally multiple receivers with different frequencies selected are used for more than four camera inputs.

Wireless cameras have a range of operation. For most non-WiFi security camera systems wireless, i.e. those that use 2.4 or 5.8 GHz technology, the range is stated in the camera’s specifications as LOS or Line Of Sight. This means a camera with a 400 foot LOS range can operate properly with a distance of 400 feet between the camera and the receiver, provided their is a straight line of sight between the two i.e. without any objects blocking the path. When a camera lists a LOS range, it doesn’t necessarily mean that it won’t work properly if there is something obstructing the path between the camera and receiver. However, the range is normally reduced. Depending on the material or materials that are blocking the LOS (for example walls, windows, buildings, trees, etc.) the range is normally just reduced. Nonetheless, it is important to keep the LOS range in mind when purchasing a security camera system wireless.

IP ready wireless cameras contain their own transmitter technology, web server technology, and antenna. These cameras work a little differently in that they do not necessarily transmit their signals to a security system receiver, but often transmit their signals (already prepared for distribution over the internet) to a wireless modem or router. In these cases the range of operation is dependent on both the specifications of the camera and the wireless router.

A security camera system wireless offers the versatility of “almost anywhere camera placement” with the ease of camera installation. In addition these systems are reasonably priced. If you are interested in purchasing one of these systems talk to one our security experts for more information.

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Wireless 16 Camera Motion Detector Security Systems

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Monday, July 19th, 2010

Wireless 16 camera motion detector security systems are the ultimate solution for digital video camera surveillance and security. The wireless cameras not only provide quick and easy installation, but can be installed just about anywhere. In addition, the motion detection feature provides for conservative storage needs on Digital Video Recorders (DVRs) and if used with the Tilt-Pan-Zoom (PTZ) function can be used to track objects or individuals throughout a camera’s useful field of view.

Typical wireless 16 camera motion detector security systems consist of 16 wireless cameras with motion detection, up to 4 wireless receiver units, one 16 channel standalone DVR unit, and monitor(s). However, there are several variations on this system based on the type of components used and the type of motion detection desired.

Let’s talk about the cameras of wireless 16 camera motion detector systems. The wireless cameras used in these security systems are digital video cameras. These cameras create video images by using one of two special sensor chips. A Charged Coupled Device or CCD or Complementary Metal Oxide Semiconductor (CMOS) sensor chip converts light energy into electrical energy that can be measured and used to produce high quality color (or black and white) video images.

These cameras transmit their video signals using built-in transmitters and antennas to receiver units. Most receiver units can handle up to 4 separate cameras at one time; that is why there may be up to 4 receivers used for a 16 camera system. The signals are normally transmitted over the 2.4 or 5.8 GHz band although there are still some models that may use the 900 MHz band. This wireless technology is basically the same that is used for wireless home telephones.

Wireless 16 camera motion detector security systems may use cameras with different ranges. The range of a wireless camera is based on Line Of Sight or LOS which means the maximum specified range is based on an unobstructed distance between the camera and the receiver. Cameras can still transmit with objects in the LOS but the maximum range will usually be reduced based on the type of material that makes up the object.

Wireless cameras may be indoor or outdoor types. Outdoor cameras are just like indoor models except they are enclosed in a protective case or cover. This cover or case protects the camera from weather and other natural elements from penetrating the case and thereby affecting the camera. These cameras are often rated according to an International Electrical code standard known as the Ingress Protection Rating. Cameras that protect completely from dust and various levels of water penetration are best so look for cameras with IP66 or IP67 ratings.

The cameras used in wireless 16 camera motion detector security systems may also be day/night vision cameras or night vision infrared cameras. Day/night cameras have very sensitive sensor chips that produce high quality color video with very little available visible light. Night vision infrared cameras produce high quality color video in conditions with visible light and high quality black and white video in total darkness by using infrared illumination.

Other options for these cameras include audio recording, pan-tilt-zoom, and hidden or disguised cameras.

Wireless 16 camera motion detector security systems may actually implement the motion detection function by one of two ways. The first method is by a motion detector sensor that is mounted directly on the camera or is a part of the camera case or mount. These cameras use something known as a Passive InfraRed or PIR sensor. The sensor works by detecting the changes in infrared radiation light in its field of view. Once a change is detected, an assumption is made that motion has caused this sudden change, and the PIR triggers a switch that turns on the camera or initiates recording video for a camera that is already on.

The second method of motion detection lies within the programming of the processor/DVR unit. These units can contain programming in the form of software or as hard wired programming that can detect movement in the camera’s field of view. This type of motion detection can be incredibly useful when used with PTZ functions because the camera can be programmed to literally track the movement of an object or an individual. These cameras are often used in parking lots and retail stores.

Wireless 16 camera motion detector security systems are the ultimate security system because of versatility, ease of installation, and affordable price. Check with our digital security experts to get your system today.

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Multiple Camera Wireless Security Systems

Written By:
Wednesday, July 7th, 2010

As people discover the benefits of multiple camera wireless security systems, they are becoming ever more popular. Innovative technology has provided additional optional features for these systems making them incredibly versatile in application without making prices skyrocket. In fact, multiple camera wireless security systems can actually save you money by eliminating or keeping security department staffing at a minimum.

There are numerous applications for wireless security systems. Industries, business, offices, retail stores, gas stations, schools, churches, and residences are just a few of the possible applications for these systems.

Since the cameras are wireless, it means that there are no transmission cables. Digital video surveillance cameras normally transmit their video signal over some sort of cable, usually a coaxial cable. This cable carries the signal from the camera to the processing unit or Digital Video Recorder (DVR) and each camera must have a cable installed in this manner. For some applications, these cables can be unsightly or difficult to install.

Multiple camera wireless security systems do not require this cabling for the video data. Instead, these cameras have built in transmitters and on-board antennas that send the video data via radio air waves totally eliminating the transmission cables. Most cameras take advantage of the newer 2.4 or 5.8 GHz technology (the same type used with wireless home telephones) available today to send their video signal to a receiver unit which is normally located in close proximity to the DVR.

Using wireless cameras has several benefits. Since the video transmission cable is eliminated, the cameras are much easier and quicker to install. Just mount the camera and plug in the power supply and the cameras are ready to go. In addition, wireless cameras can be mounted in places that cameras with cables may not be able to be placed. Further, wireless cameras are much easier to disguise or hide if necessary for applications that require covert surveillance monitoring.

The camera numbers and types for multiple camera wireless security systems can be “mixed and matched” for each system as well. Each camera can differ in functions and features that are needed for its particular monitoring area and still be combined to operate in tandem with the rest of the system. In addition, systems can have as few as one camera and as many as 16 cameras for each DVR. The maximum number of cameras that can be used is actually limitless. As additional cameras are added, additional receivers, processors, and DVRs can be added to accommodate them.

The digital video cameras of multiple camera wireless security systems transmit their video signal using Line Of Sight or LOS radio wave technology. LOS means that the maximum range stated for a specific camera and receiver pair is based on an unobstructed view between the two. The cameras and receivers will continue to function if an object is blocking the LOS but the maximum range will be reduced. This is generally not a problem as the range for these cameras is normally significant enough to overcome most obstacles. Some wireless cameras boast LOS ranges of up to two miles.

Here are the basics of how a multiple camera wireless security system works. The digital video camera captures video images and transmits them as radio signals to a receiver using a built in transmitter and antenna. Most receivers can handle the simultaneous reception of 4 cameras but there are receivers that can handle even more. Once the receiver has established the cameras’ signals it changes them into electronic signals and passes them on to the processor/DVR unit.

The processor interprets the video signal and creates a digital video file of the signal. Most digital video files are extremely large in size because a digital video is actually a series of individual digital photographs. These large files are difficult to process, handle, and store so most units use a compression utility to reduce the files’ size. The key to the compression utility is that although it makes the file size smaller it still maintains a high degree of quality for the video image.

The smaller, easier to handle digital video file can be viewed in real-time (live) or stored on the DVR for later viewing or archival purposes. Some systems include a DVD recorder so that portions of the video may be copied and viewed elsewhere.

Multiple camera wireless security systems are being used today in a variety of applications for businesses and homes alike. These systems are simple to install and use and are affordably priced.

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