Posts Tagged ‘ Wireless Camera Security System ’

Infrared Wireless Camera

Wednesday, June 15th, 2011

You may be wondering what an infrared wireless camera is.  It is a digital video camera that can capture digital video images in total darkness and does not require a coaxial video transmission cable run from the camera to the Digital Video Recorder or DVR.

Let’s start at the beginning.   A digital video security and surveillance system normally has three basic parts or components:  The camera(s); the DVR; and, the monitor(s).  It’s the camera that we are interested in so lets talk about how it works and what it does.

Unlike the infrared wireless cameras, most cameras need some sort of connection wire to send their video data over to the DVR.  Most often, this wire is actually RG-59 coaxial cable.  The signal originates at the camera end and terminates at the DVR end.  There is nothing wrong with this method; in fact this is the way most security systems are set up.  However, if you want to avoid running all that cable, then you may want to consider a wireless camera.

The wireless camera helps to avoid all the time and effort it takes to run the RG-59 cable.  Imagine that you want to install a gate camera at the end of a very long driveway.  Can you imagine the cable run through your house all the way out to that camera at the gate?

On the other hand an infrared wireless camera has its own on-board transmitter and built-in antenna so that it can send the video data to the DVR in radio frequency format instead of cable.  Actually the camera sends the radio transmission to a corresponding receiver made specifically for this purpose.  The receiver is then connected to the DVR by a coaxial cable and relays the camera’s signal to the DVR via this short cable.

The camera at this point is not truly 100% wireless.  All cameras must have some sort of power supply and so a power supply line must be run to the camera.  In this situation, this can still be a bit of an advantage at making installation easy because a single plug-in type transformer, made specifically for the camera can be plugged in to an outlet nearest the camera reducing the power supplies’ cabling run.

A truly infrared wireless camera can be achieved with very little effort.  This is probably the most desirable configuration because there are absolutely no wires or cables that need to be run from the DVR to the camera.  There are many infrared wireless cameras available from Security Camera King that obtain their power supply from on board batteries.  This makes the camera truly wireless.

When purchasing a wireless camera, make sure you know how far (usually in feet) that your camera will be separated from the receiver.  Most cameras employ a wireless transmission type where the maximum range is stated based on Line Of Sight or LOS.  That means that a camera with a wireless range of 300 feet has that range based on LOS.  If there are any objects between the receiver and the camera you could loose the signal entirely, although this is rare.  Generally, depending on the amount and material the radio signal must go through it simply reduces the camera’s range.

The other half of the infrared wireless camera, that is the infrared portion, allows the camera to see in total darkness.  The camera lens focuses the field of view onto a small (usually 1/4 to 1/3 inch square) sensor that when struck by light energy emits electrical impulses that can be measured and used to create an electronic reproduction, or video footage.

The chips that are used are the Charged Coupled Device (CCD) and the Complementary Metal Oxide Semiconductor (CMOS).  Both the CCD and the CMOS have the inherent ability to react not only to the visible light spectrum but they can also see the near red infrared light spectrum (human eyes cannot see this type of infrared radiation–simply put it is invisible to us).

An infrared wireless camera is usually supplemented with an array of InfraRed Light Emitting Diodes (IR LEDs) positioned around the lens.  This is like using a floodlight on a non-infrared camera.  Additional illuminators can be purchased to extend the distance of the camera.

An infrared wireless camera not only has a transmission range, but it also has an Infrared range distance.  Make sure to check the infrared range on the camera before purchasing it as well.


Security Camera System Wireless

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.