Knowledge of wireless surveillance cameras
Wireless security camera are closed circuit cameras (CCTV) that transmit the video and audio signal to a wireless receiver over a radio range. Many wireless surveillance cameras require at least one cable or wire for power; The word “wireless” refers to transmitting video, audio. However, some wireless security cameras are battery powered, which makes the cameras truly wireless from top to bottom.
Wireless cameras have proven to be popular among modern security consumers due to their low installation costs (there is no need to run expensive video extension cables) and flexible mounting options; Wireless cameras can be parked in locations that were not previously available for standard wired cameras. In addition to ease of use and ease of access, the wireless security camera allows users to take advantage of wireless broadband internet to provide seamless streaming of video over the Internet.
Types of wireless cameras
Analog wireless is the transmission of audio and video signals using radio frequencies. Typically, the analog wireless transmission range is about 300 feet (91 meters) in an open space; Walls, doors, and furniture will reduce this range.
Analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz. Currently, the majority of wireless surveillance cameras operate at a frequency of 2.4GHz. Most home routers, cordless phones, video game controllers, and microwaves operate at a frequency of 2.4GHz and may cause interference with a wireless security camera. The main difference between the 2.4 and 5 GHz frequencies is the range. 900MHz has been known to penetrate barriers such as walls and plants. “Citation needed”
Cost Effective: The cost of single cameras is low
Multiple receivers per camera: The signal from one camera can be captured by any receiver; You can have multiple receivers in different locations to create your own wireless monitoring network.
Subject to interference from other household appliances, such as microwaves, cordless phones, video game controllers, and routers.
No signal strength indicator: No visual alert (like bars on a cell phone) indicating signal strength.
Vulnerable to Interception: Since analog radio uses a fixed frequency, it is possible that the signals will be picked up by other receivers.
One-way communication only: The receiver cannot send signals back to the camera.
Wireless digital cameras
Digital wireless is the transmission of analog audio and video signals encoded as digital packets over high-bandwidth radio frequencies.
Wide transmission range – usually close to 450 feet (open space, clear line of sight between camera and receiver)
High-quality video and audio
Bi-directional communication between the camera and the receiver
The digital signal means you can send commands and functions, such as turning the lights on and off
You can connect multiple receivers to a single recording device, such as a security DVR
Uses and applications
Home security systems
Wireless security cameras are becoming more and more popular in the consumer market, they are a cost effective way to get a comprehensive home or business surveillance system at a much lower price often. Wireless cameras are also ideal for people who rent houses or apartments. Since there is no need to run video extension cables through walls or ceilings (from camera to receiver or recording device), one does not need owner approval to install a wireless security camera system. In addition, the absence of wires reduces clutter and avoids damage to the appearance of the building.
The wireless security camera is also a great choice for seasonal surveillance and monitoring. For example, one might observe a swimming pool or a patio.
Wireless cameras are also very useful in monitoring outdoor buildings as wireless signals can be sent from one building to another where the wires cannot run due to roads or other obstructions. One of its common uses is to see animals in a barn from a house located on the same property. An example of this can be seen in this story by one of the first Barn Cam in the New York Times.
Law enforcement agencies also use wireless security cameras to deter crime. The cameras can be installed in many remote locations and only video data is transmitted over a government wireless network. An example of this application is the deployment of hundreds of wireless security cameras by the New York City Police Department on street lighting on many streets around the city.
Wireless security cameras work best when there is a clear line of sight between the cameras (s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, their range is usually between 250 and 450 feet. If the range is indoors, the range can be limited to 100 to 150 feet. Cubic walls, drywall, glass, and windows generally do not reduce wireless signal strength. Brick, concrete floors, and walls reduce signal strength. Trees in the line of sight of the wireless camera and receiver may also affect signal strength.
The signal range also depends on whether there are competing signals that use the same camera frequency. For example, signals from cordless phones or routers may affect signal strength. When this happens, the camera image may freeze, or appear “choppy”. Usually the solution is to lock the channel the wireless router is on.