Advances in digital technology COFDM offer increasing possibilities of movement of the camera and the receiver, as well as better results in the quality of the transmitted images.

Professional wireless and broadcast cameras are one of the great innovations in the area of ​​technology and streaming video. To achieve these multiple applications, all that is needed is to place a transmitter and antenna at the exit of the chamber and a receiving antenna on the site where it is required to monitor or rebroadcast.

Until the beginning of the century, the wireless signal transmission from the camera only achieved using microwave technology with analog FM. In 2001, the manufacturer Broadcast Microwave Services, BMS, launched COFDM digital technology products for wireless cameras, making it a pioneer of this technology. Carry Coder products, Truck and Heli Coder Coder, all Generation I, they were presented at NAB and thus began marketing in the television market.

The output power of up to 1 Coder I Carry Watt, Watt 10 and both I and the Truck Coder Coder Heli I, still currently the largest market and is crucial to its high reliability and signal range.

The magic of COFDM digital technology in microwave propagation, combined with this level of output power of the transmitter BMS up to 1 watt, can achieve distances up to a mile in urban environments, without line of sight between the transmitter camera and receiver. The antennas used on both computers are omnidirectional 2 dBi gain, which additionally allows full mobility of both teams.

For longer distances required to have line of sight between the transmitter and receiver, but there is always the advantage that the reflections that may exist on the link will contribute to a better signal reception, eliminated the traditional problem of ghosting and lightheadedness.

In NAB 2004, BMS launched generation II of the Coder family, which maintains the same power levels and manages to optimize certain parameters of the MPEG2 video signal, such as the compression of both 4: 2: 0 and 4: 2: 2 and the low delay figure. The use of digital COFDM technology facilitates the mobility of a camera during the transmission of live video images, with the use of omnidirectional antennas at both ends in short-range links (20 miles).

Applications of wireless cameras with medium-range links (50 miles) require a transmitting antenna omni directional in the chamber and in the reception room of the image. BMS achieved through an automatic GPS tracking applications moving cameras receiving in ships, planes, helicopters to land and mobile units.

Meanwhile, the use of wireless in long-range links (100 miles) cameras, not only depend on the transmitter power, the direction of the antenna and tracking system but also the curvature of the Earth develops a decisive role in the reception, so they should be provisions such as placing as high as possible receiving antenna tower and preferably the tower on top of a mountain that allows line of sight at all times with the mobile camera that transmits the signal.

The BMS microwave systems are coupled and also transmit signals from cameras with Night Vision, thermoimages and infrared. Many of these applications are currently used by air forces and police in several Latin American countries.

See interviews in the clubhouse of a stadium, details of shots and angles of the plays live in a baseball game, football or basketball, you may be able to access sites where the news originates with a cameraman in an urban center or institution public as well as the use of a news helicopter on a highway or event site or applications for police and military use in the pursuit or monitoring of a region, are the most common applications of wireless cameras, where the signal received live is crucial to gain audience, information at the time and distance take immediate decisions.

Author: Latin Press

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