X7301 Wireless Video Bridge AP128 - Warwick Wireless - #1

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A MULTI CAMERA VIDEO SYSTEM USING RADIO AP128 Overview In a conventional wired CCTV systems a number of cameras are connected to amultiplexer unit and then to a single monitor. The operator can then select the chosen picture. In many applications it can be difficult and expensive to lay coaxial cables. Espatially if there is a road, railway or river in the way. Cabling CCTV cameras in temporary or moving structures can also can be either difficult or impossible. In such application radio becomes very cost effective.There are five licence exempt RF channels allocated to the broadcasting of real timevideo signals in the UK. One is at 1.394GHz at 500mW and four at 2.4GHz - 2.8GHz at 10mW. Hence a total 5 cameras can be used to transmit real time colour pictures over the same site to five radio receivers.Conventional camera controllers send command data back to the camera over a RS485serial link. In a radio system a radio modem such as the X7200 operating on the 458.5MHz - 458.95MHz band can be used to replace the RS485 cabling. System Specification The system consists of four surveillance cameras at traffic junction, all are with 25meters of each . A further camera is sited 1.5 Km away from the junction so that the oncoming traffic flow can be observed. All 5 cameras broadcast their pictures back to a Police station which is 500 meters from the traffic junction.The four cameras at the junction are fitted with a TX7303 Video Transmitter with a unitygain antenna and one X7200 Radio Modem connected to the camera controller. All of Warwick Industrial Electronics Ltd Tel: +44 (0) 1455 233616 Fax: +44 (0) 1455 233179E-mail: sales@radiotelemetry.co.uk