Radina B/B2/RG2001B/Mini
This system is developed for smaller towns and settlements. It works on 3 frequencies, as when one main and two doubling frequencies are used, the maximum number of guarded sites is 8192, and when two main and one doubling are used, this number is 16384. The main station (RADINA B) has two built-in modems for communication with two repeaters and a built-in coder-decoder for the receivers in the coordination room – up to 3. Also it has two serial ports for connections with radio modems. In this way the device is more compact and less expensive. There is a serial port for connection with a main station. The visualization of the received information and the programming of the operating modes are in the same way as in the case of RG2001 B2. The coder-decoder (RADINA H), build-in in the repeaters, provides a possibility for 3 radio stations with build-in modem for wire connection and serial for radio modem. The maximum configuration of the system is one main station and two repeaters working on 3 frequencies, or altogether 9 receivers listening to the ether in 3 points of the field.
Base station RadinaMini is purposed to build a small and light security systems up to 2000 sites, with or without up to two repeaters Radina H.
The system consists of a main station and repeaters, which are composed of a coder-decoder of radio messages and the respective number of radio stations. The main station (RG2001) is located in the coordination centre and it has 8 channels for communication with maximum 8 repeaters and 4 channels for communication with up to 4 work stations for monitoring of the sites. When 4 main radio frequencies and 4 random for doubling of alarm messages are used, the maximum number of guarded sites is 32768. Communication between the main station and the repeaters is through external modems for wire connection and/or radio modems. A graphic display 240x128 px or 16 rows with 30 symbols each is used for visualization of received information . Menus of the graphic display and the placed next to it input device are used for programming of the main station modes. Menus could be scanned by rotation of the input device and chosen by pressing it. The main station could be connected to a printer and the whole acquired information could be printed. If the number of sites is greater, information received from them could be selected based on some characteristics and it could be distributed to up to 4 work stations for visualization, processing and recording. The main part of the repeaters is the coder-decoder (RG2001 H). Up to 8 radio stations could be connected to the coder-decoder. There is also a serial port for connection with a modem (radio modem). At the maximum configuration of the system – 8 repeaters working on 8 frequencies, 64 radio receivers listen to the ether distributed in groups of 8 for a frequency at different points – 8 in the field. This is a guarantee that no message, sent from any guarded site, will be missed. Because of the fact that the alarm messages are doubled over one of the four frequencies (or more – up to 8) by a random law, it is practically impossible the channel to be blocked, since the frequency over which the doubled message will be transmitted is not known in advance. When a repetition of 4 or more times is set, the alarm message is transmitted over 5 frequencies and the order is determined randomly.
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