Description: ALERT radio is a one-way radio communication system where the station reports data in real-time. The radio is programmed to transmit sensor readings based on programmed sensor measurement thresholds. Data can be set to transmit upon intervals such as every mm of precipitation or rate of change such as water level rise over a period of time. Practically any condition the operator would like to trigger the message can be programmed. ALERT protocol is an open standard, meaning numerous vendors provide equipment and software. The radio signal for ALERT is in VHF range, normally from 140 to 170 MHz, meaning there is some flexibility in not being line of sight to receive the signal. ALERT is ideal in flat low-lying terrain where the use of repeaters may not be necessary. The primary use of ALERT is in flood warning and is typically bundled with decision support software to help in making decisive action. The ALERT radio frequencies are not typically shared with the public though in some countries approval from the communications regulatory agency may be required. There are no limitations on size of network but keep in mind all telemetry equipment and repeaters in the ALERT network are the responsibility of the user to maintain unlike Satellite and GSM where private companies and federal governments maintain the satellites and the mobile phone radio towers. Along with the ownership of the network also comes the security of private information unlike public networks
Costs USD Lower: $500
Costs USD Upper: $1,500
Accessories:
Advantages: The radio frequencies are not shared with the public, preventing incidental interference. Low latency. There are numerous suppliers of ALERT transmitters.
Disadvantages: One-way communication. User must maintain the ALERT network.
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