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The following project is about the design and implementation of a system for RF transmission for emergency vehicles such as ambulances, fire trucks, police cars and among others, which will have the single task of sending voice alert messages which will be received by radio receivers in Frequency Modulation (FM) laid in public and private vehicles determined by the scope of the system. The main component of the system is a programmable frequencies transmitter and a free hardware device called SDR which allows us to work in bands ranging from 88.0 MHz to 108 MHz corresponding to FM,. This system can be used as an alert equipment, in addition to the existing in emergency vehicles.

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