sorry if i didn't specified myself
my project consist in simulating a lighting intersection(the red, and green, traffic lights) which involve using emergency vehicle or simulated on a small prototype, approaching an intersection. the idea is that when ever and emergency vehicle approach the intersection it would transmit a signal using a RF transmitter, to to and RF receiver on the intersection, once is detected the algorithm would change the all traffic lights to red in order for the traffic to stop and the emergency vehicle to proceed freely.
it's possible for the transmitter be independent just using a power supply?
A signal contains information. A carrier is just a RF field with NO information. Where would the information come from to modulate your transmitter?
Have you researched the current legal way emergency vehicles signal traffic lights?