You may even be able to pick up voice transmissions from air traffic control towers if you are close enough to an airport. You may be able to listen in on civil or private aircraft, commercial airliners, helicopters, and more depending on your proximity to a large airport. There is a tremendous amount of variety of what can be heard when tuning your software defined radio into ATC signals. With an AM signal, the stronger of the two will be heard, as opposed to FM where two signals usually cause static due to the interference. AM is used for ATC signals in order to avoid interference from multiple transmitters using the same band. Since ATC signals us AM, these signals can be picked up from 10s or even over a hundred miles away. Listening to ATC chatter on your SDR can be quite excitingĪir Traffic Control or ATC signals can be an interesting place to start with your new SDR.
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