Transmitter (noun)

1. A device for transmitting information, such as radio waves, signals, or data.
2. A machine or device that sends out a signal, message, or broadcast.
3. An apparatus or machine that is used to transmit electrical or other types of energy, signals, or information.

Origin:

Late 19th century: from latin transmitere, from trans- "across" + mittere "send".

Examples:

1. He installed a transmitter in his car to track its location.
2. The transmitter was used to send the data back to the base.
3. The transmitter sent a radio signal to the receiver.
4. The transmitter was used to broadcast the live concert.
5. The transmitter was used to send signals to the satellites in orbit.