Definition
An electronic device that generates a radio-frequency signal, modulates it to carry voice or data, amplifies it, and feeds it to an antenna to be radiated as electromagnetic waves.
Plain English
The part of a radio that creates the signal you send out. It takes your voice (or other information), turns it into a radio wave, and pushes it to the antenna so the wave can travel to other receivers.
Context Anchor
Encountered when discussing aircraft radios, antennas, radio checks, and communication equipment problems.
Derivation
From Latin trans- (across) and mittere (to send). A transmitter literally 'sends across' -- in this case, sending information across space as radio waves.
Why Pilots Care
It enables reliable voice and data exchange essential for traffic separation, weather updates, and emergency coordination.
Intuition Check
A radio transmitter is not the whole radio by itself. It sends; a receiver receives. Many aircraft radios contain both, but the transmitter is specifically the sending part.
Example Sentence 1
After pressing the push-to-talk switch, the radio transmitter sent the pilot's clearance readback to the tower.
Example Sentence 2
During preflight the avionics technician verified that the radio transmitter was tuned to the correct frequency and producing a strong signal.