Definition
A paired set of avionics equipment in which the transmitter generates and sends radio signals from the aircraft, and the receiver detects and processes radio signals coming into the aircraft. Together they allow two-way radio communication and reception of navigation signals between the aircraft and ground stations or other aircraft.
Plain English
The equipment in the aircraft that sends out radio signals and listens for radio signals coming in. One half talks, the other half listens.
Context Anchor
Used in radar approach requirements, where the pilot must be able to receive controller instructions and respond by radio throughout the approach.
Derivation
Transmitter comes from the Latin transmittere, meaning to send across. Receiver comes from the Latin recipere, meaning to take or accept. So one piece of gear sends signals across the airspace, the other accepts what comes in.
Why Pilots Care
Enables clear communication with air traffic control and supports radar detection during instrument approaches in low visibility.
Analogy
It is like a two-way walkie-talkie: one side talks, the other listens, and then they switch. A radio that only listens would not be enough for this use.
Intuition Check
Do not read this as just any aircraft radio. In this context, the equipment must both receive instructions and transmit the pilot’s responses.
Example Sentence 1
Before departure, the pilot checked that the radio transmitter and receiver were both working by making a test call to ground control.
Example Sentence 2
Radar works by using a radio transmitter and receiver to send signals and detect returning echoes from the aircraft.