Definition
An electron tube that generates high-power microwave radio energy by causing electrons to spiral through a strong magnetic field as they pass between a heated cathode and a surrounding anode containing resonant cavities. Magnetrons are the transmitting tube used in most aircraft and ground weather radar systems.
Plain English
A specialized vacuum tube that produces the powerful, high-frequency radio pulses a radar set sends out. It works by spinning electrons through a magnetic field to make microwave energy.
Context Anchor
Seen in aircraft weather radar, airborne radar maintenance, and radar transmitter discussions.
Derivation
From 'magnet' plus '-tron,' a suffix used in electronics for devices that control or use electrons (as in 'electron'). The name reflects that this is an electron tube whose operation depends on a magnet.
Why Pilots Care
It is the component that actually transmits the radar pulses, so a failed magnetron leaves the weather display blank and removes the pilot’s ability to see convective weather ahead.
Intuition Check
A magnetron is not a magneto. A magneto makes ignition electricity for an engine; a magnetron makes microwave radio energy for radar.
Example Sentence 1
When the weather radar stopped painting returns, the technician suspected a worn magnetron in the transmitter.
Example Sentence 2
Before departure the technician checked the magnetron output to confirm the weather radar was working.