Definition
A radio communication term used during military exercises to direct an immediate cessation of electronic jamming or interference activity. When transmitted, all participating units must stop the jamming operation at once, typically because of a real-world emergency, safety concern, or interference with non-exercise traffic.
Plain English
It is a code phrase that tells military aircraft and units to stop jamming radio or radar signals right now. It is used when something serious is happening and the practice interference needs to end immediately.
Context Anchor
Heard during radar services after ATC has used an aircraft’s identifying signal to confirm which radar target is yours.
Derivation
In military exercise slang, the jamming activity itself was nicknamed 'buzzer' because of the buzzing or static sound jamming creates on a radio. 'Stop buzzer' is therefore a plain-language instruction to stop that buzzing — that is, end the jamming.
Why Pilots Care
Restores usable two-way communication on a shared frequency so critical traffic and ATC instructions can be heard without delay.
Intuition Check
Do not read “buzzer” as a warning horn or cockpit alarm here. In this phrase, it means an electronic identification signal sent to ATC radar.
Example Sentence 1
When the controller reported that a civilian aircraft was experiencing GPS interference, the exercise lead transmitted 'stop buzzer' to halt the jamming immediately.
Example Sentence 2
Ground to vehicle seven, stop buzzer on this frequency.