To key a microphone and broadcast a signal that collides with an ongoing transmission on the same channel. In FM systems, the stronger signal often suppresses the weaker one due to the capture effect, while in AM systems, the two signals mix into a heterodyne squeal. It usually happens when operators fail to listen before transmitting or suffer from hidden node problems.
Hold your traffic, unit four, you just stepped on dispatch. Say again, dispatch.
A common rookie mistake is keying the mic before pausing a full second to check if the channel is clear.
Also heard as
- walk on
Related terms
Double talk
A condition in a voice circuit where both parties speak simultaneously, often confusing echo cancellers.
Squelch
A circuit function that mutes the audio output of a receiver when no strong signal is present.
Hot microphone
A microphone that is actively transmitting or recording without the user actively pressing a button.