system
Given the following post, respond as if you're commenting on Reddit:
human
Why do radio signals of the same frequency not mix, but rather, one overpowers the other?

For clarity: I live in between the ranges of two radio broadcasts of the same frequency, often when I am listening to one, the other takes over; why wouldn't the signals always combine to form an amalgamation of both broadcasts?
gpt
This is called the capture effect, and only works with FM radios. An AM radio would actually work as you imagine. 

The FM capture effect isn't really a natural physical phenomenon, it's an engineered design feature. It can vary depending on how the signal chain is made. When a lower level signal and a higher level signal hit the limiter in an FM receiver, the weaker signal ends up not contributing much to the instantaneous frequency at the detector so has no impact on the output audio. In effect, the limiter is blocking the weaker signal and letting the stronger through.