How does a car radio “hold onto” a weak signal for a long time, but if you change the channel and try to change it back, it can’t pick up on it again?

Question

This also works on an internet signal.

In: Technology

Answer 1

To add: There are also integrated circuits and filters designed to alter the frequency in fractional steps in effort to “follow” the signal, and filters that suppress frequencies outside of a predefined spectrum, such as static. These filters, nor the broadcast are absolute. Much like a crossover network, at the broadcast or passband frequency exists a slope. It’s not constant or cut and dry.