Weather radios are designed to broadcast special frequencies and alert owners of hazards. The weather radio you buy can be set to silent until a warning of your choice occurs, at which point ...

The National Oceanic and Atmospheric Administration is responsible for broadcasting the signals used in weather radios ... broadcasts happen on one of seven frequencies between 162.400 MHz ...

For interstellar communication, a particular range of radio frequencies, “microwaves” from 1 GHz to 10 GHz, are particularly good choices. At lower frequencies our galaxy emits prodigious amounts of ...