CoheraRX ONLY

A field guide to the radio waves

What is that sound?

The buzzes, warbles, chirps and beeps on your radio all have names. Hear real recordings, see what each one looks like, and learn how to tell them apart.

Open the field guide Play Name That Signal

Famous signals

The sounds people ask about most.

UVB-76, “The Buzzer”A buzz that almost never stops, since at least 1982. Numbers stationsVoices reading digits no one else can read. The Russian WoodpeckerAnd the radars you can still hear today. Pictures from spaceThe space station sends postcards you can receive.

Guides

Listen better.

How to identify a radio signal by earFive questions that narrow almost any sound to a handful.
Why is my radio buzzing?The noises in your radio, explained, and how to find the source.
Name That SignalA new five-sound challenge every day. Climb from S1 to S9+40.