Research and education · non-commercial
An open laboratory
for radio listening
Radio signals are all around you right now: amateur radio operators on the other side of the world, shortwave broadcasters, satellites, and the Sun changing the ionosphere. You do not need to buy anything to listen. Here you can try a radio workbench in your browser, tune into real receivers shared online, and learn about what you hear.
Open the radio workbench Listen to a real receiver
The background is an illustrative waterfall display, not a live signal.
conditions now
radio workbench · simulator
Sit in front of the radio
Turn the dial, change band and mode, watch the waterfall display react to current propagation. When you find something interesting, a tap takes you to a real receiver already tuned to the same frequency.
Start operatingThe laboratory
Receivers
Open radios in Brazil to listen via browser, with map, filters, and history.
Propagation
Sun, K-index, X-rays, gray line, solar cycle, and the WSPR network in Sao Paulo.
Satellites
When the ISS and amateur radio satellites pass over your city.
Tools
Grid locator, antennas, converters, Morse and the band plan.
Learn
14 short guides, from the first signal to becoming a radio amateur.
Open data
The same numbers in JSON, for classes, research, and projects.
Start here
What is radio listening
Listen to radio out of interest in the signal itself: who is transmitting, from where, and how it arrived. You can start today, in your browser, without buying anything.
Spectrum map: who lives in each band
From long waves to 1090 MHz: what to hear in each slice of the spectrum and at what times it is worth looking.
How to use a WebSDR
A step-by-step guide to KiwiSDR, OpenWebRX and classic WebSDR: tuning, modes, filters, zoom and the etiquette of using someone else's radio.
How the laboratory works
Open sources only
Everything here comes from those who already publish openly: receiver directories, NOAA, N0NBH, CelesTrak and the WSPR network. Each piece of data states where it came from.
Receiver belongs to the owner
Receivers are included as links. Nothing is recorded or retransmitted: you listen on the maintainer's page, following their rules.
No tracking
No ads, no cookies, nothing for sale. Whatever you save (listening notebook, favorites) stays only in your browser.