A table of stations currently transmitting at certain frequencies, on top of a waterfall diagram where you can see a Morse code transmission scrolling away.

Notices where this attachment appears

1. Embed this notice
   blinry (blinry@chaos.social)'s status on Monday, 11-Mar-2024 05:22:39 JST blinry

   in reply to

   30: Assess the propagation of radio waves using beacons

   The International Beacon Project runs a network of 18 stations, which take turns transmitting their callsigns at certain frequencies.

   Using this system, you can quickly get a sense of how well radio waves are currently propagating to your location. Clever!

   I picked up the beacon from southern Finland! You can see its callsign scrolling away in the video. It's followed by four dashes send with decreasing power. I only heard the first one…