The Propagation Whisperer

WSPR isn’t that new classic rock station in Springfield, it’s the automated Weak Signal Propagation Reporter protocol (pronounced “Whisper”) that helps map propagation paths throughout the world. Rather than rely on predictions and assumptions, actual propagation is measured, essentially in real time, and that data (including archives back to 2008) is available to anyone to use as they please. And have they ever.

Originally designed and implemented by that most digital of amateur radio patrons, Joe Taylor, K1JT, it is now maintained by a team at <wsprnet.org>. There, you can look at current and recent data to check activity on the bands, filter spots to focus on your bands of interest, download historical data, and participate in the WSPRnet forums (after registering). WSPR uses low-power transmissions, careful timing, and math tricks — like FT8 and other protocols — to receive useful signals from way under the noise, decoding signals as low as -28 dB in a 2500-Hz bandwidth.

To get started using the data, all you need is an internet