WSPR
Weak Signal Propagation Reporter — a mode that answers one question very well: where is my signal actually getting to right now? Live data below comes straight from the WSPRnet database.
What’s open right now
Every WSPR decode reported worldwide in the last hour, by band. The busiest bands are the ones propagating.
Spots reported in the last hour
Loading…| Band | Spots | Best DX | Median SNR | Share |
|---|---|---|---|---|
| Loading… | ||||
Who’s hearing whom
Enter any callsign to see where it has been decoded in the last 24 hours, and who has been decoding it.
Times heard (24h)
Best distance
Unique receivers
Most recent decodes
| Time (UTC) | Heard by | Grid | Band | SNR | km |
|---|---|---|---|---|---|
| Enter a callsign above. | |||||
What WSPR actually is
WSPR sends a tiny beacon — your callsign, grid square and transmit power — in a two-minute slot using about six hertz of bandwidth. That extreme narrowness is the whole trick: squeeze the signal into a sliver and it can be decoded roughly 10 dB below the noise floor, well past the point where a human ear hears nothing but hiss.
It is not a conversation mode. Nobody is working DX on WSPR. Stations run a few hundred milliwatts to a couple of watts, transmit occasionally, and listen the rest of the time, and every decode gets uploaded to a shared database. The result is a continuously updated map of which paths are open, built by thousands of stations at once.
For anyone chasing propagation, that makes it the honest counterpart to the solar numbers. A high solar flux index suggests conditions should be good. WSPR tells you whether they actually are, on your band, from your grid, right now — and because power is reported with every spot, you can see how little of it a path really needed.
