The Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions. The software is open source, and the data collected are available to the public through this site.

Episode 2 brings new charts with a focus on regular winners of the "WSPR challenge" conducted by Remko PA3FYM and Rob PE1ITR at

View the charts to see the bands, times and SNR of every spot reported by winners of the RX section - as measured by total Km for all bands.

Entrants in the TX section can view their callsign in the charts for each band and SNR reported by the RX winners over a 24 hour period.
The charts reveal strategies used by reporters with the biggest ears on the planet.

Enjoy the WSPR challenge.
73 John VK4CT

I am new at WSPPRnet and i like to meet you in this net. Ilive in Apeldoorn in the middle of the Netherlands and I use Airsy HF+ Discovery and Icom IC-705

A new version of the RFzero library: has been released. It includes the new FST4W narrow digital mode with its four sub-modes. This enables the RFzero GPS controlled RF source to send FST4W, in addition to WSPR, as a stand alone transmitter.

Hi everyone. I've recently obtained my licence and have been associated with radio (11m ssb) since 1978 and enjoy making and experimenting with wire and antennas. I'm just getting started on Digital modes and like the idea of working QRP in voice and digital modes. 73's...Dave

When sending type 3 messages, i.e. a message with a six character locator e.g. JO65FR, in WSPR the call sign is hashed. This means that instead of sending the call sign a 15 bits hash code is sent. But the hash code is not unique to the specific call sign but "shared" with some other call signs. In such cases hash collision can happen if both transmitting stations are decoded by other stations irrespective of only one of the transmitting stations is sending type 3 messages.


I have finished the radio to 40m tried whisper Wow for $49 Just Wow

Just finished converting the Sirio New Tornado CB antenna to 20 and testing it with WSPR. Seems to work great. I'm hoping to catch some AustralAsia in the morning. Fingers crossed! More info on my blog. It's a simple modification and the antenna can be bought for under $100.

Home designed WSPR interface - based on the PAØMBJ design.

The band-opening charts reached a new milestone today.
The propagation charts now embrace 54 segments - six continents by nine HF bands.
Each segment aggregates WSPR spots into a period of seven days.
I'm looking for feedback to guide further development. Email is on the charts.
Visit the charts at

Well the pandemic has changed the world...for worse of course. But some have a lot of time to try new, affordable things. Time to take a new interest in WSPR. Lets go!

I've made a repository called wspr-cui on GitHub including:

  • wsprd code extracted and reformatted from WSJT-X 2.3.0-rc2
  • CUI event loop code for TX/RX with FT-891 and SCU-17
  • And other miscellaneous information

See for the further details.

Kenji Rikitake, JJ1BDX

John uses WSPR data to chart DX HF band openings to Australia.

View the charts at

Comments are welcome. John's contact details are on the charts.

Chances are your call sign is already in the charts :-)

73 John, VK4CT