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.

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

You can view the results of the Australian 50 & 144 MHz Leaderboard Challenge on the Australian Ham Radio Discussion Forums and also on the 144 MHz WSPR and the 50 MHz WSPR Facebook group pages.

50 MHz WSPR Leaderboard on AHRDF -

Hi Im new to this digital modes end of the hobby , been licenced for almost 5 years and enjoyed radio so thought it was time to try something new , hear me on give me a call 73

WSJT site almost finished me before I began ...with the bugs. Then I somehow found WSPR 2.0 and all was lovely. I like how WSPR can help us see who can actually hear our transmissions...on digital...and, of course, who we hear. How this will help us actually make contacts in the remote areas like Alaska and Australia I am not certain. But I am going to keep working on it. I think that this WSPR is more of a tool than a communication route. I still want to talk to Ian in Australia on SSB. A learning tool. 73 From Jim KW4PW