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.

Site changes for new WSPR FST4W modes

Since around version 2.1.1 wsjt-x has been uploading a `mode` value that WSPRNet has not been consuming. With the advent of new FST4W quasi-beacon modes we will now consume that value.

Going forward we will process the `mode` according to 4 values:

  • "2"
  • "15" for the current WSPR modes -2 & -15
  • "5
  • "30" for the FST4W modes 300 & 1800

This change applies to the manual upload too, i.e. WSPRNet will support an 11th column `mode` which can be one of these above 4 values.

[From Admins] Map issue -- a fix of sorts

The issue with the Google Maps is related to the change Google made on July 16th, 2018 that severely curtails the free API limits. WSPRNet will be transitioning to an alternative mapping solution as soon as possible.

In the interim I have added a new field to the User Profile form for storing your own Google Maps API Key, if you want to get back to the way things were. You can get your own API Key by following the link below and I would strongly encourage you to read the Q&A down the page.

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