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.

Based on the results shown By WSPR , have you ever used the numbers shown to calculate and improve a transmitting Antenna? Do you know of any examples as I am looking for anything to learn from - cheers

QTH temporarily changed to Amrum, JO44dq.

Problem with 4 digit locator solved. Everything works as designed. A look into the WSPR User Guide 2.0 did help :-)

Since a couple of days I'm located at the island of Amrum and am testing my little beacon. The power is 0.05W. At the moment I'm having problems with the GPS module connected to the beacon as it only transmits 4 digits of the locator - but I know, it's possible to transmit 6 digits. Today (06/07) I transmitted the wrong power and again only JO44 as locator - even though I updated the code of the beacon.

Will continue testing...

Just found a Ultimate2 QRSS kit from qrp-labs in my drawer, power it up and it works!

Modified the Raspberry Case to allow plugging the module with extenders off the Pi.

. Running Raspberry Pi 3 with a TAPR Versatile WSPR module on 17M.
Antenna is my gutter and downspouts on my house facing east.

Hello everyone,
recently due to lockdown restrictions I started building stuff form ham shack.
Loving WSPR I decided to build a transmitter using a simple Raspberry Pi, just using
the maximum power of 10mW. And here.... are my results....

Glad I found my way to this website. Now I can assess my antenna and it’s performance. Also I can use this to adjust the direction of its broad side signals to suit me needs!!

To have an idea about the 160m propagation, I tested during one night this feature. Using an FT450 with 5 Watts into a vertical antenna 10m high with a loading coil at the base.
The 24 to 25 April 2021.

VK4BA Running A WSPR beacon ON 20 METRES up to AMATEUR Radio Day on 18 APRIL.

Trabzon Turkey

In my previous post I forgot to provide a link to the charts.
Visit the charts at

73 John