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.

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

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.