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.

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

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.