Wsprry Pi

Wsprry Pi is a Raspberry Pi-based transmitter for amateur radio operators who want to explore propagation with WSPR. The project focuses on making a low-cost, low-complexity beacon practical to install, configure, and operate on common Raspberry Pi hardware.

As of version 3.0.0, several CW capabilities were added to the suite:

  • QRSS: The name “QRSS” is a derivation of the Q code “QRS”, a phrase Morse code operators send to indicate the transmitter needs to slow down. The extra “S” means slow way, way down.

  • FSKCW: Frequency Shift Keying CW is a variant of QRSS. Instead of switching the carrier on and off, FSKCW keeps it active for the transmission and shifts the frequency downward during gaps between elements and characters.

  • DFCW: Dual Frequency CW is a combination of QRSS and FSKCW. In DFCW, the element duration is replaced by the element frequency, speeding transmissions considerably.

To configure these modes, see Configure WSPR and CW. For their direct command-line controls, see CW Mode Options. Scott Harden’s AJ4VD website provides additional QRSS background and experiments.

This documentation is organized to help you move through the project in a practical order:

  • Learn what WSPR is and how Wsprry Pi works.

  • Install the software and required supporting services.

  • Configure and operate the system through the web UI or command line.

  • Use the reference and FAQ material when you need detail or troubleshooting.

Start Here

Operate Wsprry Pi

Reference