The ultimate QRSS Transmitter Kit is produced by Steve G0XAR and Hans G0UPL in 30, 40 and 80m versions.

The kit contains the PCB, LCD, programmed microcontroller and all board-mounted components. Download the instruction manual using the link above. The PCB is quite compact and moderate care is required in the construction. A rich array of functionality is provided by the design; please read the instruction manual to understand the facilities provided. Builder modifications will be shown on this page as they are developed!

Photo by hanssummers.com

Note for WSPR users: the 30m kit has a 10.140MHz crystal which is suitable for either the QRSS sub-band or the WSPR frequency. Therefore on 30m the kit can be used as a standalone WSPR transmitter. On other bands you may need to supply a suitable crystal for the WSPR frequency on that band. Alternatively you could use this kit in the AF output mode, fed into a conventional SSB transmitter set to the frequency of your choice.

The kit supports the following modes:

  • QRSS mode (plain on/off keyed slow CW)
  • FSK/CW mode (frequency shift keyed slow CW)
  • DFCW mode (dual frequency CW)
  • WSPR mode (Weak Signal Propagation Reporter)
  • Slow-Hellschreiber (frequency shifted slow-Hell)
  • Full-speed Hellshreiber
  • Half-speed (“DX”) Hellshreiber
  • CW (plain CW)
  • Customisable FSK patterns

Other features:

  • 24-character LCD + two-button user interface
  • User-programmable (callsign, message, speed, FSK, mode, etc.), settings stored in EEPROM
  • GPS interface, for locking the frequency in slow-speed modes
  • On-chip generation of WSPR encoded message (no PC required)
  • WSPR maidenhead locator can be generated from GPS-derived latitude/longitude
  • Selectable “frame” size, for stacked QRSS reception
  • Plain CW callsign identifier at selectable interval
  • Produces 150mW RF output, or AF output for driving an SSB transceiver
  • Higher output power by additional PA transistor and/or higher PA supply voltage

The estimate price: 19 EUR or 24 USD.

Link