Introduction to WSPR

WSPR = (pronounced “whisper”) stands for “Weak Signal Propagation Reporter.”

What is it?
A computer generated low power Interactive Beacon mode which is surprisingly easy to set up and extremely addictive!

WSPR Sends and receives low-power data transmissions consisting of Callsign + 4 digit locator + dBm transmit power, a total of 50 Bits.

The program can decode signals with S/N as low as −34 dB in a 2500 Hz bandwidth.

Frequencies used are from LF, MF, HF, VHF, UHF.

The software can provide data to a website where your results and the results of others are displayed in real time and over time .

What can I do with it?

  • Live propagation data between you and other WSPR stations
  • Watch the behaviour of prorogation over time, the seasons and the sunspot cycle.
  • See the bands open!
  • Check out the practical performance of your antennas.
  • Have fun seeing what countries and prefixes WSPR can work on low power.
  • Can participate as a “receive only” station.

What do I need?

  • SSB receiver or transceiver and antenna
  • Computer running the Windows, Linux, FreeBSD, or OS X operating system.
  • 1.5 GHz or faster CPU and at least 100 MB of available RAM
  • Monitor with at least 800 x 600 resolution
  • Sound card supported by your operating system and capable of 48 kHz sample rate.
  • WSPR software
  • If you will transmit as well as receive, an interface using a serial port to key your PTT line or a serial cable for CAT control. Alternatively, you can use VOX control.
  • Audio connection(s) between receiver/transceiver and sound card
  • A means for synchronizing your computer clock to UTC (e.g. Dimension 4)
  • WSPR Software

Where do I find more information? WSPR Net – lots of info along with interactive maps and charts   Alternative WSPR interactive maps and charts only  Joe Taylor K1JT and software link.