WSPR : Weak Signal Propagation Reporter Network

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.  Results are displayed on a map and tell you who is hearing you and who you have heard.  It's an excellent system for seeing how your set up works at QRP and for testing propagation

All you need to do is connect you rig to your computer, using something like the Digital Master Pro Plus interface and download the software from free from

I run my FT817 on either 2.5 or 5 watts using either a 1/2 sized G5RV in an inverted V (or a Delta Loop for 20m) with an ATU and have had some great success - especially into Europe, North America and Canada, the Indian Ocean and Australia areas.


0.5024 MHz, 1.8366 MHz, 3.5926 MHz, 7.0386 MHz, 10.1387 MHz, 14.0956 MHz, 18.1046 MHz, 21.0946 MHz, 24.9246 MHz, 28.1246 MHz, 50.293 MHz, 70.0286 MHz

2017 update : 
Now running with the new and popular WSPR Lite, available from Sotabeams.
Running just 200mv with a half wave dipole on 20m and 30m, the results have been very interesting.


The WSPRlite is a special test transmitter that sends a signal to a Worldwide network of receiving stations. When used with Sotabeams web-based DXplorer system (I use as I find this more useful), it's a powerful new way to evaluate antenna performance. Going way beyond antenna modelling or antenna analyzers, this unique system allows you to see how your antenna is performing in its actual location and in real-time! This type of analysis has never been possible before.

Specifications :

- 40 x 50 x 10 mm
- Beacon power: 200 mW (software configurable: 5 mW - 200 mW)
- VSWR: better than 3:1 recommended
- Frequency range 630-160-80-40-30-20m (external low-pass filter
  recommended below 10 MHz; 60m not currently supported)
- USB current: 150 mA maximum (5 Volts)
- Antenna connector: SMA socket