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 http://wsprnet.org/drupal/

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.

Frequencies:

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.