http://physics.princeton.edu/pulsar/K1JT/wspr.html
http://wsprnet.org
You don't even need to be able to transmit in order to contribute -- if you have a shortwave receiver, you can feed the audio to the software and let it publish what it finds. I'm amazed at how far away I've received stations. I'm routinely getting England and Germany on 20 meters -- which wouldn't be surprising for normal communications, but not at very low power! Earlier this afternoon, I even had a signal from New Zealand -- over a path which, obviously, didn't even include any darkness, unless it was going the long way around!
http://wsprnet.org
You don't even need to be able to transmit in order to contribute -- if you have a shortwave receiver, you can feed the audio to the software and let it publish what it finds. I'm amazed at how far away I've received stations. I'm routinely getting England and Germany on 20 meters -- which wouldn't be surprising for normal communications, but not at very low power! Earlier this afternoon, I even had a signal from New Zealand -- over a path which, obviously, didn't even include any darkness, unless it was going the long way around!
