The National Oceanic and Atmospheric Administration (NOAA) manages a few satellites in low earth orbit. There are three actively transmitting APT signals at the moment, NOAA15, 17, and 18. Each of these satellites passes overhead a few times a day. I’ve been interested in learning how to receive their signals for a while now, and I’ve finally succeeded!
via alternet.us.com
Really cool, the guy implemented a software radio in order to receive satellite images. The software radio kit he used is pretty cheap (~US$ 20), which makes me want to do the same at home. :)