This is the coolest radio related thing I’ve seen on the web. It is a wideband web based software defined radio operated by the ETGD Amateur Radio Club at the Faculty for Electrical Engineering, Mathematics, and Computer Science at Twente University in Enschede, Netherlands.
It allows multiple users to listen to different frequencies simultaneously. Right now, as I am using it, there are 137 other users listening to different things.
It covers basically from 0 Khz to 30 Mhz, the lowest audio signal I was able to find was on 126 Khz in the long wave portion of the space, and right now the maximum usable frequency is around 15 Mhz, so beyond that can’t really receive anything at present. Right now I’m listening to a station playing opera type music at 153 Khz in the long wave band.
You can dial in the type of modulation, SSB (USB / LSB), CW, AM, and FM, the frequency, and the bandwidth. It is quite extraordinary.
The hardware is home brew and the circuit board work is incredible. The software allows each web user to individually tune and listen to different things at the same time.