magnet.ca> writes: > > Can anyone guide me towards a relatively budgetary solution (ideally > PC based) for logging a broad spectrum or multiple narrower spectrums > of Extra Low Frequency electro-magnetic radiation in the .01-2000 Hz > range? Something like a simple card for PC with external antenna of > some sort would be great. I think SETI people use this tipe of equipment. I remember seeing couple amateur groups with home-brew radiotelescopes some-time ago. They record signal in this range after downconversion. Another option is to use PC sound card. All you need is sample at >4Khz in order to do spectrum analysis. Sergey -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist