When I was teen, in the middle of 80', I got excited about electronics and I began to assemble audio devices (amplifiers, mixers, guitar effects, synthesizers…) achieving quite satisfactory results. During my life I have been forced to drop out of it, but now I would like to get back to the old fascination. But I feel that the the audio field is by now a bit obsolete and I'm looking for a new land. My dream is the radioastronomy ( Sun, Jupiter, Milky Way, … ) but it's too hard and expensive. Can you, please, give some hints about an inspiring and innovative sector ? Thanks !!