This is 3 THz or 3000 GHz. Below that frequency we enter the domain of millimeter waves. That is, I mean any frequency below 3000 GHz. Since our eyes are not sensitive to radiation outside their limited range, we can not directly observe the sky using radio frequencies. This is not really very different than what goes on today among optical observers.
Many serious observers rely on CCD devices and computers to collect and process optical information.
When one thinks about radio astronomy one usually thinks about large, impressive radio telescopes and expensive, high speed computers. In general it does not sound like something an amateur could get into. I believe that is incorrect. The purpose of this page is to show how an interested amateur, using reasonably modest equipment, can do some exciting radio astronomy. As I write this, I don't know the details of how this will work either.