One would expect there to be a newsgroup and associated FAQ, such as sci.astronomy.radio - amazingly there isn't one! In fact, there is precious little information on the internet with regards to radio astronomy. This is unusual when you consider that Earth is quite literally a radio telescope pincushion!
Rather than reinvent the wheel and start writing a FAQ from scratch, we have decided to provide a link to the most excellent FAQ produced by the NRAO. This is probably the single most informative document on the internet for the budding radio astronomer or laymen.