Radio Astronomy Power Point Presentation:
This powerpoint defines radio astronomy, shows radio images of objects compared with optical images, talks about interference and the GBT.
Notes that accompany this power point give additional resources, and list sources of most files culled from the web.
I hope you find it useful! If you want to listen to the pulsars, you will have to also download the .au files.
Powerpoint Presentation : "Radio Astronomy: the Story of Science, Technology and the Noisy World we Live in"