Hi Matthew,
Welcome to IIS. It doesn't seem many people are payng attention to your question but I think the problem is that you might need to re-word or re-phrase it after a little thought on you part.
Are you asking about its
resolving power ie ability to "see" as seperate, increasingly close radio sources?
Are you talking about how faint the signal is before it is no longer detectable?
Are you asking about its limitations as to what part of the sky is visible?
Are you asking about what wavelengths are outside its ability to "hear".
What do you mean by "information"?
These are all seperate questions and I think you need to ask something more specific. Most of us here are amateur astronomers and (very) few of us are involved in radio astronomy.
Does this help:
http://en.wikipedia.org/wiki/Parkes_radio_telescope
Or this:
http://www.parkes.atnf.csiro.au/
Perhaps you might get a quicker answer from the ATNF of Parkes themselves because as I said, few (very few) of us are involved in radio astronomy and a very small number are professional radio astronomers.
Best,
Les D