Hi Matthew,
The minimum elevation above the horizon of the dish is 30.5 degrees.
As the observatory it is at 33 deg S latitude, the furthest north in declination it can look is about +26.5 deg.
So in the end in can see whe whole sky
between -90 declination and +26 declination. Anything further north that about +26 degrees declination can't be examined.
http://www.parkes.atnf.csiro.au/obse...es-Observatory
Hope that helps,
Best,
Les D