These are all shown in this picture of the rotatable feed system . Amplifier chassis can be seen on the back side of the reflector. Full view of the 327 MHz kildal feed. Front-view of the aperture of the dual frequency feed. The inner concentric cylinders are the 610 MHz feed and the outer cylinder is for 233 MHz feed.
View shows the corrugated fins, with the front dielectric cover removed.
The white rectangular chassis below houses the front-end electronics of the 1420 MHz. Feed designed and constructed by Millimeter Wave Lab. of RRI, Bangalore.