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 01.
In the foreground is a L band and S band receiver, the one
behind is a C band and X band receiver. They were built at
the Radiophysics facilities near Epping in Sydney.
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 02.
This device is a feed horn, machined to be used at the focus
of the antenna. It is for the C band and X band
receiver.
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 03.
The stainless steel dewar has the air evacuated from within
it to insulate the cryogenically cooled electronics from the
outside world. Helium is used as the refrigerant.
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 04.
Here you can see the electronics which are located inside
the cryogenically cooled dewar in each antenna. This
equipment operates at -263°C (10 degrees above absolute
zero): the cooling cuts down the "noise" generated by the
receiver, allowing very weak astronomical signals to be
detected.
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