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We present the first installation and characterization of a phased array feed (PAF) on the 64 m Parkes radio telescope. The combined system operates best between 0.8 GHz and 1.74 GHz where the beamformed noise temperature is between 45 K and 60 K, the aperture efficiency ranges from 70% to 80%, and the effective field of view is 1.4 deg2 at 1310 MHz. After a 6-month trial observing program at Parkes,...
The Square Kilometre Array radio telescope (SKA) will be a next generation radio telescope, 100 to 1000 times more sensitive than any telescope currently available. The Australian Government has funded the CSIRO to develop and build the Australian Square Kilometre Array Pathfinder (ASKAP). This array of 36 antennas will have a total collecting area equivalent to 2% of the full SKA. We describe the...
The structure and performance of a high-power zener diode to be used for transient suppression or voltage regulation are described. A technique for accurately determining the energy absorption capability for pulse durations down to 10 ??s is also described and used in rating the device.
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