Receiver, cryogenic, 6-cm wavelength, metal, used on Parkes Radio Telescope, CSIRO Radiophysics/Airborne Instruments Laboratory, Australia, 1970-71.
(-1)Cylindrical feed horn
(-3)Silver metal cap for test gauge
Liquid helium is used to cool the receiver to 15 K. It is contained in a metal box with refrigeration equipment.
(-2/1)Manufacturers details stamped onto plate, attached to refrigeration unit, 'CRYOGENIC COOLER / DRIVE UNIT, ASSEMBLY / DESIGN ACTIVITY CODE - P/N / 31949 - [illegible] REV. 5 / SERIAL NO. 712 / MFG DATE SEPTEMBER 1972 / CRYOGENIC TECHNOLOGY inc. / WALTHAM, MASS., U.S.A'.
(-2/7:8)Manufacturer's mark moulded into centre of caps, 'hp'