Letter from Thomas Gold to Dr Richard Wielebinski, School of Electrical Engineering, The University of Sydney Telling Dr Wielebinski when he can see him. Also says that 'The frequencies and bands that you mentioned in your last paragraph would certainly be very satisfactory. We would even settle for narrower bandwidths if these very wide bands cannot be obtained. I doubt that the dish will be very good to 1700 Mc/s and therefore the 1400-MC feed really will not have to have a bandwidth that goes as far as this. I shall of course be very interested to have the results of the octagonal waveguide when you have tested it'. 21 February 1966