Abstract
A description is given of an Adler tube operating at 2700 Mc/s. This is a sealed-off version of a previously described demountable experiment at 4000 Mc/s. Gain of 24 dB can be obtained and the double channel effective input noise temperature is 96°K (noise factor 1·24 dB), as measured at the input terminal of the tube. By correcting for circuit losses the effective beam temperature is given as 62°K. A band-width of 10 Mc/s is obtained at points where the minimum noise temperature is doubled. Improvements which may reduce the noise temperature even further are described.
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