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Noise limited Receiver Sensitivity Measurement Technique........... 1 More About Transistor Measurements with the

By John P. Vanduyne, Engineering Manager and Hf-vhf Bridge


As the communication industry pushed above 30 mc, especially as stimulated by the pressures of World War 11, it was found that the external noise sources had dropped to negligible proportions, compared to internal receiver noise, above 100 mc. The need for greater and greater radar sensitivity, VHF communication range, and less “snowy ” TV pictures rapidly pushed internal receiver noise down to the level where cosmic radio background radiation (popularly called cosmic “noise”, due to its randomly fluctuating character) limits useful receiver sensitivity from 30 to 100 mc, or dow

Year: 2013
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