Quantitative determination of radio receiver performance

The practise of making quantitative measurements on the individual units of radio receivers is quite general, but seldom are such measurements made on receivers as a whole because of certain difficulties encountered in this type of measurement. This paper describes apparatus developed to overcome these difficulties and to make possible a study of the performance of receivers as such. The over-all characteristics of receivers are classified and described, the method of tests for obtaining measurements on them explained, with some curves shown to illustrate the results obtained from these tests.