The Design of an Intermediate-Frequency System for Frequency-Modulated Receivers

With a possibility that the present frequency-modulation wave band may be increased in width it has become imperative that an intermediate-frequency amplifier operating at a frequency higher than that most commonly in use at present, 4.3 megacycles, be developed. Stability both as to performance and permanence of adjustment govern the choice of frequency and restrict this choice to a definite maximum value. Design data are given in this paper for an amplifier operating on 8.25 megacycles which satisfies the stability conditions, and gives the required performance.