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3-31 The COMMON-BASE DETECTOR is an amplifying detector that is used in portable receivers. The SLOPE DETECTOR is the simplest form of frequency detector. It is essentially a tank circuit tuned slightly away from the desired fm carrier. The FOSTER-SEELEY DISCRIMINATOR uses a double tuned rf transformer to convert frequency changes of the received fm signal into amplitude variations of the rf wave. The RATIO DETECTOR uses a double-tuned transformer connected so that the instantaneous frequency variations of the fm input signal are converted into instantaneous amplitude variations.


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