Improvements in the automatic gain control devices in the tuner circuits of radio rechecters for modulated frequency. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the automatic gain control devices in tuner circuits of radio receivers for frequency modulation, characterized in that the range of variation of the tuning is extended, so that it is not necessary to place the tuning variable capacitor in the exact point corresponding to the transmitter that is captured, and the reception is considerably stabilized, independently of small variations of the frequency of the local oscillator of the receiver, for which purpose a semiconductor diode whose own capacity experiences variations according to the values is used in the circuit of said oscillator. of the voltage applied to it, which is provided by the ratio detector, so that if the voltage increases, the capacity of the diode decreases and the frequency of the oscillation increases proportionally, reversing the direction of the variations in question in the opposite case (Machine-translation by Google Translate, not legally binding)