Improvements in intermediate frequency amplifier stages in mixed radio receptors with modulated amplitude and modulated frequency. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the amplifying stages of intermediate frequencies in the mixed radio receivers of modulated amplitude and modulated frequency, characterized by the use of the same transistors for the amplification of the intermediate frequency signals of one and another modulation system, reducing the number of those and of its accessory elements halved in relation to other intermediate frequency amplification systems, for which the constituent elements of the filters for one or another range of radiations are assembled in series, so that the radiations successively pass through the respective windings, and given the considerable difference of values of the intermediate frequencies in the case of frequency modulation and amplitude modulation, the reactances offered to the passage of the same by the windings are very different, each behaving with respect to the frequency of resonance of the other winding, as an element in short circuit, happening the corresponding inverse phenomenon with respect to the action of the capacitors of the circuits. (Machine-translation by Google Translate, not legally binding)