ES268741U - Preamplifier appliance and adapter of impedances for radio and television signals. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Preamplifier and impedance adapter for radio and television signals, essentially consisting of a high-frequency amplifier stage intended to be coupled to the antenna output and comprising a transistor with symmetric input by emitter and base whose emitter circuit, protected against atmospheric discharges by a bypass component, i receive the application, through a step capacitor, of the signals coming from one of the symmetrical inputs of the antenna, an input also applied to the secondary of a high frequency transformer whose windings are they are strongly electromagnetically coupled to each other, to define a negative feedback originating from a linear response in the frequency range to be adapted, also providing the adaptation of impedances between the collector of the transistor and the output of the stage, in so by means of a filter composed of an inductance in derivation yu capacity in series, to the base circuit of the transistor, also protected against atmospheric discharges, while the asymmetric output of the stage is connected to the collector circuit of the transistor through the primary of the transformer. (Machine-translation by Google Translate, not legally binding)