A superheterodino receiver. (Machine-translation by Google Translate, not legally binding)

摘要

A superheterodyne receiver that has automatic frequency control for receiving transmitter electrical signals, whose receiver includes a tunable local oscillator to generate a local oscillator oscillation, a mixing step for mixing the received signals with the local oscillator oscillation, an amplifier of intermediate frequency for amplifying the step output signal, said intermediate frequency amplifier being provided with one or more wave eliminating circuits for rejecting signals from a near frequency transmitter, a frequency discriminator tuned to the desired intermediate frequency, to which the signal from the intermediate frequency amplifier is applied to the discriminator and it supplies a control voltage in relation to a fixed reference voltage, whose control voltage is applied through a parallel capacitor that smoothes the control voltage, to the local oscillator, pair to the control of the oscillation frequency of the local oscillator, and means for switching the oscillation frequency of the local oscillator, for the transition from the reception of a transmitter signal to the reception of a different transmitter signal, characterized in that additional switching means are connected to said capacitor in parallel, which are coupled to said means for switching the oscillation frequency of the local oscillator, and which carry said control voltage for controlling the oscillation frequency of the oscillator. Local oscillator at the fixed reference voltage, during this switching operation. (Machine-translation by Google Translate, not legally binding)