Transistor oscillator tunable over wide frequency range - operates in VHF and UHF range and uses feedback impedance between transistor emitter and collector

摘要

The feed-back impedance is inserted between the emitter and the collector of a transistor forming part of an oscillator circuit. The feedback impedance consists of a series oscillating circuit with a capacitor (8) and a variable inductance (9) whose resonant frequency is above the highest reception frequency, or in superheterodyne receivers above the local oscillator highest frequency. This circuit one end is directly connected to a transistor electrode 10), and the other to a low voltage tapping of the oscillator circuit (3) inductance (4,5).