Oscillator circuit for HF tuner - has series connection of fixed and variable capacitor in parallel to variable oscillator capacity

摘要

The bit tuner oscillator has a variable frequency and HF input circuits, adjustable by variable capacitors. A variable oscillation circuit has a variable oscillation circuit capacity (6) and an inductance (7), both coupled to an input (4) and output (3) of the oscillator active portion (1), amplifying the oscillation circuit signals. A series connection of a variable (11) and a fixed coupling capacity (12) is in parallel to the oscillation circuit capacity. The series capacity junction point is coupled to the input of the active oscillator portion. Pref. capacity diodes form the variable capacities. ADVANTAGE - Improved coacting of input circuits and oscillator.