The equivalent circuit and a local oscillator

The local oscillator at 1GHz or more to use more common collector circuit, it is not easy to produce low-frequency self-oscillation.
The equivalent circuit and a local oscillator - schematic

Typically the local oscillator signal to go through a buffer amplifier stage impulse applied to the mixer, mixing action to reduce the impact on the local oscillator frequency stability. Native oscillator and the like as shown in the equivalent circuit, are co-collector capacitance feedback oscillator circuit. When tuning voltage value changes, the capacitor connected to the oscillator circuit varactor amount of change, leading change the oscillation frequency, and thus can achieve channel selection.

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