Circuit about 3.955-4.455MHz VF0

This circuit is an LC oscillating circuit for use in an 80 meter band receiver with an intermediate frequency of 455 kHz. LC oscillating circuit: LC oscillating circuit refers to an oscillating circuit composed of an inductor L and a capacitor C, which is used to generate a high-frequency sine wave signal. A common LC sine wave oscillating circuit has a transformer feedback LC oscillating circuit and an inductor. Three-point LC oscillator circuit and capacitor three-point LC oscillator circuit. The radiated power of the LC oscillating circuit is proportional to the fourth power of the oscillating frequency. To allow the LC oscillating circuit to radiate sufficiently strong electromagnetic waves outward, the oscillating frequency must be increased and the circuit must be open.
The characteristic is that the common-emitter transformer-coupled oscillator has high power gain and is easy to start, but since the common-emitter current amplification factor B decreases sharply with the increase of the operating frequency, the common oscillation amplitude is easily affected by the oscillation frequency, so it is commonly used. A fixed frequency oscillator.