What are the sources of interference?

(1) Circuit thermal noise. Inspired by electronic thermal disturbances in the conductor.

(2) Internal noise of the electronic device. It is mainly caused by the non-continuous motion of the internal charge of the device, which is caused by the shotgun effect.

(3) Object radiated radiation noise (including what is commonly referred to as absorption noise). It is excited by the heat radiation of the object.

(4) Cosmic interference. A type of noise radiation from the universe.

(5) Sky interference. It is excited by the discharge of electric charge in the atmosphere and is pulsed.

(6) Industrial interference. Electrical radiation from electrical equipment; for example, electrical spark interference.

(7) Radio interference. Signal radiation from other stations.

(8) Various types of interference generated inside the receiver. There are AC beeps, combined tones, microphonic effects, linear products, noise caused by oscillator phase jitter, and various spurious interferences.