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Experiments – forgotten, but pretty
Radio receiver under the hood
ОглавлениеSo, we take a conventional radio receiver on batteries, set it to any wave and output the volume to the maximum. The receiver (see Fig.) Is located on a high dielectric stand, approximately in the center of the cavity of the structure, made up of several steel, cast-iron and aluminum pipes. The diameter of the inner tube is 30 cm, the height is 50 cm. From above and below all this is tightly closed now with steel plates of 50 mm, with the addition of aluminum and brass shields.
The structure is grounded.
As we conserve the receiver, the wave gets lost, and, instead of pleasant music, we hear only white noise.
According to all the provisions of physics, no external radio waves are able to break through to the oscillatory circuit of the receiver.
With the help of a simple device, a transformer and two discharge electrodes, we form an electric spark. The receiver will immediately respond with a characteristic creaking change in the tone of the noise.
What happened? After all (we will open the textbook of physics) even so-called. called the Faraday grid, incomparable with thick-walled metal screens, according to scientists, successfully absorbs the entire spectrum of radio waves.
Assumption 1. Electrons in a metal simply do not have time to synchronize their own reciprocating motion with incoming waves. But, only in this way they screen the radio wave.
Assumption 2. The receiver superheterodyne itself emits radio waves. Reflecting in a confined space, the waves constantly rebuild the oscillatory circuit. Thus, the receiver every minute runs through the entire range of settings, and is able to receive radio waves that have penetrated through the shielding screen.
Assumption 3. The electric spark and the oscillating circuit of the receiver, in this position, randomly emits radio waves, are similar to each other. Objects that have approximately the same spectrum of radiation – absorption communicate with each other in a special way, in addition to the laws of physics known to science. Changes in one object (A) are immediately responded to in another (B).
The receiver with autonomous power is in a steel earthed cylinder. The spark discharge penetrates the metal layers.