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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING Radio reception... no radio. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception The first case of this kind was told to me long ago by an old radio amateur. He had an original habit of checking the heating of the soldering iron by bringing it to his cheek. And then one day, when the soldering iron did not heat up well, he brought it to his cheek and ... heard a radio broadcast! The sound was quiet and was accompanied by a strong background of alternating current, but nevertheless the fact was beyond doubt - the soldering iron worked as a radio receiver. How to explain this case? The answer is pretty simple. The soldering iron did not heat up well for the reason that either there was a bad, oxidized contact in the plug connected to the mains socket, or simply in the twisting of the wire with the heating coil. And the oxide-conductor contact has the properties of a semiconductor diode, that is, it conducts current better in one direction and worse in the other. So, the detector is already there. The wires of the network, suitable for the house, served as an antenna and an oscillatory circuit, and the old sagging spiral, very loosely wound in a soldering iron, served as a telephone. All elements of the simplest detector receiver are present, so why not receive a signal from a local powerful radio station! Another case was told by the head of the radio center, Sergei Mikhailovich Zaitsev. In the early foggy morning, mushroom pickers from the city of Elektrostal near Moscow, near which there is a powerful radio transmitting center, were heading into the forest. A house was being erected on the outskirts of the city, and the hook of the crane, which had not been raised since the evening due to the negligence of the builders, swayed very low, literally a few centimeters above the concrete slab lying on the ground. In the morning silence it was clearly audible how the hook ... was talking! The sound intensified as the hook passed over an iron loop welded to the slab reinforcement, and faded as the hook was deflected to the side. You could listen to the morning news! It is quite clear that the tower, boom and cable of the crane formed a giant loop antenna, and a large field strength arose in the gap between the hook and the slab (at the break in the loop). It is possible that the "antenna" turned out to be tuned in resonance with the frequency of the radio station, then the field strength in the gap should have increased even more. The sound was probably generated by a quiet discharge from the hook to the stove, and the intensity of the discharge changed in time with the modulation of the signal. An even more impressive story was told by the builders of the road near the town of Taldom, where there is a powerful long-wave transmitting center (now Radio Russia broadcasts from there at a frequency of 261 kHz). When another dump truck lifted the body and the noise of spilled gravel subsided, the builders clearly heard that the body was... singing! I find it difficult to give any explanation for this case with certainty. It is possible that electrostatic forces of attraction acted between the individual parts of the body. And since the attractive force depends only on the amplitude, but not on the polarity of the applied voltage, the effect of a full-wave detection of a high-frequency signal occurred. Thus, the bodywork acted as a large electrostatic loudspeaker. Under normal conditions, the human senses do not respond to electromagnetic waves. But a few years ago, reports appeared in the foreign press about a man who constantly heard the transmissions of a local broadcasting station. Medical examinations did not reveal any features of his body, nevertheless, the fact was verified and confirmed - the person accurately reported the content of the programs. A possible explanation for this phenomenon is as follows: the conductivity of different tissues of living organisms is not the same, the nerve channels have the least resistance. Consequently, the current induced by the electromagnetic field of the radio station in the human body must flow mainly through the nerve channels. This is a high frequency current modulated by an audio signal. It is quite possible that some neuron or group of neurons in the auditory nerve possessed one-way conduction in this person, thus carrying out signal detection. It is also known that "signals" along the nerve fibers are transmitted by electrical impulses. The detected signal, acting on the auditory nerve, caused the sensation of sound. Author: V.Polyakov, Moscow
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