Two radio microphones per 1 km. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two radio microphones per 1 km. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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The circuit shown in the figure works at a distance of up to 5 km. To turn it into a 1 km circuit, you should exclude the final stage on the KT610 and connect the antenna to the midpoint of the L3 coil.

Two radio microphones per 1 km

The scheme works well only after the selection of all the parts marked with an asterisk. It is desirable to shield the master oscillator with the preamplifier from the output stage.

If the frequency floats strongly, then transplant the collector of the transistor of the master oscillator to the middle of L1, as is done with L3. In this case, the trimmer capacitor must still be connected between the collector and emitter.

All tuning capacitors - 5 ... 25 pF.

All coils have a diameter of 5mm and are wound with PEL-0,5 wire.

L1 - 5 turns.

L2 - 2 turns.

L3, L6 - 3 + 3 turns.

L4 - 2...3 turns.

L5 - 25 turns.

L7, L8 - 2 turns.

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Changing the shape of the auricle can deprive a person of the ability to determine where the sound source is. Canadian scientists came to this conclusion by temporarily changing the shape of the ears of several people.

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16 volunteers took part in the experiment. Each of them sat in a chair in a specially equipped room, where speakers were placed at different heights to the left and right of the chair. Participants in the experiment had to determine where the sound was coming from. They did it well, but only until the scientists fixed silicone pads on their ears that changed the shape of the auricle. After that, the volunteers began to say that the sound came from above, while the bottom speaker actually worked, and vice versa. True, after a while, the pads stopped interfering with sound localization: the brain adapted to the new shape of the ear. The shape of the auricle of each person is individual; There are no two identical ears, just as there are no identical fingerprints, so the specific criteria by which the brain determines the height of a sound source are also strictly individual, the authors of the work conclude.

During the experiment, the scientists recorded the activity of neurons in the auditory cortex using MRI. Scanning showed that the higher the sound source, the weaker the response of neurons; it is possible that the brain determines the height of the sound source by the level of cell activity, Trapo and Schoenwiesner believe.

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