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Civil radio communication. Schemes, articles, descriptions

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Civil radio communications

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AC adapter for CB radio

Section Civil radio communications. CB radio stations that have appeared on our market are designed, as a rule, to be powered by 10 ... 12-volt batteries. The current consumed by such a station in the receive mode is 0,02 ... 0,3 A

Pulse generators and shapers

Section Beginner radio amateur. Based on the logic elements of digital devices, a variety of pulse generators can be designed. Here are some specific examples. The generator according to the circuit in Figure 1 (open-collector 2I-NOT elements are used) generates pulses in a wide frequency range - from units of hertz to several kilohertz. The dependence of the frequency f (kHz) on the capacitance of the capacitor C1 (pF) is expressed by the approximate formula f3

Notch filter

Section Nodes of amateur radio equipment. Filters and matching devices. The notch filter shown in Figure 1 is tunable with C1 from 28 MHz to 60 MHz and can be useful for TVI suppression. Coil L1 - frameless, contains 10 turns of wire 0,8 mm on a mandrel with a diameter of 8 mm, winding length - 18 mm. Branches - from 4,5 and 5,5 turns. L2 - also frameless, contains 6 turns of the same wire on a mandrel with a diameter of 12 mm, winding length - 18 mm. The design of the filter is shown in Fig. 2 ... >>

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Articles on civil radio communications



Radio stations, transceivers

Articles on radio stations, transceivers; schemes of radio stations, transceivers; descriptions of radio stations, transceivers: 197 articles



Articles on finalizing the RA3AO transceiver (V. Drozdov)

Articles on the RA3AO transceiver; RA3AO transceiver circuits; RA3AO transceiver descriptions: 22 articles




Articles on transmitters; transmitter circuits; descriptions of transmitters: 45 articles



Portable radios

Articles on portable radio stations; schemes of portable radio stations; descriptions of portable radios: 37 articles




Articles on transverters; transverter circuits; descriptions of transverters: 10 articles



Modernization of radio stations

Articles on the modernization of radio stations; schemes for the modernization of radio stations; descriptions for the modernization of radio stations: 29 articles



QRP technique

Articles on QRP technique; schemes of QRP technique; QRP technique descriptions: 5 articles




Articles on various civil radio communication devices; diagrams of various civil radio communication devices; descriptions of various civil radio communication devices: 12 articles



Latest news of science and technology, new electronics:

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Electron spin for quantum information transfer 18.05.2024

The transfer of quantum information remains one of the key tasks of modern science. Recent advances in the use of electron spin to expand the capabilities of information transfer in quantum systems have become very important. Researchers at Lawrence Berkeley National Laboratory are pushing the frontiers of quantum information science by experimenting with the possibilities of electron spin. Electron spin, a natural quantum bit, is a potentially powerful means for storing and transmitting information in quantum systems. Magnon wave packets, collective excitations of electron spin, have revealed their potential to transmit quantum information over significant distances. The work of Berkeley Lab researchers has revolutionized the way such excitations propagate in antiferromagnets, opening up new prospects for quantum technologies. Using pairs of laser pulses, scientists disrupted antiferromagnetic order in one place and simultaneously studied it in another, creating ... >>

Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

Random news from the Archive

Algorithm for Predicting Turbulent Flows in the Solar Atmosphere 08.03.2022

Scientists from the National Astronomical Observatory of Japan have developed a deep learning system for neural networks to detect hidden solar fluxes.

The knowledge of scientists about our luminary is very limited, which is explained by the complexity of its study. It is relatively easy to observe the temperature and motion of the solar plasma, which is periodically ejected perpendicular to the surface of the star. The gas that forms this plasma is so hot that only electrons and ions can be present in it. However, it is very difficult to determine the surface movements occurring on the Sun.

Japanese scientists have developed a deep learning neural network method to obtain hidden information about turbulent motion from observations of the Sun. Scientists were able to determine that information about the surface motion of solar matter can be extracted from data on temperature and vertical flow.

The neural network was trained on three different plasma turbulence simulations. As a result, she correctly predicted the horizontal motion of the plasma from data on temperature and vertical flows.

Scientists hope that the developed method will provide new data when studying plasma in the laboratory, which will allow scientists to move forward in the direction of fusion energy research. The specialists also hope to apply the new method for further observations of the Sun using the SUNRISE-3 balloon telescope.

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