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Data transfer. Schemes, articles, descriptions

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Data transfer

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Types of modulation for long-distance communication on VHF



Section Civil radio communications. Long-distance radio communication on VHF is no longer a rarity. Now a fairly large number of radio amateurs regularly conduct communications using aurora, reflection from meteor trails, various kinds of repeaters, etc. Therefore, posing the question of choosing the most effective type of modulation for long-distance communication on VHF seems to be quite modern. The main factor determining the possibility of establishing a connection is the signal-to-noise ratio at the output of the receiver. Communication is possible only if this ratio is sufficient for intelligible reception of signals. From this point of view, the most advantageous is the auditory reception of telegraph signals, which is already possible at ratios of 0,5-1 (from -6 to 0 dB). In addition, it allows narrowing the receiver bandwidth to 0,5-1 kHz, which somewhat improves intelligibility. ... >>

Low voltage voltage converter, 5 volts 120 milliamps



Section Voltage converters, rectifiers, inverters. In devices based on digital microcircuits and microprocessors with autonomous power supply, batteries of galvanic cells must provide a stabilized voltage of 5 V. To achieve this in the simplest way - using six 1,5 V cells and an integrated regulator KR142EN5A - is unprofitable both energetically and economically. The proposed simple stabilized converter allows you to get a voltage of 5 V at a load current of up to 120 mA. Its input voltage can be in the range of 2 ... 3,5 V (two galvanic cells). The efficiency at an input voltage of 3 V and the maximum load current is approximately 75%. The converter circuit is shown in fig. 4.2 ... >>

Technical characteristics of domestically produced electrodes intended for welding carbon steels



Section Welding equipment. Data on electrodes are collected in several tables ... >>

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Articles on data transfer

Articles on data transmission; diagrams of data transmission devices; descriptions of data transmission devices: 22 articles

 


 

Latest news of science and technology, new electronics:

Using Apple Vision Pro during surgery 16.03.2024

The medical team at Cromwell Hospital in London used Apple Vision Pro for the first time during two spinal surgeries. This event confirms the headset's potential as a medical tool that will change the way surgical practice is performed. Although the doctors themselves did not use Vision Pro, the operating room nurse worked with virtual reality using glasses while preparing and performing procedures. The headset made it possible to view virtual screens in the operating room, select instruments and monitor the progress of the operation. Software developed by eXeX, a company that specializes in creating artificial intelligence-based applications for surgery, has significantly improved the patient care process. Using Apple Vision Pro opens up new opportunities for developing healthcare applications such as clinical education, surgical planning, training and medical imaging. Implementation of Apple Vision Pro in the medical industry ... >>

Carbon storage in the North Sea 16.03.2024

Norwegian Energy Minister Terje Åsland has announced the launch of the Longship project, which aims to create a central carbon dioxide storage facility in the North Sea. This ambitious project is valued at $2,6 billion and aims to apply CCS (carbon capture and storage) technology to mitigate the impact of climate change. Norway already has experience in CCS, thanks to the successful Sleipner and Snohvit projects, and is now looking to increase the amount of carbon sealed beneath the seabed. Longship's plan calls for capacity to capture and store 1,5 million tons of carbon annually over 25 years. Despite the positive outlook, there are concerns about the long-term consequences of such storage. However, proponents of the project argue that offshore carbon storage has a number of advantages, including minimal environmental impact. The Longship project is carried out with the participation of Equinor, Shell and TotalEnergies through the joint venture Northern Li ... >>

Mini-organs grown from human amniotic fluid 15.03.2024

An international team of scientists led by Professor Fan Xiulin from Zhejiang University has developed a unique method of growing mini-organs from cells found in human amniotic fluid. This significant medical breakthrough could lead to improved diagnosis and treatment of congenital diseases. The organoids, which are three-dimensional cellular structures that mimic organs on a smaller scale, were grown from lung, kidney and small intestine cells found in amniotic fluid. This method opens up new possibilities for studying various fetal conditions and may be the key to early diagnosis and treatment of birth defects. Although no treatment has yet been attempted, the scientists hope their research will help combat the serious congenital diseases that affect millions of newborns each year. This breakthrough could change medical interventions by making it possible to diagnose and treat congenital diseases. ... >>

Random news from the Archive

titanium paper 07.04.2002

Titanium dioxide, in addition to its whiteness, which makes it possible to make excellent white on its basis, has another important property: when irradiated with daylight, it reacts with air moisture, forming free radicals. These active compounds, strong oxidizing agents, are able to destroy microorganisms and decompose harmful substances.

In Japan, the production of paper has begun, in which titanium dioxide has been introduced. For example, wallpaper, paper screens and wall calendars are made from it. From an unventilated room with such wallpaper, formalin vapors completely disappeared in three days, which were launched into the air every day for the experiment. In a room without wallpaper, the concentration of formalin increased. Titanium wallpaper decomposes formalin to CO2 and water. On the surface of titanium paper, E. coli dies within a day.

The possibility of issuing titanium paper in Germany is now being considered.

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