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Antenna tuner Noise bridge R15



Section Civil radio communications. When carrying out maintenance work on communication equipment, the noise bridge is used as a device for measuring and testing the parameters of various antennas, communication lines, determining the elements of resonant circuits and their characteristics, measuring antenna impedances, etc. ... >>

How to improve the selectivity of the receiver



Section Radio reception. The VHF FM receiver with PLL [1] developed at the time by A. Zakharov still attracts the attention of radio amateurs. As noted in later publications of the journal Radio [2, XNUMX], one of the significant drawbacks of this type of receivers is their low selectivity in the adjacent channel. The reason for this is the direct detection of powerful signals at the emitter junctions of transistors connected in parallel with alternating current. ... >>

Telephone answering machine



Section Telephony. Caller ID telephones have a mode in which the telephone operates as an answering machine. A standard phrase recorded in ROM is pronounced into the line. To record your telephone message, you need an additional sound card, which is not particularly common due to its relatively high cost. The proposed scheme operates independently of the telephone set and outputs a telephone message pre-recorded on a cassette recorder to the line. ... >>

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Articles on acoustic systems

Articles on acoustic systems; acoustic system diagrams; descriptions of acoustic systems: 180 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

Highway with luminous markings 16.04.2014

Design firm Studio Roosegaarde has piloted the smart roads of the future in the Netherlands to improve traffic safety and make it easier to drive in poor visibility and adverse weather conditions.

The idea is to replace standard road markings with intelligent ones. We are talking about the use of a special paint with photoluminescent particles. In the daytime, such markings will be able to accumulate energy, and in the dark - to emit light.

So far, "smart" markings have been applied to a 500-meter section of the N329 highway near the city of Ossa (the Dutch province of North Brabant). Eyewitnesses say that driving on such a road evokes the feeling of a fairy tale.

It should be noted that Studio Roosegaarde does not intend to limit itself to only glowing markings. The company's future plans include the creation of "smart" road warning signs that will appear strictly under certain conditions. For example, when the temperature drops to a certain point, snowflakes may appear on the roadway, informing about possible ice.

Studio Roosegaarde also proposes to install "smart" lighting systems on the slopes. Finally, in the future, special lanes for electric vehicles with integrated wireless battery charging modules may appear.

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