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Civil radio communication. Schemes, articles, descriptions
Free library / Schemes of radio-electronic and electrical devices
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Small-sized two-element Sigma-Yagi
HF Antenna Section. A small two piece Sigma-Yagi proposed by Peter Schmidt, DL9JFT, would require a few meters of steel pipe, perlon cable, antenna cable and four fiberglass sticks to make. As can be seen from Fig. 1 (dimensions are indicated for the 20-meter band, in square brackets - for the 10-meter band, and in round brackets - for the CB) the bearing traverse is made of Pg21 steel pipe with a diameter of 28 mm ... >>
The main directions of development of electronic ballasts
Section Ballasts for fluorescent lamps. Currently, the range of electronic ballasts includes dozens of standard sizes, differing in the number and power of the lamps used with them, the presence or absence of the ability to control the luminous flux, the nature of the inclusion of lamps (with or without preheating of the electrodes), the presence of a function to protect the device and the power supply from possible emergencies. With all the apparent diversity, the circuit solutions of modern electronic ballasts from the world's leading manufacturers are, in principle, the same (Fig. 3.12) ... >>
Reversible voltage converter
Section Voltage stabilizers. The proposed device is intended for emergency power supply of volatile electronic devices with low current consumption from a backup source in case of power failure (for example, a generator and an electronic clock pulse counter installed in a car). The converter (see Fig. 4.1) contains a backup battery GB1, a master generator on the elements DD1.1 ... DD1.3, a two-digit counter on D-flip-flops DD2.1, DD2.2, a double four-channel multiplexer DD3 and a capacitive storage divider - capacitors C2 ... C5 ... >>
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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
Transmitters
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
Transverters
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
Miscellanea
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:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
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The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
| Random news from the Archive Microchip LoRa RN2483 IoT Wireless Module
14.03.2015
Gartner predicts that by 2020 there will be 25 billion connected devices worldwide. The rapid growth of the Internet of Things challenges developers to create a simple and reliable infrastructure. Using ready-made modules simplifies this task.
Microchip Technology has unveiled a series of wireless communication modules that meet the specification developed by members of the industry organization LoRa Alliance. The alliance, which announced its creation in February, intends to promote a specification that describes low-speed long-range networks for the Internet of things.
A series of modules was opened by the RN2483 model, capable, according to the manufacturer, of providing communication at a distance of at least 16 km (in the suburbs) for at least 10 years without replacing the power source. The task of such modules is to connect network nodes corresponding to sensors with LoRa gateways. The module operates at frequencies of 433/868 MHz and can significantly speed up and simplify the development of IoT devices. Its dimensions are 17,8 x 26,3 x 3 mm. In addition to its small size, the module features 14 general purpose input/output (GPIO) lines, which provides flexibility in connecting and controlling various sensors and actuators.
The RN2483 firmware implements the LoRaWAN protocol stack so that the module is ready to be integrated into the infrastructure promoted by the members of the LoRa Alliance. The presence of a built-in stack allows you to connect the module to any microcontroller, as long as the latter has a UART interface, since the microcontroller is not required to allocate resources for the implementation of the stack. For example, any of the hundreds of Microchip PIC models is suitable for this role. In addition, the RN2483 supports the Microchip ASCII command and control interface.
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