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Frequency synthesizers. Schemes, articles, descriptions

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Frequency synthesizers

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Portable radio station at 430-440 MHz

Section Civil radio communications. The article describes a simple and affordable radio station operating in the 430-440 MHz band. Despite its simplicity, it showed good results at Field Day 1962 with a communication range of 40-60 km. After the Field Day, during a special check, the signals of the transmitter installed on the plain were detected by a communication receiver placed in a car at a distance of up to 200 km. To minimize high frequency losses, the generator is mounted together with a transmitting antenna on a mast (Fig. 1). The transmitter modulator and receiver are located below, on the operator's table. The receiving antenna is 2,1 m below the transmitter antenna. The total height of the mast is about 10 m ... >>

How to read the schematic of your receiver

Section Beginner radio amateur. To correctly connect the parts of the receiver, you used the drawings. On them you saw a coil, telephones, a detector and other details and connections as they look in nature. This is very convenient to start with, while you have to deal with very simple radio designs, which include few details. But if you try to depict the structure of a modern receiver in this way, you would get such a web of wires that it would be impossible to understand. To avoid this, any electrical appliance or radio device is depicted schematically, that is, using a simplified drawing - a diagram. This is not only done in electrical and radio engineering. ... >>

Beginner radio mechanic

Section Ham Radio Technologies. You decided to repair the equipment and earn a piece of bread for yourself. Think well - repair is a difficult and thankless task. You will earn money for bread, and maybe even with butter over time, but definitely not for caviar. This is not the business. Well, we'll fix it well. The first thing you can't do without is a soldering iron. We choose a 25-watt soldering iron - we will repair electronics. Although in the future, you may also need 40,75 and 100 watts - you will get it as the need arises. Each soldering iron has its own task - and from this we proceed. Yes, soldering irons with a step-down transformer are very good - that's what I recommend. It is advisable to pick up with a replaceable sting - in my practice, you grind off the sting faster, forming a flat area than the winding burns out. Next, you need a tester. Any chain will do ... >>

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Articles on frequency synthesizers

Articles on frequency synthesizers; frequency synthesizer circuits; descriptions of frequency synthesizers: 26 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

Noise improves sensor performance 05.09.2020

The addition of noise to amplify a weak signal is a perceptual phenomenon common in the animal kingdom, but uncommon in human-made sensors. Now the Pennsylvania researchers have added a small amount of background noise to amplify very weak signals in a light source that is too dim to perceive.

Unlike most sensors, for which noise is a problem that needs to be suppressed, the scientists found that adding just the right amount of background noise can actually amplify a signal too weak to be picked up by conventional sensors to a level at which it can be detected.

Although their sensor, based on a two-dimensional material called molybdenum disulfide, detects light, the same principle can be used to detect other signals, and since it requires very little power and space compared to conventional sensors, it may find wide adaptation in the near future. The Internet of Things will expand the sale of tens of millions of sensors to monitor conditions in homes and factories, and low power consumption will be a strong bonus.

This phenomenon is often observed in nature. For example, a paddlefish (a type of freshwater ray-finned fish) that lives in muddy waters cannot find its food, which is a phytoplankton called daphnia, with the help of vision. The paddlefish has electroreceptors that can pick up a very weak electrical signal from Daphnia at a distance of up to 50 meters. If you add a little noise, the paddlefish can find Daphnia at a distance of 75 or even 100 meters. This ability adds points to that animal's evolutionary success.

Another interesting example is the borer beetle, which can detect a forest fire at a distance of 50 miles. The most advanced infrared detector can only do this at a distance of 10 to 20 miles. This is due to a phenomenon these animals use called stochastic resonance.

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