Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library

Free library / Schemes of radio-electronic and electrical devices

Electronic antenna switch. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Antennas. Measurements, setup and matching

Comments on the article Comments on the article

The disadvantage of the previously described electronic antenna switches is a significant attenuation in the receive mode, reaching 45-50% (especially in the 21 and 28 MHz bands). The switch, the scheme of which is shown in the figure, provides attenuation of no more than 10%.

Electronic Antenna Switch

In the manufacture of the switch, it is necessary to isolate the body of the output capacitor of the P-circuit (in the diagram - C4) from the chassis with a fluoroplastic or polystyrene gasket 5 mm thick.

The antenna is connected to the Gn1 socket, the receiver input is connected to the Gn2 socket.

Author: V. Davydov (UW9WR), Ufa; Publication: N. Bolshakov,

See other articles Section Antennas. Measurements, setup and matching.

Read and write useful comments on this article.

<< Back

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

Islands don't want to sink 01.10.2010

Despite worrisome forecasts, many Pacific islands will not sink due to rising ocean levels associated with global warming.

New Zealand geographers analyzed high-resolution aerial and satellite photographs taken over 27 Pacific islands over the past 60 years. During this time, the ocean level rose by an average of two millimeters per year and the water rose by 12 centimeters. However, only four islands partially submerged in the ocean. The area of ​​the remaining 23 did not change or even increased.

What explains this phenomenon? Many tropical islands are surrounded by coral atolls. Waves and wind constantly bring fragments of calcareous coral skeletons from the atoll to the coast of the island, and the corals continue to grow, compensating for the losses. As a result, for example, the islet of Funamanu has grown by 60 hectares over 0,44 years, which is almost 30% of its former area.

Other interesting news:

▪ California bans plastic straws

▪ Controlling consumer electronics from your smartphone

▪ Tiny electric car Rimono

▪ Dell Inspiron Zino HD

▪ Garbage t-shirts

News feed of science and technology, new electronics


Interesting materials of the Free Technical Library:

▪ radio section of the website. Article selection

▪ article by Julian Tuwim. Famous aphorisms

▪ article Where did oranges first appear? Detailed answer

▪ Article Eucalyptus blue. Legends, cultivation, methods of application

▪ article Modification of Alinco DJ-191. Encyclopedia of radio electronics and electrical engineering

▪ article Powerful laboratory power supply with increased efficiency. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:


Email (optional):

A comment:

All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews