Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library

Free library / Schemes of radio-electronic and electrical devices

Silent antenna tuning. 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

When working on the air on transceivers with a transistor output stage, radio amateurs usually use matching devices that require significant power emitted on the air at the time of tuning to tune to the minimum SWR, which is not very good and convenient. The level of the signal emitted into the air according to the proposed method [1] does not exceed 10-12 W.

Figure 1 shows a diagram of a directional coupler. The matching device connected to it is tuned to a minimum of noise in the receiver.

Silent Antenna Tuning

Transformer T1 is made on a ferrite ring K7...12 with a permeability of 20...50. The number of turns is 10, the branch is from the first turn, the winding is in the 270° sector. K1 - antenna relay in the transceiver.

The directional coupler loss (0,5 dB) is negligible. Resistor R (15 ohms) is balanced by a minimum of noise with a matching device pre-configured in the traditional way.

Figure 2 shows a diagram of the noise generator.

Silent Antenna Tuning
Fig. 2

Almost any noise generator can be used. The use of "tonalnik" is desirable. With some skill, working with such a device is very convenient, especially for visually impaired people.


  1. Radio, 1981, N10, p.57.
  2. Handbook-94, pp.26-5.

Author: A.Kuzmenko (RV4LK); 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

Harm of Wi-Fi networks 21.04.2018

An experiment was conducted in Denmark on the influence of Wi-Fi connections and mobile devices on living cells of organisms. The studies were carried out by schoolgirls, but as a result, their studies were of keen interest to respected biologists and radiologists in society.

For the study, the girls laid out about 12 watercress seeds in 400 trays. After that, half of the trays were taken to another room. It is noted that the seeds received the same amount of fertilizer, light and moisture. During the study, schoolgirls installed Wi-Fi routers in one of the rooms. The young scientists reported that they had acquired an installation similar to the type of radiation, which exactly coincides with mobile devices.

The girls' research surprised them, teachers, and scientists alike. In just 12 days, clear signs of harm from radio waves have already been observed. During the experiment, it is noted that the seed sprouts, which were located near the router, looked much worse than those located in another part of the house. It should be noted that most of the sprouts where there was Wi-Fi access died.

Other interesting news:

▪ Baseline Study, Google Genetic Project

▪ Smart backpack for the visually impaired

▪ black tomatoes

▪ soil radar

▪ 20 new moons of Saturn discovered

News feed of science and technology, new electronics


Interesting materials of the Free Technical Library:

▪ section of the site Radioelectronics and electrical engineering. Article selection

▪ article Your mournful work will not be wasted. Popular expression

▪ article Where did the name of the women's bikini swimsuit come from? Detailed answer

▪ article Electrician of dispatching equipment and teleautomatics. Standard instruction on labor protection

▪ article Automatic humidity controller. Encyclopedia of radio electronics and electrical engineering

▪ article Shaking off ink. Chemical experience

Leave your comment on this article:


Email (optional):

A comment:

All languages ​​of this page

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