Antenna design Double square. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / VHF antennas
Comments on the article
The appearance of the "double square" antenna mount of the "hedgehog" type is shown in the figure. The basis of the design is four five-meter pine slats 1-4. They are not interrupted in the center, but run tangentially to the mast 5. Each rail consists of three identical segments with a diameter of 35 mm, connected end-to-end.
The design of the knot is supplemented to the size of a square of a twenty-meter range with spruce (bamboo, walnut, etc.) rods about two meters long, attached to the ends of the rails with two clamps made of thin steel.
The entire assembly is fastened with four steel corners 6 and two traverses 7 (steel corner with a section of 35x35 mm). The traverses are attached to the mast with U-shaped studs, to the corners 6 - with bolts or welding.
Author: N. Smirnov (UA3VBA); Publication: cxem.net
See other articles Section VHF antennas.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
The world's tallest astronomical observatory opened
04.05.2024
Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>
Controlling objects using air currents
04.05.2024
The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>
Purebred dogs get sick no more often than purebred dogs
03.05.2024
Caring for the health of our pets is an important aspect of the life of every dog owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>
| Random news from the Archive Life could have originated on Titan
12.02.2011
Saturn's largest moon, Titan, has a dense atmosphere composed mostly of nitrogen with a dash of methane.
At the Central School of Engineering in France, an international team of researchers irradiated the same mixture of gases with microwaves, simulating the constant bombardment of Titan's upper atmosphere by ultraviolet rays from the Sun and charged particles flying from the sun and deflected towards Titan by Saturn's magnetic field. After some time, rather complex organic molecules were found in a steel vessel containing a mixture of gases - the nucleotides cytosine, adenine, thymine, guanine and uracil, which are part of DNA and RNA.
In addition, simple amino acids - glycine and alanine, which are part of proteins, were spontaneously synthesized. A haze of unknown composition floats in the upper atmosphere of Titan, making it impossible to see the surface of the satellite.
It is possible that over millions of years of evolution in this thickness of aerosols, not only molecules were formed that are part of all living things on Earth, but also some microscopic organisms. In any case, the existence of life is excluded on the surface of Saturn's moon: the temperature there is about minus 180 degrees Celsius.
|
Other interesting news:
▪ Traces of ancient tides
▪ Sensor for diagnosing diseases by sweat
▪ Fastest laptop graphics processor from Nvidia
▪ Cassette with music
▪ Electronics printed on fabric
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Your stories. Article selection
▪ article And the oyster has enemies. Popular expression
▪ article What is the caste system? Detailed answer
▪ article Work on a machine for wrapping books in dust jackets such as BZSP, etc.. Standard instructions for labor protection
▪ article A simple electronic fishing rod. Encyclopedia of radio electronics and electrical engineering
▪ article Power amplifier, made according to the bridge circuit. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese