Collinear 160m antenna. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Collinear 160m antenna. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / HF antennas

Comments on the article

The most common 160-meter antenna is a half-wave dipole, which has some directivity: the maximum of its radiation is perpendicular to the axis of the vibrator.

When several vibrators are arranged in a row and are excited synchronously, the direction of the radiation maximum does not change, but the width of the main lobe of the radiation pattern decreases significantly. Such an antenna has a higher gain than a single half-wave dipole. The more radiating elements the antenna contains, the narrower the main lobe of the diagram turns out and the larger the gain. If the number of elements exceeds two, then small sidelobes appear in the diagram.

Modernization of the antenna comes down to the fact that half-wave vibrators are connected to the ends of the dipole through short-circuited quarter-wave segments. Short-circuited quarter-wave segments (stubs) rotate the phase by 180° and represent a parallel resonant circuit connected between half-wave vibrators. The gain of such an antenna with respect to a half-wave dipole is 3,4 dB. The antenna is powered by current, and therefore its input impedance is 300 ohms. This allows the use of a symmetrical supply line.

The length of each vibrator is l=0,485l. The length of the loops (two-wire in a tape dielectric) l=0,205l.. The length of the loops when using a cable - l=0,165l.

160m Collinear Antenna

I use a three-element collinear antenna, located at an angle of 45 °, the height of the lower end is 6 m, the upper end is 150 m (very good QTH, next to it is a TV mast).

The antenna sheet is made of bimetal with a diameter of 4,2 mm, the loops are made of a crossover wire (used on automatic telephone exchanges), twisted with little tension and wound into coils tied with a dielectric (see figure). The beginnings of the wires in the bay are soldered together, and the ends are soldered to the vibrators. The loop bandwidth is about 200 kHz, the rolloff at the edges is 1 dB, which is quite enough for the 160-meter band. Structurally, the loop is put on the antenna sheet and is fixed between the insulators. The antenna is powered by a long, about 80 m, coaxial cable with a characteristic impedance of 75 ohms. SWR at resonance is 1,05, and at the edges of the range - 1,8. If all the indicated dimensions are met, the antenna turns out to be tuned to the middle of the range, the tuning comes down to tuning the loops to resonance in the middle of the range, which is most conveniently done with the XI-42 device.

The antenna has been used for two years. During the operation of the antenna, SSB QSOs were made with many DX stations - VE, VK, N, 8P and others. We used a UW3DI-II transceiver with a GU-19 in the output stage.

Literature

1. Benkovsky 3., Lipinsky E. Amateur antennas KB and VHF: a Handbook. - 1983. - S.283.
2. Rothammel K. Antennas: A Handbook. - 1979. - S. 198.

Author: N. Meshkov (RZ9YN), Altai Territory. Blagoveshchensky district, Stepnoye Ozero village; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section HF antennas.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

NEC: the world's first HD-DVD drive 14.01.2006

NEC commercializes the HR-1100A, the world's first HD-DVD drive.

Of course, not only them, but also all previous generations of optical discs, including DVD and CD. The device uses the know-how of NEC - an optical head that can use both blue and red lasers. The drive is not able to write.

The price of the device has already been announced, it is 500 euros. The HR-1100A will be available to order as early as October, but will not ship until January 2006.

Other interesting news:

▪ New TOSHIBA DVD Recorders

▪ The Earth and the Moon are formed from similar materials

▪ Signal circuit boards found inside human cells

▪ Epson PowerLite Home Cinema 2 3D/2030D projector

▪ Reduced GNSS modules for wearable devices

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Wonders of nature. Article selection

▪ article Tripods: what we stand on. video art

▪ article How did the prophecies of Thomas Robert Malthus, a pioneer in the field of demography, come true? Detailed answer

▪ article Head of Retail Department. Job description

▪ article Sound amplifier for a subwoofer to a computer. Encyclopedia of radio electronics and electrical engineering

▪ article Miniature power supply, 5-12 volts. 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