CB antenna on the window. Scheme, description

Free technical library

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

CB antenna on the window. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / VHF antennas

Comments on the article

The owner of a CB radio station, installing an antenna on the roof of a house, not only spends considerable money on this, sometimes comparable to the cost of the station itself, but also listens to the complaints of many, not always friendly people. To some extent, the problems arising here are removed by balcony antennas "Boomerang". But there is another way out: the design of a full-sized CB antenna, the so-called "half wave", which can be installed on the window of an apartment, is described below.

As an antenna, it is recommended to use a telescopic fiberglass rod, on which a piece of flexible wire is fixed. An example of the placement of such an antenna is shown in Fig. 1.

CB antenna on the window

There are many ways to attach a fishing rod to a window. One such mounting option is shown in Fig. 2. Here: 1 - sliding glass-plastic rod 6 m long; 2 - thrust bearing (Fig. 2, b) attached to the vertical post of the window frame; 3 - hard or soft braces that fix the antenna in the desired position; 4 - vibrator 5,24 m long, made of wire type MGV or MGSHV with a value of 0,2 ... 1 mm2, 5 - matching device in a waterproof cover; 6 - coaxial cable brand RK50-2-16; 7 - 5-10 ferrite rings (permeability 50 ... 2000) pulled over the coaxial cable.

CB antenna on the window

A schematic diagram of a matching device that lowers the high active resistance "half wave" to 50 ohms is shown in fig. 3a. The L1 coil is frameless, wound on a mandrel with a diameter of 8 mm with PEV-2 1,5 wire. The number of turns is 9, the winding length is 19 mm. Capacitors - type KSO-1.

CB antenna on the window

The matching device is assembled on a printed circuit board made of one-sided foil fiberglass 2 mm thick (Fig. 3b). It is placed in a protective case glued from impact-resistant polystyrene (Fig. 3, c).

The vibrator is laid along the rod, fixing it at the end of each knee with electrical tape. In the window frame and in the window sash, a round file with a diameter of 4 ... 5 mm is used to make matching cuts to pass the coaxial cable. This will allow, by installing the antenna, to lock the window tightly.

The antenna is tuned in the usual way: by squeezing and expanding the turns of the L1 coil, they achieve a minimum SWR in the middle of the operating frequency range. To achieve an SWR of 1, it may be necessary to change the length of the vibrator and (or) the capacitance of capacitor C2 within very small limits (3 ... 2%).

As experience has shown, the antenna is not inferior in "range" to the full-size "Boomerang". The band of its operating frequencies (in SWR less than 1,5) is 300-400 kHz.

Author: Yu.Vinogradov, Moscow

See other articles Section VHF antennas.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

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. ... >>

Random news from the Archive

Wireless data transmission 1 terabit per second 26.02.2015

Researchers at the UK-based 5G Innovation Center of Surrey seem to have set a new record. Most recently, they tested equipment that provides wireless data transmission at speeds of more than 1 terabit per second with minimal latency.

This is truly an achievement that surpasses previous results - for example, 7,5 Gb / s achieved in Samsung laboratories. But more importantly, new systems have made it possible to reduce network delays to a value in the region of one millisecond.

True, in this mode they were tested at a distance of no more than 100 meters in laboratory conditions. The result has been confirmed and recorded, and now the researchers plan to conduct a series of tests in real conditions, which is scheduled for next year. And in 2018, it is planned to hold a public demonstration of the new communication technology.

As one of the project participants noted, the most important aspect of fifth generation (5G) networks will be long-term support for new applications. It is not yet known which applications will be used in 2020, 2030, and even more so in 2040, but one thing is clear - they will be very demanding on latency.

There is a lot of work to be done in the coming years before such speeds become a reality, as it will require a completely new infrastructure and new technologies that can fit in smartphones, but at the same time support such a fast data transfer. In the meantime, many LTE-enabled smartphones do not support all the capabilities of even fourth-generation networks (4G), and the LTE-Advanced standard allows you to download data at a speed of about 1 Gb / s for stationary receivers and around 300 Mb / s for mobile users.

Other interesting news:

▪ Charging implants with ultrasound

▪ Cats get irritated when people ignore them

▪ artificial ear

▪ Magneto-optical disk stores up to 1 GB of information

▪ Meizu 10 mAh power bank with fast charging technology

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Regulators of current, voltage, power. Article selection

▪ article Management Theory. Crib

▪ article Which female name familiar to us was originally male? Detailed answer

▪ article Edible coleus. Legends, cultivation, methods of application

▪ article solar power generator. Encyclopedia of radio electronics and electrical engineering

▪ article Alteration of the Len-M radio station at 29 MHz - FM. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Comments on the article:

Andrei
The balcony is better. It is worse on the wall than on the roof - there will be higher and lower exposure of people, as well as pickups on the power grid and consumer electronics. Better a shortened pin on the balcony and a counterweight - an iron visor.

All languages of this page

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