To date, car antennas have a different purpose. In combat time, they catch a connection, and in peaceful - navigation information and broadcasting channels. Due to the simplicity of the design, the automotive antenna can be made independently. About this further in the article.

Car Antenna, Device and Purpose

Automotive antenna They call a special device that receives electromagnetic radio signals and converts them to an electrical signal. To make an antenna for cars with your own hands, it is necessary to determine the type of modulation, the wave range and the appointment of the device. These are three key components that are laid in the design.

Types of automotive antennas for appointment

1. Connected car antennas.
2. Taking broadcasting.
   
3. Receiving broadcasting.
   
4. Receiving satellite data for navigation systems.
   

Types of automotive antennas by installation method

1. Embedded.
2. On clamp.
3. On a threaded connection.
   
4. Curling.
   
5. On the suction cup.
   
6. Magnetic.
   

Types of automotive antennas at the place of attachment and type of strengthening

By type of amplification, the following types of automotive antennas distinguish:

1. Passive.
   
2. Active.
   

At the place of fastening:

1. Salon (internal) car antennas.
   
2. External.
   

Principle of operation of a connected car antenna

The size of the automotive antenna directly depends on the range. That is why connected antennas at 27 MHz have such large dimensions. The most powerful variations are capable of reaching two meters long, however, according to the rules of science, they must be even higher. To adjust the differences between the quarter of the wavelength and the real size extend extending at the bottom of the coil.

A connected antenna is installed onto the cars vertically, which is due to the polarization type. It is worth noting that all connected antennas are capable of tilting through the lever in certain road conditions, for example, to defeat the flight of a low bridge or do not break in the forest. As a rule, connected antennas use owners of large trucks. Mounting for jeeps and other cars is allowed, however, the view will not be very attractive.

Digital automotive antenna, principle of operation

Digital car antennas for tv receiving, as a rule, look like police flashers, but are made in another color decision. There is nothing complicated in their device, they simply should take the frequency of about hundreds of MHz. For example, the first multiplex in Moscow is located at a frequency of 559 MHz.

Digital car antennas on the magnet, as a rule, are placed on the roof, and the wire runs directly above the door without various modifications. The signal is characterized by the presence of horizontal polarization, the main task of the device is to take it from each azimuth.

Radio broadcasting antenna

Radio broadcasting antennas are both "flashers" and low height pins, like those that take signal signals, but a little shorter.

Technical characteristics of radio frequencies, television, navigation, radio communications

1. Radio communication - SV (about 27 MHz).
2. Navigation - GPS (about 400 MHz).
3. Television - DVB-T (up to 900 MHz).
4. Radio - FM or AM (about 70 - 108 MHz).

Also pay attention to the connector. As a rule, it coincides with most devices for which it is intended, but it will not be superfluous. It is believed that the external antenna catches better, but this applies only to the reception in the city. On the country tracks, the glass of an ordinary passenger car is not able to create serious obstacles. However, intra-alone car antennas are easier to install. It is worth noting that they are below the outdoor, which affects the quality.

On the market you can find various hybrid models. In addition, it is possible to switch reception from the city to the highway. Their difference in the features of suppressing interference and sensitivity, due to which the reception range outside the city increases significantly. There are also peculiar tandems - a couple of similar pins, the first of which is television, and the second - radio or connection. Undoubtedly, to use all the advantages of the set, in stock you need to have appropriate receiving equipment.

Tools, materials and adaptations to help the master

1. Cable RK - 50.
   
2. Condenser 5 - 25 PF.
3. MGTF 0.5 wire.
   
4. Soldering iron.
5. Conduit.

Automotive antenna do it yourself, step-by-step instructions

It is worth saying that the car body is constantly in motion. That is why ordinary terrestrial household antennas will have in this case dead reception zones. When maneuvering, there will be quite a long period of time when the reception will be absent. This refers to horizontal polarization. When the vertical does not matter where the signal comes from.

With the independent manufacture of the automotive antenna, the framework is used, which must be paved under the rear window seal. It is a little alone to the top and has some other sizes, rather needed at a frequency of 27 MHz. That is why the center is a capacitor, which makes the adjustment of the automotive antenna on the desired channel in the resonance.

There are two reception frequencies, for example:

1. 28.2 and 68 MHz
2. 27 and 65 MHz.

The upper resonance is necessary for the lower range of broadcasting. Automotive antenna scheme:

1. MGTF 0.5 trapezium wires should be paved along the perimeter of the rear window - the sidewalls 22.5 + 22.5 and 45 cm, the lower line 66.5 + 66.5 cm, the upper face 56.5 + 56.5 cm.
2. The advantages are where the wires for the appropriate capacitor will be added and the RK cable shot is 50.
3. To the center, in the middle, the glass vertically go two wires, where exactly in the center is attached a trimmed capacitor. The length of each 45 centimeters. They need to be selected by Zigzag and put under the insulating tube.
4. The cable must be soldered from the sidewall, where in the middle cropped wire. Railed from the opposite side should not be.

How to put and connect antenna

Connecting the automotive antenna occurs by means of the connector used by connected equipment. Take a small cable length.

The advantages of the antenna made by their own hands

Such models are usually installed on the roof of the car and have a greater height than the passenger car itself. In the forest, this is a certain plus. Moreover, there is no need to wind the matching device. In this case, the ease of design is achieved, ease of installation and accessibility to any user.

Tips Prof.

In some cases, the acquisition of a car antenna and its installation is more expensive, more complicated and provides smaller reception quality. In the design below, there is nothing complicated and every car enthusiast can try it in the case.