Designs of decimeter antennas. How to make a digital television antenna with your own hands for the garden and at home

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Being far outside the city, where you rarely see a house with satellite dish, and there is no way to connect cable TV, sometimes you wonder how to make an antenna for a TV with your own hands.

Indeed, anything can happen to an old antenna. The cable is damaged, the signal is lost, the wire comes loose and you are left without television. The situation is unpleasant, but, as it turns out, it is quite fixable. This problem can be solved if you manage to build an indoor antenna using improvised materials and, perhaps, without even resorting to a soldering iron.

The easiest way to make a TV antenna

Living in an apartment building, we are not immune from problems with possible absence TV broadcasts. But the problem can be solved quickly and quite effectively. To do this, we need copper wire and a knife. Using a knife, we strip both ends of the wire and tie one of them to the heating battery, and insert the other into the socket of your TV.

We turn it on and check the signal. The central heating radiator extends to the roof, thereby increasing the signal, so we, of course, cannot guarantee a hundred channels, but such an antenna will pick up 5-7 and provide a fairly high-quality display.

TV antenna made of aluminum cans

An ignorant person is unlikely to realize that a do-it-yourself indoor antenna can be made from ordinary beer cans or Coca-Cola cans. Moreover, this method has been known for a very long time. For this we will need the following items:
1. Two aluminum cans.
2. Brass, copper wire or old tv cable.
3. Triangular clothes hanger.
4. Soldering iron (for structural strength and signal improvement, but you can do without it).
5. Knife.
6. Electrical tape, scotch tape.

Manufacturing process of a can antenna

We rinse the jars and dry them thoroughly. Then we fix the hangers on the edges so that they fit against the bottom side. It is best to secure the cans using adhesive tape or electrical tape, but you can also use other available means. The banks need to hold up well.

Then, we strip the ends of the wire or cable on both sides and thread their ends through the ears, with the help of which the cans are opened. We press these ears to the lid of the jar and insert the other end of the cable into the connector.

Note!

For structural strength, the wire can be soldered to the can and these places can be insulated.

To increase the number of channels, you need to use jars of larger diameter.

TV Antenna UHF and VHF

If you have some skills in working with a soldering iron, then you can easily assemble an antenna for a TV with your own hands for the decimeter and meter ranges. The design does not require engineering skills and to create it we will need: 1. A copper wire 80 cm long and up to 3 mm in diameter. 2. Double-sided fiberglass. 3. Coaxial cable up to 2 meters long and with a resistance of 75 Ohms. 4. Plug.

The procedure for manufacturing a decimeter antenna

First, you need to find a copper wire with a diameter of 2-3 mm. A single-core cable used when installing electrical wiring is most suitable for this. If you find a stranded wire, you need to separate one core without damaging the insulation. As a last resort, you can use aluminum wire. If there is no insulation on the wiring, then for aesthetics, it can be put into a tube, for example, made of vinyl chloride. Then, make a circle with a diameter of 22 cm from the wire. For the convenience of making such a circle, you can use any container of a similar diameter.

Board assembly

To continue assembling such an antenna for television, you will have to make the board yourself. There is nothing complicated about this. We take a piece of PCB measuring 2.5*3.5 cm and a thickness of 1.5 mm, and place copper wire tracks on its surface, also as indicated in the diagram.

Board assembly diagram

The wire diameter should be within 0.4 mm. It can be attached to the board using glue. To reduce external influences and give our design beautiful view, we hide our board in a box made of plastic or metal, having previously drilled holes for the ring and cable. After these preparatory work, we begin to assemble the structure.

Assembling the TV antenna structure

We tin the ring ends with solder and put them into our box with the board. Then we bend them at a right angle, bring them to the board and seal them. After this, we turn the board to face the bottom of the box and begin preparing the cable. To do this, install a plug on one end of the cable, and disconnect the other and solder it to the board on the reverse side. We fix one of the ends, the central core, to the right end of the ring, and solder the second to the board of our product. After these manipulations, the design is ready. We insert the plug into the TV socket and configure the channels.

DIY TV antenna for digital television

Knowing how to hold a soldering iron and a screwdriver in your hands, you can make an antenna for digital television, which will be of higher quality than many Chinese analogues that have flooded our market and, most importantly, practically free. For this we will need the following items: 1. A board 7 cm wide and 55 cm long. 2. Copper wire, 39 cm long and the diameter of the central core is 4 mm. 3. Self-tapping screws in the amount of 10 pcs. 4. Pencil, ruler, knife. 5. Plug.

First, take a board of the required size and make markings according to the diagram:

Construction order

Dimensions are in inches. To convert to centimeters, multiply by 2.5 and round to the nearest tenth. For example, 2 and 5/8″, when multiplied we get 6.56, rounded to 6.6 cm. Then we cut our wire into 8 parts and get pieces of 37.5 cm. On each piece we make cuts 2 cm long, for connections, and clean them. After this, we cut two more wires of 22 cm each and strip them in the places where connections will be made. We bend the wires, which we previously cut into 37.5 cm, into a V shape so that the distance between the edges is 7.5 cm.

The final stage of antenna assembly

Now, so that we can get a real one TV antenna for digital television, you need to complete the assembly correctly. To do this, we need to buy a plug with a coil inside and begin the process of connecting the coil to the cable. The cable is connected to the coil through the lower contacts. After this, we complete the antenna assembly by screwing two wires, 22 cm long, to the central screws. On the other hand, we attach these wires to a plug with a coil, which, in turn, must first be attached to back side planks. That's it, the reel is ready for use.

Frame wave channel

To make such an antenna, take copper wire and bend a frame from it. The side of the frame should be about 10 cm. At the junction of the ends, we tie them using the “pigtail” method. After this, after 2 cm, we begin to twist the same frame, connecting the ends in a similar way.

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How to make an antenna for a TV for reception in the UHF range with your own hands? This question is asked by those who like to do everything with their own hands. Both at home and in the country, the antenna will allow you to watch TV digital format without having to buy a factory-made antenna.

Antenna for digital TV

Digital terrestrial television- this is a transfer TV signal using digital coding, which ensures its delivery to receiver with minimal losses. Accordingly, the TV must support a technology called DVB-T2. For confident reception You need a special antenna, which you can buy or you can make yourself.

There are currently a large number of methods for making antennas with your own hands. Let's look at the simplest and most common ones.

From beer cans

A simple decimeter indoor TV antenna can be made from beer cans.

To manufacture an all-wave homemade antenna of this design, you will need the following materials, components and tools:

2 tin cans of 750 or 1000 ml;
coaxial television cable (RK75);
antenna plug;
electrical tape or tape;
metal screws;
a polypropylene pipe or wooden stick for attaching cans to it;
screwdriver;
wire cutters;
needle file;
ruler.

TV antenna made from beer cans

How to make an antenna from beer cans? The manufacturing algorithm is as follows:

using a screwdriver, make 1 hole in the neck of each can, making sure that it does not become deformed;
screw the screws into these holes using a screwdriver;
clean the ends of the cable with a knife, not forgetting to remove the varnish from the copper wire with a file;
screw the wire and cable braid twisted into a ring to the self-tapping screws (it will be more reliable if it is welded or soldered, but this is only if you have the appropriate tool);
Securely secure the cans to a pipe or stick using electrical tape or scotch tape for these purposes, maintaining the distance between the cans (it has long been established experimentally, and this size is 7.5 cm);
Attach a plug to the other end of the cable, which will connect the cable to the receiving device.
place the antenna in the required place, i.e. where signal reception will be ideal.

The most painstaking work is preparing the RK75 cable. One end must be cleaned from the top shell at a distance of 10-12 cm with a knife without damaging the copper braid. Next, you need to twist this braid into a pigtail and remove the aluminum screen. After this, cut off the polyethylene sheath by 6-7 cm and expose the central core. The resulting copper strand and bare core are then attached to the cans.

The second end of the cable must also be cleaned and a plug consisting of 2 halves must be connected to it. The central core of the cable passes through the hole in one half of the plug, and the braid is connected to the plug body. Both halves are screwed on one another, and you get a reliable device for connecting to the antenna socket of the TV.

If you plan to place an antenna made from tin cans outdoors, then it must be reliably protected from external weather influences. Plastic bottles are suitable; you need to cut off the neck and bottom and place the antenna elements in them. In such conditions, it will reliably carry out the functions assigned to it.

This one is the simplest broadband antenna, made from scrap materials without the use of special tools, it is done quickly. You can make it yourself and install it in 20-30 minutes. You can make sure that your homemade antenna receives most channels satellite television, including TVB-T2. At a minimum, it receives up to 15 channels.

Figure 8

Home satellite antenna may be in the form of a figure eight. It can also be used for outdoor installation. Works without an amplifier.

Figure 8 TV antenna

To make a figure eight antenna you will need:

copper or aluminum wire Ø 3-5 mm;
coaxial television cable RK75 (can be replaced with a densely braided cable with a resistance of 50 Ohms);
antenna F-plug;
screwdriver;
knife or scalpel;
glue gun;
soldering iron;
solder;
flux paste;
ruler;
wire cutters;
pliers;
needle file;
a solid base (a plastic lid will do).

The manufacturing procedure is as follows:

cut 2 pieces of wire, 56 cm each;
at each end, after exposing the central core, make a loop (approximately 1 cm on each side will be spent on making it);
bend the wire into a square using pliers, connecting the loops;
put on one side of the coaxial cable antenna plug, before carefully twisting the braid and exposing the central core;
Solder the second side of the cable to 2 squares as follows: the central core to one square, and the braid to the other at a distance of 2 cm;
place everything in the lid and fill it with glue.

The picture shows how to do this correctly.

Making a figure eight antenna

Such an antenna can be placed anywhere, and this is its main advantage; you just need to choose the right cable dimensions. You need to know that you don't need an amplifier to operate it. It makes sense to install it on the antenna, with a cable that has a significant length to compensate for losses.

From a cardboard box

A simple satellite antenna for TVB-T2 is made using a cardboard box. To make it you will need:

cardboard box (can be used as a shoe box);
foil;
antenna F-plug;
screwdriver;
knife or scalpel;
glue;
ruler or tape measure;
wire cutters;
needle file

Such a simple homemade indoor antenna will provide high-quality TVB-T2 reception.

Butterfly

A DIY all-wave television antenna can be like a butterfly. Such an antenna is no different from a regular decimeter antenna. Easier to redo simple antenna type of grille, which can be bought at a low price in a retail chain, for a digital one, which will receive satellite (T2) channels. To make it yourself you will need the following materials, components and tools:

board or plywood measuring 550x70x5 mm;
copper wire with a central core Ø 4 mm;
metal screws;
coaxial television cable RK75;
antenna F-plug;
screwdriver;
knife or scalpel;
soldering iron;
solder;
flux paste;
ruler or tape measure;
wire cutters;
pencil.

TV antenna in the form of a butterfly

Manufacturing stages:

Mark the board as shown in the figure:

Board for antenna in the shape of a butterfly

To convert measurements in inches to cm, remember that 1 inch equals 2.5 cm.

cut 8 wires 37.5 cm long;
strip the middle of each wire by 2 cm;
bend each wire in a V shape so that the distance between the wires is 7.5 cm;
cut 2 wires 22 cm long;
strip these 2 wires where they are attached to the board or plywood;
assemble all the wires using self-tapping screws, as shown in the figure;

Making a butterfly antenna

Connect the antenna to the cable using a special plug.

Connecting the antenna plug to the cable

From coaxial cable

Exists UHF antenna with your own hands, made from coaxial cable. To make such a simple antenna you will need:

coaxial cable RK75;
plexiglass or plywood;
matching device;
antenna plug;
pliers;
wire cutters;
scotch;
ruler;
pencil.

TV antenna made from coaxial cable

Manufacturing stages:

cut a piece of cable 530 mm long;
strip the pieces of cable from both sides, exposing the central core and connecting the braid into a pigtail;
twist it into a ring (possibly in the form of a diamond) and secure it to a piece of plexiglass or plywood with tape, leaving a distance between the ends of the cable of approximately 2 cm;
Make a horseshoe-shaped matching device from a piece of coaxial cable 175 cm long. To do this, you need to strip the ends of the cable in the same way as when making a ring;
prepare antenna cable. Place the plug on one side and strip the other side until the central core and braid are exposed;
align the ends of the ring wire with the matching device and the cable going to the antenna, which will then be connected to the television receiver using a plug.

Homemade antenna. Video

A visual aid on how to make a homemade antenna for digital TV is presented in this video.

DIY antennas for reception digital signal easy to do. In terms of reception quality, they are no worse than factory antennas with an amplifier, and their cost is much lower. They can be used in apartments, private houses and country houses. Anyone can make them from scrap materials, you just have to delve into the manufacturing technology.

High-quality antennas have always been difficult to obtain - the Soviet industry practically did not produce them, so people made them themselves from improvised materials. Today the situation has practically not changed - in stores you can only find lightweight aluminum Chinese crafts that do not show good results and rarely live more than a year. What to do if you like to watch TV, but there is no quality reception? The answer is simple -Given free time and a pair of skillful hands, anyone can handle this.

Quite recently in Russia there was analog television, but now almost the entire country has switched to digital broadcasting. Its main difference is that it operates in the decimeter range.

Create a homemade antenna for digital range possible at home

This was done for reasons of economy and safety - maintenance of transmitting antenna-feeder stations is virtually not required, their maintenance is reduced to a minimum, and the harm from contact with powerful transmitters for masters is minimal. But such stations have one serious drawback - low power. And if in a big city the signal can often be caught even for a segment copper wire, reception may be difficult away from the transmitter. If you live outside the city, in remote areas or villages, you will have to assemble your own antenna and take it outside to catch the desired signal.

Attention:Signal problems can occur even in the city center. Decimeter waves are practically not dampened by other sources, but are reflected from thick reinforced concrete walls. In modern high-rise buildings there are many places where they are completely attenuated before reaching the TV receiver.

It is also worth noting that DVB-T2 ( new standard television) offers a fairly constant, but weak signal. When the noise level is one and a half to two units higher than normal, the TV reproduces the broadcast quite clearly, but as soon as the noise exceeds 2 dB, the signal disappears completely. Digital television is not sensitive to electromagnetic interference - it is not knocked down by a running refrigerator or microwave. But if a mismatch occurs anywhere in the system, the picture stops or falls apart. High qualitywill solve this problem, but in some cases it will have to be taken outside or onto the roof.

Basic requirements for antennas

The current television standards in the USSR do not fit modern realities - the protective and directional coefficients today have practically no effect on the signals. The airwaves in cities are clogged and contain a lot of dirt, so you shouldn’t pay attention to these coefficients. You are guaranteed to get interference on any antennas, so there is no need to reduce the efficiency factor and efficiency factor. It is better to improve the antenna gain so that it receives a wide range of airwaves and selects the desired stream, rather than focusing on a specific signal. The processor of the set-top box or TV itself will isolate the necessary signals and create a normal picture.

Classic Polish antenna with amplifier

So, Experienced engineers recommend building band antennas. They must be correctly timed when receiving signals in the classic way, and not through engineering “optimizations” and traps. The ideal option is that the device fully complies with theoretical calculations and geometry. Also, the constructed antenna must be consistent with the cable at operating ranges without the use of matching devices. In this case, it is best to create a frequency response that is smooth and even, since when the amplitude-frequency response dips or jumps, phase distortions appear.

Attention: analog Antennas with ferrite USS, which provide full reception of the old signal, practically do not work with DVB. You need to build a “digital” antenna.

In the article we will analyze modern types antennas working with new digital broadcasting.

Antenna types

DIY antennas for digital TV Can you assemble it at home? There are three most common options:

All-wave, or as radio amateurs call it, frequency-independent. It is assembled very quickly and does not require high knowledge or specialized tools. Well suited for the private sector, villages, dacha cooperatives - where the airwaves are not clogged with garbage, but not too far from the transmitter.
Log-periodic range. It has a simple design and receives the signal well at close and medium distances from the transmitter. Can be used as a remote antenna if the transmitter is located far away, or as a home wall antenna.
Z-antenna and its variations. Many radio amateurs are familiar with meter-long “zeshki” - they are quite large and require a lot of effort to assemble. But in the decimeter range they are quite compact and do their job well.

Nuances of construction

If you want to build quality antenna, then you must master the art of soldering. You cannot twist the contacts and guides - during operation they oxidize, the signal is lost, and the picture quality deteriorates. Therefore, all connections are soldered.

Such connections are unacceptable - be sure to solder them

You also need to deal with points of zero potential, where currents arise even in the absence of voltage. Experts recommend making them from a single piece of metal, without using welding at all. Even well-welded pieces can make noise at the boundary values, while a solid strip will “pull out” the signal.

Also when creating homemade antenna for digital TV you need to figure out how to solder cables. Today, copper is practically not used for braiding, since it is expensive and quickly oxidizes. Modern braiding is made of steel, which is not afraid of corrosion, but it is very difficult to solder. It should not be overheated or squeezed. For connections, use 36-40 watt soldering irons, flux and light solders. Dip the winding well into the flux and apply solder - it takes up perfectly with this method of application.

All-wave antenna

The all-wave antenna has a fairly simple design. It consists of triangles, copper wire and wooden slats. You can study the design in more detail in the picture - it does not represent anything supernatural.

The thickness of the wire can be any, the distance between adjacent wires is 25-30 mm, the distance between the plates is no more than 10 mm. The design can be improved by eliminating plates and using PCB. It needs to be given the appropriate shape or simply remove the copper foil in the shape of a triangle.

The remaining proportions are standard - the height of the device must match the width, the plates diverge at right angles. Zero potential is on the extreme line home antenna for tv , just at the intersection of the cable with the vertical guide. To avoid loss of quality, the cable must be tied to it with a tie - this is enough for coordination. Such an antenna, hung outside or directed at a window, receives virtually the entire frequency range, but has a slight dip, so you need to set the correct angle when fixing the antenna.

By the way, this design can be modernized using ordinary aluminum beer and cola cans. The principle of its operation is as follows: as the shoulder span increases, the working band expands, although other indicators remain within the original limits. The Nadenenko dipole, often used in military developments, works on the same principle. Aluminum cans are ideal in shape and size, creating vibrator arms in the decimeter range.

Two-can antenna for TV

You can create a simple can antenna by simply soldering two cans to a cable. This DIY indoor TV antenna Suitable for viewing channels at a short to medium distance from transmitters. There is no need to coordinate anything in this scheme, especially if the cable length is less than 2 meters.

You can complicate the design by assembling a full-fledged lattice from eight cans and using an amplifier from a regular Polish antenna. This design is perfect for hanging outdoors in areas remote from the transmitter. To enhance the signal, a metal mesh can be placed at the back of the structure.

Z antenna

Complex Z-antenna designs with multiple loops exist, but in most cases they are not needed. You can easily assemble a structure from ordinary copper wire 3 mm thick. If you don’t have one, then just buy a 3 mm single-core copper wire 120 mm long - this will be enough for your work. This design consists of two segments. We bend the wire according to this pattern:

The starting section is 14 centimeters long. Its edge is bent into a loop to connect with the last one (the loop is 1 cm, the total length of the first piece is 13 cm).
The second piece is bent at 90 degrees (it is better to bend it with pliers to maintain the angles). Its length is 14 cm.
The third piece is bent at 90 degrees parallel to the first, length 14 cm.
The fourth and fifth pieces are 13 cm each, the bend does not reach the loop by 2 cm.
The sixth and seventh pieces are 14 cm each, bent at 90 degrees.
Eighth - returns to the loop, length 14, 1 cm goes to a new loop.

Next, you need to thoroughly strip the two loops and solder them. The opposite corner is also cleaned. The cable contacts are soldered to them - one is central, the other is braided. There is no difference which contact to solder to.. It is advisable to insulate the soldered areas; for this you can use sealants or hot-melt adhesive. The ends of the cable are soldered to the plug and also insulated with cambric.

You can assemble such an antenna in half an hour.

To avoid displacement of segments, the edges can be strengthened. To do this, take a regular plastic cap from a five-liter bottle, cut 4 slits in it so that the wire is recessed to the base. Cut the fifth hole for the cable. Then place the antenna in the cover (after checking the quality and reliability of the soldering), and fill it with hot-melt adhesive. The resulting design will be practically eternal - it is capable of receiving a stable signal at a distance of up to 10 km from the source.

So you already know What can be used instead of an antenna for a TV. In fact, the structures are much larger than those we described, but even these will be quite enough for you. If you live far from the signal source, then you will need amplifying antennas - you can get by with a classic “polka” with amplification. Well, if everything is bad with the airwaves, then use satellites.

Decimeter waves with a length fall within the range of 10 cm - 1 m. This feature serves as the basis for naming devices. At frequency, electromagnetic oscillations propagate predominantly in a straight line, avoiding going around the earth's surface, and are partially reflected by the troposphere. That's why long distance communication UHF is difficult, the range does not exceed 100 km. Can a decimeter antenna be assembled with your own hands? Maybe it is being actively collected by amateur engineers.

Beer cans will receive television broadcast

UHF frequencies are located in the range 300 MHz - 3 GHz. This includes many commercial, public channels.

The program “Cheap and Cheap” taught Muscovites how to catch Channel One. According to available data, it is transmitted by the HF band, the sound is adjacent to FM radio stations, the homemade design demonstrated by the presenter is used by the UHF.

You will need two beer cans with a capacity of 0.5 liters (larger volume, lower received frequencies). You can save money by buying mineral water and juice in cans. To attach the mentioned containers you will need a frame.

Channel One recommends using a wooden board 10 cm in diameter; enthusiasts have come up with a constructive solution. It is proposed to hang the jars on an ordinary wooden hanger. An indoor decimeter antenna made in a similar way can easily be placed on a window handle or a wall nail.

In addition to two beer cans you will need:

A pair of sharp screws (screws) with a diameter of 2-3 mm, a screwdriver.
A piece of coaxial cable from the antenna location to the TV.
One standard jack connector.
A roll of adhesive tape, insulating tape.
A soldering iron, rosin, solder, and a pair of terminals for the screws indicated in step 1 will come in handy.

You should start by sealing the connector and terminals into the wire. The first will be located on the TV side, the second - on the opposite end (core, screen). Both terminals must be separated by 12 cm.

The design of the antenna avoids complications: the cans are secured with a horizontal crossbar with their necks facing each other at a distance of 75 mm from each other. Assembly begins by attaching the terminals to the necks with screws. There is no need to tighten it all the way, the wires should be pressed tightly against the cans.

The containers are secured parallel to each other with tape on a hanger. The homemade decimeter antenna is ready. Having hung the hanger in the place of best reception - first you need to find one - cover it with a curtain and clothes. According to eyewitnesses, the design works, equipped with cans of a more modest displacement. You can actively experiment by changing the distance between the containers and visually assessing the image quality.

Standard TV wire ring

The design will not require anything other than a coaxial cable with a resistance of 75 Ohms (RK 75). An even ring is bent from a piece 530 mm long and reinforced with plywood and plexiglass. High input impedance will not allow you to create direct connection to the TV, a special matching device is used - a U-elbow.

A piece of cable 175 mm long is bent into a U shape. The ends are aligned with the edge of the wire going to the TV on both sides. The structure is fastened with tape or any other suitable material. Three screens are soldered to each other. The conductors of the U-elbow are connected to the screen of the curved ring on both sides, the central wire of the television cable - on one side.

The result is a passive UHF antenna. For outdoor use, coat the cable with a compound, resin, and enclose the product in a durable, impermeable plastic casing.

Wi-Fi, TV rings

Two aluminum circuits

“Cheburashki” firmly captured oblivion, but it turned out not completely. Many people have seen a flat aluminum plate equipped with huge rings on the sides. How to make a decimeter antenna with your own hands? You will need two flat aluminum rings with an outer diameter of 100 mm and an inner diameter of 38 mm. Each is cut through with a 5 mm wide slot.

It turns out that two circuits will avoid the use of a transformer. The frame will be a fiberglass lath, a piece of durable board. Both rings are attached with a distance between centers of 103 mm towards the slots. The upper and lower edges of the slits are connected in pairs. The screen and the core of the coaxial cable going to the TV are connected to the resulting pairs.

The antenna decorates the balcony, room, roof. The length of the coaxial cable to the TV is shorter, the reception is more reliable.

The circuit is formed by circular vibrators. With horizontal polarization of the wave, there is no phase difference between the symmetrical rings located one above the other, the cable removes the received radiation from the isthmus.

The resonant frequency of the product is 802 MHz, allowing the use Wi-Fi networks 900 MHz, viewing television channels 38 - 64. The UHF antenna fits perfectly with the RK-75 coaxial cable, demonstrating a gain of 15 dB.

The structure is positioned vertically, the slots should be one above the other, respectively, the polarization of the received signal is horizontal.

Two getinax circuits

Radio amateurs may find another method of manufacturing the described design attractive: the required shapes are cut out on the getinax board, textolite with one-sided foil. Between the rings, according to the described scheme, it is necessary to leave a contact bridge with an external width of 20 mm and a 5 mm slot inside. Two mirrored holes are drilled for the coaxial cable.

The method is convenient: four fastening grooves cut into the getinax by the edge of the sheet will allow you to firmly secure the product. Use:

wall;
frame;
roof.

The design can be easily transposed to high, low frequencies by changing the geometric dimensions of the circles. It is easier to select the optimal input impedance empirically (by trying practical dimensions).

Sealing is carried out with plexiglass plates equal in size to getinaks. The perimeter of the gap is sealed with liquid nails.

An interesting feature of the antenna type is the possibility of creating a phased array. Two identical structures are mounted vertically above each other, separated by a verified distance (the described example is 406 mm between the centers of the eights). To create a single grid, a summing device is used, formed by two branches 325 mm long, fastened in the middle. The coaxial cable is soldered to the connection point.

One circuit with transformer

Now that it is clear how to make a decimeter antenna, consider the transformer mentioned above, which carries out galvanic isolation antenna and TV circuits. The basis is the design described above. There is only one circuit, both ends are closed to the primary winding of a miniature transformer, and the coaxial cable of the TV is soldered to the secondary winding.

The core, formed by several turns of wire, plays the role of a matching device. To manufacture a hinged element, it is necessary to take a ring core with an outer diameter of less than 10 mm and a thickness of 2-3 mm. With a wire with a diameter of 0.2 - 0.25 mm, two windings are wound side by side, each with several turns.

The design is not inferior in efficiency to the dual-circuit models described above. Polarization - horizontal (the slot should be positioned vertically).

Digital television

UHF antennas for digital television are relatively simple to manufacture. You will need a wooden square with a diagonal of 200 mm, or a similar object made of plexiglass, and a large piece of ordinary RK-75 cable.

The option under consideration is part of a zigzag antenna, it perfectly serves the reception range digital channels, regardless of the presence of direct visibility to the tower. To improve performance, you should purchase an amplifier.

The tip of the wire is stripped to 20 mm. Then a square with a diagonal of 175 mm is bent from the cable. The end is bent outward by 45 degrees, the beginning is bent, stripping an area of 20 mm, and tightly wound to the end. Reliable contact between the screens is ensured. The end of the vein hangs in the air.

At the corner opposite to the beginning they cut off protective layer, the screen on an area of 20 mm will be the top of the antenna. The cable square is symmetrically fixed around the perimeter of the wooden sheet. In the area where the screens meet - where the beginning and end are wound to each other - thick copper wire staples are used for fastening to improve electrical contact.

This is how you make a UHF antenna with your own hands. For outdoor use, it must be protected by a plastic case against the influence of the external environment, or securely hidden by the opening of the attic window. The signal rarely passes through metal, tiles, slate. If the roof is made of PVC, plastic, fabric, or similar materials, it is permissible to place the product in the attic.

To block the multipath effect, a reflector shaped like a piece of wood is used. It is secured with ebonite struts coaxially with the antenna.

The designs considered are designed to receive waves with linear polarization. The use of helical antennas may be necessary.

Digital technologies are already sweeping the country, and many are trying to buy TVs that support this format. But if this is not possible, there is another way out - making the antenna yourself. With a little theoretical and practical training, almost anyone can do this.

How to make it yourself dvb - antenna

Digital technologies involve the transmission of images and sound through digital video encodings. It differs from analog equipment in that interference practically does not interfere with the signal, so it arrives at the receiver device with minimal losses.

Today there are already 20 channels of this type. To be able to connect to it, it is not necessary to have special equipment. IN in this case we're talking about about signal reception High Quality, for which it will be enough to have a television cable. It is also called coaxial.

To receive a digital signal you need a decimeter antenna. It’s very easy to do it yourself – you only need an antenna cable. But the main thing is not to make mistakes in the calculations. The procedure is as follows:

Take a 30 cm antenna cable and connectors (male/female and F-connector).
Prepare wire cutters, a tape measure (at worst, a ruler), a knife and a calculator.
Next you will need a computer with an Internet connection. On the digital television website, find a coverage map of dvb channels, determine which one is closest to your city. There is a search form there.
Find a station, find out the detailed frequencies on which it operates.
Several channels and frequencies for them may be indicated there. The antenna length is calculated by dividing 7500 by the frequency. For example, if the channel frequency is 754 MHz, the result is 7500:754=9.94. Thus, it turns out that homemade dvb antenna should be about 10 cm long. If there are several stations, the average length is determined.
You need to attach the F-connector to the end of the antenna wire yourself. It's easy - the cable is stripped and the connector is screwed on top. It is necessary that there is a central wire in the middle, and the foil with the wires is at the attachment point.
Then move a few centimeters away from the connector, then measure another 10 and cut off what is unnecessary.
The plastic insulation and “screen” (wires with foil) are removed from the remaining cable, and the antenna is ready. Now the question is connecting it.

There is another manufacturing method, which is also simple and requires a minimum of available materials: a board approximately 550x70 mm, self-tapping screws, copper wire (40 cm in length, central core 4 mm in diameter). A blank is made from wood. 8 wires, each 375 mm long, stripped in the middle by approximately 30 mm, thus ensuring good conditions to receive the signal. Then you need to cut two wires 220 mm long, and clean the joints according to the size of the board. The remaining wires are bent in a “V” shape.

A special plug connects the antenna and cable (the plug can be purchased separately). The wire is secured to the plug with a tabletop soldering iron. Homemade antenna ready.

The third method will require:

A small cut is made in the cable sheath, 10 cm from the edge, twist the covering “foil”, cutting off the middle layer by 10 mm.

At the opposite end, install a plug to connect to the TV. A cable is attached to one of the cans, the middle of the wire is screwed to the second, and the best method is soldering; tape is unreliable.

Fix the cans in a straight line on the trempel at a distance of approximately 7-8 cm. Now the device needs to be fixed in the place where the television signal is most clearly received. True, such a device will not be able to pick up many channels, maximum 10.

Feature and dvb connections -antennas

The difficulty may be to find a point in the apartment where the digital television signal would be best received.
Then sometimes problems arise with inserting the antenna into the set-top box or TV. Options - for example, first insert an extension cord into the console, and then insert the cable into it. At the same time, it should not disturb anyone; ideally, it is generally better to hide it somehow.

Homemade structures of this kind, apparently, do not take much time. So for about 100-400 rubles you can build a digital television device with your own hands dvb standard. According to reviews, it works even better than various expensive telescopic devices. True, only for digital TV of one frequency. Not suitable for analog. High quality image can be obtained provided that a powerful transmitting station is located no further than 30 km. True, sometimes the distance is reduced even to the range of 5-10 km.

Features of dvb reception

Is there some more homemade methods strengthen the signal, especially if the terrain or great distance from the transmitter (50-100 km) does not allow receiving good welcome digital TV. For high altitude external antenna You will need to install a board, and any two-transistor board with a low or medium gain will do. Powerful amplifiers are not required in this case, since the signal is quite distorted.