Do-it-yourself decimeter antenna for T2. DIY digital antenna for DVB-T2 Powerful antenna diagram for digital TV
Digital television these days continues to spread every day. Providers offer their services in this area by selling expensive devices. However, you can “catch” terrestrial digital television using a homemade antenna.
We invite you to watch a video on making an antenna:
So, we will need:
- decimeter antenna;
- calculator;
- antenna cable;
- cable connector;
- ruler
First of all, it should be noted that to receive digital TV channels you need a TV that supports the DVB-T2 format, otherwise the antenna will not fulfill its purpose. It should also be clarified that providers often advertise so-called digital antennas, which are allegedly created specifically for receiving digital TV channels. This is not true, since you can catch such channels even with a wire. Now that you've sorted out the materials and the introductory part, you can get to work.
Next, we find our district or city on the website to find out the advisory support center or, more simply put, the broadcasting center. The next thing is to call the support center and find out on which channel the digital television is broadcast. The author, for example, broadcasts on channel 27. At the end of this stage, we find out the channel frequency.
Now, using a calculator and a special formula, we have to find out the required length of our antenna. The formula is extremely simple: 7500 must be divided by the number of channel frequencies. The author’s channel frequency is exactly 522000 kHz, that is, you need to divide 7500 by 522. It turns out to be approximately 14.3. We round the result obtained after division and get the length of the antenna in centimeters.
Next, take a regular antenna cable, strip it on one side and insert the connector.
The next thing is to take a ruler and measure the result obtained by dividing, leaving 2 centimeters at the base. That is, if the author needs a cable 14 centimeters long, he measures 2+14 cm.
Cut off the end. After this, we make a cut on the base line and clean it to the edge. We remove the cable protection because we don’t need it. We also cut off the foil.
After this, we bend the cable at the base line at a right angle. The antenna is ready. All that remains is to install it outside so that it faces the transmitting antenna. It is worth noting here that if the distance from the transmitting antenna is more than 15 km, then you will have to use an antenna amplifier.
Antenna is a radio device designed to receive and emit electromagnetic waves through the air.
If you live within direct visibility of a television tower, then a simple homemade indoor television antenna, the design of which is presented in this article, is quite suitable for receiving digital television. This antenna is designed to receive television broadcasts in the digital television frequency range (470–790 MHz).
The design of a television antenna is simple and does not require special knowledge to repeat. To make it you will need 70 cm of copper wire with a diameter of 2-3 mm, a piece of double-sided fiberglass sheet, 1.5 m of coaxial television cable with a characteristic impedance of 75 Ohms and an F-plug.
Instructions for making a UHF television antenna
The first thing you need to do is select a piece of copper wire with a diameter of 2-3 mm and a length of 70 cm. For these purposes, a single-core copper wire is well suited for laying electrical wiring. If there are several conductors in the cable, then you need to carefully cut off one conductor along the groove, being careful not to damage the insulation. It is not needed for the antenna to work; the insulation is left only for aesthetic appearance.
An aluminum wire will also work, but then it will have to be connected to the contacts of the matching transformer board using a threaded connection. Please note that the nut should not touch the shielding foil of the transformer; if it does, then you need to lay an insulating washer or trim the foil.
If you use a wire without insulation, you can put a vinyl chloride tube on it for beauty.
Next, the wire needs to be bent into a ring with a diameter of approximately 220 mm. High precision is not needed here. A paint bucket holder or any other round container of suitable size works well for this.
When the antenna ring is ready, you can begin manufacturing the printed circuit board for the matching transformer.
The printed circuit board is made of fiberglass or getinax, foil-coated on both sides, 1.5 mm thick, 25x30 mm in size. The photo shows the appearance of the transformer printed circuit board on both sides.
This photo shows a negative of the antenna circuit board. The width of the current-carrying tracks is 1 mm, the distance between the tracks is 1.5 mm. Antenna board size 25×30 mm.
If it is not possible to make a printed circuit board for the manufacture of an antenna using a chemical method, then it can be made mechanically. To do this, you need to remove unnecessary sections of the foil, leaving only the contact pads, and lay out the current-carrying paths from copper wire with a diameter of 0.3-0.5 mm, gluing it to the board, for example, with “Moment” glue.
To give an aesthetic appearance and increase the mechanical strength of the antenna, the transformer is placed in a plastic box in which holes for the ring and antenna cable are pre-drilled.
When all the parts are prepared, you can begin assembling the antenna. The ends of the ring, pre-tinned with solder, are inserted into the box and bent at a right angle at a distance of 3 mm. Next, the ends are inserted into the printed circuit board of the antenna transformer and soldered with solder using a soldering iron.
The antenna board is placed on the bottom of the box and secured with an M3 screw and nut.
You first need to install a television F-connector on one end of it, and cut the other one and solder its ends onto a printed circuit board. The center core of the cable is soldered directly to the right end of the ring, and the braided shielding is soldered directly to the foil of the antenna board.
For reliable operation of the antenna, you need to solder or attach the cable in the following order. First, the shielding braid is soldered, then you need to pull the cable well to remove the slack, and only then solder the central core. In this case, when moving the antenna to find a place in the room with the maximum signal level and stretch the cable, the central core will not break.
If the cable screen is made of aluminum foil, then it can be pressed to the foil of the board using a metal clamp placed on a screw and secured with a nut. The technology for attaching the screen with a clamp is discussed in the article “How to make a TV crab with your own hands.”
All that remains is to close the box with a lid, insert the connector into the TV and tune the channels to the desired programs. In order to ensure image quality with minimal noise, you need to move the antenna around the room to find a place with the maximum television signal.
How to replace the matching printed circuit board
cable loop
The use of a printed circuit board to match the antenna with a coaxial cable allows you to make the antenna more compact.
If there is no desire or opportunity to make a printed circuit board, then without losing the quality of the antenna’s performance, it can be replaced with a loop, which is also called a U-elbow, which is a section of television cable bent in half, connected to the antenna according to the diagram, as in the photograph below.
To make a matching loop, you need to take a piece of television cable 162 mm long, with which the antenna will be connected to the TV. Cut its ends and solder the central cores to the ends of the ring, the distance between which should be 60 mm. Next, the end of the cable going to the TV is cut and its central core is soldered to either end of the antenna ring, and the shielding wire is connected to the shielding wires of the loop, as shown in the photograph.
When soldering the shielding braid, care must be taken so that the insulation of the central core does not melt and the braid does not come into contact with it.
The photo shows the soldering of a cable to an antenna ring made of aluminum wire with a diameter of 3 mm. Since it is difficult to solder wires to aluminum with soft solder, the ends of the ring were slightly flattened, holes were drilled in them, and brass petals were secured with rivets. The central cores of the cable are soldered securely to the petals.
Today we are sharing life hacks on how to make a TV antenna with your own hands. An antenna is a device for emitting or receiving radio waves. There are transmitters, receivers and transceivers. The editors learned that a simple design can be made using copper and brass wire, copper tubes, wires, and even tin cans.
TV antenna made from tin cans
You can make an antenna for a TV yourself, from scrap materials, even from empty beer cans. This method is the fastest and easiest. You can make a structure from electrodes and disks. The maximum number of channels will be seven.
You will need:
- can;
- plug;
- antenna cable;
- screwdriver;
- adhesive tape or insulating tape;
- wooden trempel;
- self-tapping screws (2 pcs).
The indoor design guarantees reliable reception of an analog signal within the city and without cable coordination (with a length of up to 2 m).
Distance between banks:
where λ is the wavelength. There should be no more than 3-4 dipoles. If there are fewer of them, the gain will be insignificant; if there are more, there will be problems with cable matching.
The signal quality will noticeably improve if you place a metal mesh screen on the back.
Distance between screen and main structure:
How to make a design:
How to improve the antenna?
An amplifier is needed if the broadcaster is located far away. With an amplifier, the design receives the signal more reliably, but the “do it yourself” option may not work here.
You can use a magnet onto which several turns of television cable will be wound (collected both near the TV and on the antenna).
If the question is how to strengthen the signal of a home structure so that instead of 7, 20 channels are clearly broadcast, you need to:
- buy a special TV signal pre-amplifier;
- find the location of ideal signal reception;
- get rid of interference caused by metal objects.
How to quickly make an antenna:
How to assemble an antenna for digital TV?
A homemade design should be:
- carefully manufactured with a high degree of precision without loss of signal power;
- strictly directed along the axis of the electromagnetic wave emanating from the transmitting center;
- targeted by type of polarization;
- have protection from side interference signals of the same frequency emanating from any sources: electric motors, radio transmitters, generators.
How to make your own antenna for digital TV (DVB T2):
Simple digital TV antenna: what are your options?
It will require a piece of coaxial cable with a characteristic impedance of 75 Ohms and a plug to connect the structure.
The algorithm is like this:
- use a regular knife to cut off the outer shell from the free end;
- take the length with a small margin, since it is easier to bite off a small piece during setup than to run for a new cable;
- the shielding layer is removed from this section of the cable, the inner core is exposed and the insulation is removed;
- insert the plug socket into the connector on the TV signal set-top box, direct the exposed wire of the inner core across the incoming electromagnetic wave;
- remember horizontal polarization;
- the on-air digital antenna should be fixed on the windowsill or with a piece of tape on the glass;
- interference and reflected signals are shielded by a strip of foil located at a short distance from the central core;
Types of antennas and which ones can you make yourself?
There are “Polish”, “eight” and “square”. Digital antennas for the TV tuner and set-top box must be set to the same frequency.
IMPORTANT! Both the set-top box and the tuner must be able to decode the signal.
"Polish" antenna and digital TV
It provides high-quality and reliable reception of analog television (+ UHF), but is completely unsuitable for receiving modern digital TV.
"Eight": manufacturing algorithm
A simple design for DVB T2, which can be made from Ø 3 mm copper wire. The reflector is not used in this case. The upper side of the segments is 14 cm, the side is 13 cm.
We measure the wire 112 cm long and begin to bend:
- We bend the 1st segment to a length of 14 cm (for the antenna - 13 cm and 1 cm - for the strength of the loop);
- 2nd and 3rd, like 6 and 7 – 14 cm;
- 4th and 5th – 13 cm;
- 8th – 14 cm – 13 cm and 1 cm – with a strength loop.
We clean the loops, tighten them and solder them - they will become contacts for connecting the cable. For soldering, we strip the cable from the antenna side by 2 cm and 1 cm from the plug side, the joints are sealed with any elastic hot-melt adhesive.
What is a “square” and is it worth taking on it yourself?
A modification of the “three square” design with 6 elements and a transformer confidently receives digital and analogue channels at a distance of up to 10 km of line of sight.
- Double square
Behind the main frame is a reflector, the side of the main frame is 0.254λ, the side of the reflector is 0.278λ, the distance between the frames is 0.089λ.
Another option for a double square is two rings.
Butterfly antenna
A short-wave, small-sized antenna, shaped like a butterfly. To make it, you need copper wire with a diameter of about 2 mm; for external use, 4 mm is allowed; for home use, a regular 75 Ohm TV coaxial cable.
Rectangular wire frame (length and width):
- for TV - 500x200 mm;
- for Wi-fi (omnidirectional) and Bluetooth - 90x30 mm.
We twist the frame crosswise and cut it with wire cutters so that two triangles are formed. We solder the coaxial cable and secure it with staples (adhesive tape) to an ebonite, wood or plastic dielectric.
Powerful TV Antenna: What should I know about it?
In order for the device to function like a regular antenna, its receiving circuit must be improved.
Algorithm:
- we buy equipment to strengthen the signal;
- connect to the device to eliminate signal interference;
- wrap the cable at both ends with insulating tape;
- we make a screen for high-quality reception: a kind of metal mesh, which is isolated from the TV and fixed behind the receiver;
- for the screen, an ordinary metal mesh from an ordinary fence will do;
- add iron rods and connect them symmetrically to the screen to amplify the signal (it is necessary that the entire structure be made of the same type of metal to avoid oxidation) $
- We place another amplifier in the center of the installation and solder the contacts to the receiver.
IMPORTANT! This television structure is installed on the roof with a focus on the nearest television tower.
Universal design
Required tools and materials:
- copper wire (length 4 m, cross section 4 mm2);
- board of any thickness, but 7 cm wide and 55 cm long;
- soldering iron;
- wood screws;
- tape measure or ruler;
- screwdriver;
- simple pencil.
Algorithm:
- cut the copper wire into 8 parts, each length 37.5 cm;
- remove the insulating layer in the middle part of each of the resulting parts of the wire;
- cut off 2 more copper wires (22 cm each) and divide them roughly into 3 equal parts;
- at the points of inflection, remove the insulating layer;
- bend the wire in prepared (bare) places;
- the distance between the ends of the wire bent in half is 7.5 cm;
- secure the plug, connect the television cable.
How to make an antenna for digital TV (DVB T2) yourself:
Log-periodic (all-wave) design
This is a collecting line with halves of dipoles installed on it alternately. The length of the piece of wire forming the half-dipole will be equal to λ/4.
IMPORTANT! Do-it-yourself outdoor structures can provide a gain of up to 25 dB, and about 12 dB for indoor ones.
LPA is an ideal device for receiving both analogue and digital signals. To calculate the parameters, it is necessary to know the value of the progression index (from 0.7 to 0.9) and the opening angle α (30-60°). We take the proportion as a basis and calculate the necessary parameters:
τ=B2/B1=B3/B2=Bn/(B(n-1)) = A2/A1=A3/A2=An/(A(n-1))
The higher τ, the better the gain indicator. Reducing the angle α can increase directivity.
Calculation of parameters:
- determine the values of B2 and A2;
- calculate B1 and A1 and other parameters.
What types of antennas are there? Home simple homemade antenna
The home structure is mounted from copper or brass wire. Aluminum is not suitable because it oxidizes quickly.
The wire is cleared of insulating material at both ends, one end is attached to a pipe or battery, and the opposite end is inserted into a television connector. The amplifier of the required frequencies is a pipe that runs through the entire house and goes upstairs. A signal appears immediately, the antenna picks up 5 channels.
- For an apartment with a balcony
A longer wire is taken, since the TV and the balcony area will need to be connected. The wire is stripped on both sides, one end is connected to the TV in a cable socket, and the other is pulled out onto the balcony and attached to ropes or strings. Such an antenna gives a cooler image, and there are more channels with it.
Antenna for a summer residence
Passive structures are installed to ensure stable signal reception at a distance of up to 30 km in both winter and summer. For longer distances, more powerful designs are needed, preferably with an amplifier. For hilly terrain and ultra-long-range reception, the antenna must be raised higher using a mast.
For a classic garden design you will need:
- wire (Ø 1.5 mm) - at the rate of 1.5-2 m for the antenna and 5-6 m for the distance from the structure to the TV;
2. the outer part is made of prepared wire (twist 1-1.5 m into a ring, Ø from 356 mm to 450 mm); - the inner part of the antenna (make a second ring from wire, dimensions - 180 mm;
- the finished rings - the basis of the future antenna - are fixed on a piece of plywood (you can also use a piece of wood), but so that the wood does not overlap the rings and does not dangle;
- Orient the finished structure with its rings in the direction of the signal source, and rotate the antenna to search for the best signal.
Antenna Kharchenko (biquadrat)
This is an outdoor zigzag design with a reflector.
Z-antenna system with reflector provides the same parameters as
LP antenna. The difference is in the main lobe - it is twice as long horizontally, which allows you to catch a signal from all directions.
The UHF antenna is made of a copper tube and a 6 mm thick aluminum sheet.
Car antenna: internal and external
- Internal
You will need a frame device, which is placed at the back under the glass seal. It is narrowed at the top, but the dimensions are not what is required at a frequency of 27 MHz. For this reason, a capacitor is installed in the center, with the help of which the TV antenna for a car is tuned to resonance on the required channel.
IMPORTANT! There are several receiving frequencies - 27 and 65 MHz, 28.2 and 68 MHz.
Manufacturing algorithm:
- we take wire MGTF 0.5, which is laid along the edges of the rear window in the form of a trapezoid;
- do the same with the upper part;
- the poles are positioned so that it is easy to add wires for the matching capacitor;
- to pick up the signal, use cable RK-50;
- 5-25 PF are fixed in the center of the rear window, to which both cables are directed strictly vertically.
Universal compact TV antenna for a car:
- External
For a good signal, you need to attach a pair of telescopic antennas from the radio. The case can be taken from a Polish device.
Figure 11 - Polish design - the basis for an internal auto antenna Power supply to amplifier:
- take the connector for the active TV antenna and solder the wire to it;
- We pass the cable from the TV antenna so as not to pinch it;
- screw it to the connector;
- the wire soldered to the connector is connected to output +12 on the radio to turn on the amplifier or active antenna.
There are active interior combined TV antennas with external elements for receiving MF/UHF.
In addition to the above, there are meter (crossed aluminum tubes) and fractal antennas.
DIY fractal Wi-Fi antenna:
IMPORTANT! All stories about the effective operation of a mercury antenna are a big misconception. Science does not know a single principle by which a mercury antenna could work. The editors warn that making a mercury antenna yourself is a so-so idea and a dangerous undertaking.
What is digital TV multiplex?
A digital multiplex is a set of channels of the same frequency. There are two multiplexes: the first is available in all cities with digital TV, but not all towers are ready for the second. For installation you will need a receiver and antenna supporting DVB T2.
Today, stores are flooded with all kinds of television antennas, so purchasing the right antenna is not difficult. But it happens that it is not possible to buy an antenna, for example, in the country. It is to help in such a situation that we will tell you how to make a TV antenna with your own hands.
Beer can antenna
It is the most popular homemade antenna. It is popular because it is easy to make and the materials for it are readily available. Such an antenna can be made in 10 minutes, and works even better than a stationary one.
To make such an antenna you will have to use:
- cable;
- a couple of tin cans;
- two self-tapping screws;
- plug;
- insulating or adhesive tape;
- screwdriver;
- with a stick.
Manufacturing process:
First, we fasten the cans and the stick together with insulating tape. One can should be tied at a distance of approximately 7 cm from the other. If the cans have rings, then the cable is fastened to them.
Now we screw it into the cans with self-tapping screws, strip the ends in the antenna cable and attach it to the screws.
We fasten the cable and the stick with tape, this is necessary for the receiver to be stable.
An alternative to a wooden stick is a hanger.
To protect the antenna from losing its working properties under the influence of atmospheric factors, the jars should be covered with a two- to three-liter plastic bottle with the bottom and neck cut off. A hole should be made in the center of the bottle through which the cable must be pulled. When the connection is completed, the area is doused with boiling water. High temperature will cause the plastic to change shape and ensure the hole is sealed.
Antenna for TV with normal signal reception
If you don’t think that you are a great craftsman, but still want to make an antenna for your TV yourself, then try the following:
Assemble one of the options shown in the pictures (they are almost identical in power, they differ only in design).
- Installation of this circuit is carried out on a plastic or wooden base, and the circuit itself is installed on a TV or balcony.
- The connection between the TV and the antenna is made with a plug and cable, on which the insulation is cut off to a length of approximately 5 cm.
- The opened winding must be divided in two and bent back.
- The inner winding is also cut to the same length and the wire core is exposed.
- The core and winding are attached to the plug with screws. If your plug is not equipped with a place for fastening the winding, the winding is cut off.
- The other edge of the cable is attached to the circuit. First, the end of the cable must be stripped and twisted into a ring.
- The connections are wrapped with insulating tape to ensure reliability.
- To improve the signal from such an antenna, you can use electronic amplifiers.
High Power TV Antenna
How to make an antenna for a TV with your own hands, so that it is not inferior in parameters to purchased options, and even surpasses them?
The answer is simple - you need to improve the receiving circuit.
To begin with, you should connect the signal amplifier to the antenna and carefully insulate the cable so that interference does not penetrate the signal.
For high-quality reception, you will need to make a screen - isolated from the TV and installed behind the receiver. Ordinary food foil, which is used in the kitchen, can be used as a screen.
There is no point in installing such an antenna at home; most often it is installed on the roof and turns to where the nearest TV tower is located.
Economical antenna made from a minimum of material
You need to take the simplest wire, but not aluminum, since aluminum oxidizes quickly. The ideal option is copper or brass wire. The wire should be stripped of insulation on both sides, after which one end of the wire is inserted into the TV, and the other is attached to a battery or pipe. You will see that the antenna will pick up the signal, since the pipe passes through the house to the roof, and plays the role of an amplifier of the required frequency. With this method it is possible to catch about five channels.
To implement the second option, the apartment must have a balcony. Here you will need a wire of the same length, or even longer, to connect the TV and the balcony area. The wire is stripped on both sides, and one end is inserted into the TV, and the other is attached to stretched laundry strings. Thanks to this method, not only will channels be added, but the image will also become much higher quality.
Homemade antenna for T2 video
Now you know how to make an antenna for a TV with your own hands, all that remains is to attach it and point it at the signal emitter.
In summer cottages, a television signal can rarely be received without amplification: it is too far from the repeater, the terrain is usually non-uniform, and trees get in the way. For normal “picture” quality, antennas are needed. Anyone who knows at least a little how to handle a soldering iron can make an antenna for their dacha with their own hands. Outside the city, aesthetics are not given so much importance; the main thing is quality of reception, simple design, low cost and reliability. You can experiment and do it yourself.
Simple TV antenna
If the repeater is located within 30 km from your dacha, you can make the simplest receiving part in design. These are two identical tubes connected to each other by a cable. The cable output is fed to the corresponding TV input.
The design of an antenna for a TV in the country: it’s very easy to do it yourself (to enlarge the size of the picture, click on it with the left mouse button)
What is needed to make this TV antenna?
First of all, you need to find out what frequency the nearest TV tower is broadcasting on. The length of the “whiskers” depends on the frequency. The broadcast band is in the range of 50-230 MHz. It is divided into 12 channels. Each requires its own length of tubes. A list of terrestrial television channels, their frequencies and parameters of a television antenna for self-production is given in the table.
| Channel number | Channel frequency | Vibrator length - from one end to the other end of the tubes, cm | Cable length for matching device, L1/L2 cm |
|---|---|---|---|
| 1 | 50 MHz | 271-276 cm | 286 cm / 95 cm |
| 2 | 59.25 MHz | 229-234 cm | 242 cm / 80 cm |
| 3 | 77.25 MHz | 177-179 cm | 187 cm / 62 cm |
| 4 | 85.25 MHz | 162-163 cm | 170 cm / 57 cm |
| 5 | 93.25 MHz | 147-150 cm | 166 cm / 52 cm |
| 6 | 175.25 MHz | 85 cm | 84 cm / 28 cm |
| 7 | 183.25 MHz | 80 cm | 80 cm / 27 cm |
| 8 | 191.25 MHz | 77 cm | 77 cm / 26 cm |
| 9 | 199.25 MHz | 75 cm | 74 cm / 25 cm |
| 10 | 207.25 MHz | 71 cm | 71 cm / 24 cm |
| 11 | 215.25 MHz | 69 cm | 68 cm / 23 cm |
| 12 | 223.25 MHz | 66 cm | 66 cm / 22 cm |
So, in order to make a TV antenna with your own hands, you need the following materials:
It would be nice to have a soldering iron, flux for soldering copper and solder on hand: it is advisable to solder all connections of the central conductors: the image quality will be better and the antenna will work longer. The soldering areas then need to be protected from oxidation: it is best to fill it with a layer of silicone, or you can use epoxy resin, etc. As a last resort, seal it with electrical tape, but this is very unreliable.
Even a child can make this homemade antenna for a TV, even at home. You need to cut the tube to the length that corresponds to the broadcast frequency of a nearby repeater, then saw it exactly in half.
Assembly order
The resulting tubes are flattened on one side. With these ends they are attached to a holder - a piece of getinax or textolite 4-6 mm thick (see picture). The tubes are placed at a distance of 6-7 cm from each other, their far ends should be at the distance indicated in the table. They are secured to the holder with clamps; they must hold firmly.
The installed vibrator is fixed to the mast. Now you need to connect the two “whiskers” through a matching device. This is a cable loop with a resistance of 75 Ohms (type RK-1, 3, 4). Its parameters are indicated in the far right column of the table, and how it is done is on the right side of the photo.
The middle cores of the cable are screwed (soldered) to the flattened ends of the tubes, and their braid is connected with a piece of the same conductor. Getting the wire is simple: cut a piece from the cable slightly larger than the required size and remove all the sheaths. Clean the ends and screw them to the cable conductors (it’s better to solder them).
Then the central conductors from two pieces of the matching loop and the cable that goes to the TV are connected. Their braid is also connected with copper wire.
Last step: the loop in the middle is attached to the rod, and the cable going down is screwed to it. The barbell is raised to the required height and “adjusted” there. To set up, you need two people: one turns the antenna, the second watches TV and evaluates the picture quality. Having determined where the signal is best received from, the home-made antenna is fixed in this position. To avoid having to struggle with “tuning” for a long time, take a look at where your neighbors’ receivers (over-the-air antennas) are pointing. The simplest antenna for a summer residence is made with your own hands. Set and “catch” the direction by turning it along its axis.
Watch the video on how to cut a coaxial cable.
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Loop from a pipe
This do-it-yourself antenna for a summer residence is a little more difficult to manufacture: you need a pipe bender, but the reception radius is larger - up to 40 km. The starting materials are almost the same: metal tube, cable and rod.
The bend radius of the pipe is not important. It is necessary that the pipe has the required length, and the distance between the ends is 65-70 mm. Both “wings” should be the same length, and the ends should be symmetrical about the center.
Homemade antenna for a TV: a TV signal receiver with a reception radius of up to 40 km is made from a piece of pipe and cable (to increase the size of the picture, click on it with the left mouse button)
The length of the pipe and cable is indicated in the table. Find out what frequency the repeater closest to you is broadcasting on, select the appropriate line. Saw off a pipe of the required size (diameter is preferably 12-18 mm, the parameters of the matching loop are given for them).
| Channel number | Channel frequency | Vibrator length - from one end to the other, cm | Cable length for matching device, cm |
|---|---|---|---|
| 1 | 50 MHz | 276 cm | 190 cm |
| 2 | 59.25 MHz | 234 cm | 160 cm |
| 3 | 77.25 MHz | 178 cm | 125 cm |
| 4 | 85.25 MHz | 163 cm | 113 cm |
| 5 | 93.25 MHz | 151 cm | 104 cm |
| 6 | 175.25 MHz | 81 cm | 56 cm |
| 7 | 183.25 MHz | 77 cm | 53 cm |
| 8 | 191.25 MHz | 74 cm | 51 cm |
| 9 | 199.25 MHz | 71 cm | 49 cm |
| 10 | 207.25 MHz | 69 cm | 47 cm |
| 11 | 215.25 MHz | 66 cm | 45 cm |
| 12 | 223.25 MHz | 66 cm | 44 cm |
Assembly
The tube of the required length is bent, making it absolutely symmetrical relative to the center. One edge is flattened and welded/sealed. Fill with sand and seal the other side. If there is no welding, you can plug the ends, just attach the plugs to good glue or silicone.
The resulting vibrator is mounted on a mast (rod). The central conductors of the matching loop and the cable that goes to the TV are screwed to the ends of the pipe, and then soldered. The next step is to connect a piece of copper wire without insulation to the braided cables. The assembly is completed - you can start “setting up”.
Beer can antenna
Even though it doesn't look serious, the image becomes much better. Tested many times. Try it!
Outdoor antenna made from beer cans
We collect it like this:
- We drill a hole (5-6 mm in diameter) in the bottom of the jar strictly in the center.
- We pull the cable through this hole and take it out through the hole in the cover.
- We fix this can on the left on the holder so that the cable is directed to the middle.
- We pull the cable out of the can by about 5-6 cm, remove the insulation by about 3 cm, and disassemble the braid.
- We trim the braid, its length should be about 1.5 cm.
- We distribute it over the surface of the can and solder it.
- The central conductor sticking out 3 cm needs to be soldered to the bottom of the second can.
- The distance between the two banks must be made as small as possible and fixed in some way. One option is duct tape or duct tape.
- That's it, the homemade UHF antenna is ready.
Terminate the second end of the cable with a suitable plug and plug it into the required socket on the TV. This design, by the way, can be used to receive digital television. If your TV supports this signal format (DVB T2) or has a special set-top box for your old TV, you can receive a signal from the nearest repeater. You just need to find out where it is and point your television antenna there, made with your own hands from tin cans.
Simple homemade antennas can be made from tin cans (beer or beverage cans). Despite the frivolity of the “components,” it works very well and is very easy to manufacture
The same design can be adapted to receive VHF channels. Instead of 0.5 liter jars, use 1 liter jars. Will receive MV band.
Another option: if you don’t have a soldering iron, or you don’t know how to solder, you can do it easier. Tie two cans at a distance of several centimeters to the holder. Strip the end of the cable by 4-5 centimeters (carefully remove the insulation). You separate the braid, twist it into a bundle, and make a ring out of it, into which you insert a self-tapping screw. Make a second ring from the central conductor and thread a second screw through it. Now at the bottom of one can you clean out (with sandpaper) a spot to which you screw the screws.
In fact, for better contact, soldering is needed: it is better to tin and solder the braid ring, as well as the point of contact with the metal of the can. But it also works well with self-tapping screws, however, the contact periodically oxidizes and needs to be cleaned. When it starts snowing you will know why...
DIY digital TV antenna
The antenna design is frame. For this version of the receiving device you will need a cross made of wooden boards and a television cable. You will also need electrical tape and a few nails. All.
We have already said that to receive a digital signal you only need a decimeter terrestrial antenna and a corresponding decoder. It can be built into televisions (new generation) or made as a separate device. If the TV has the function of receiving a signal in the DVB T2 code, connect the antenna output directly to the TV. If your TV does not have a decoder, you will need to purchase a digital set-top box and connect the antenna output to it, and connect it to the TV.
How to decide on a channel and calculate the perimeter of the frames
Russia has adopted a program according to which towers are constantly being built. By the end of 2015, the entire territory should be covered by repeaters. On the official website http://xn--p1aadc.xn--p1ai/when/ find the tower closest to you. The broadcast frequency and channel number are indicated there. The perimeter of the antenna frame depends on the channel number.
For example, channel 37 broadcasts at a frequency of 602 MHz. The wavelength is calculated as follows: 300 / 602 = 50 cm. This will be the perimeter of the frame. Let's calculate the other channel in the same way. Let it be channel 22. Frequency 482 MHz, wavelength 300 / 482 = 62 cm.
Since this antenna consists of two frames, the length of the conductor should be equal to twice the wavelength, plus 5 cm for the connection:
- for channel 37 we take 105 cm of copper wire (50 cm * 2 + 5 cm = 105 cm);
- for channel 22 you need 129 cm (62 cm * 2 + 5 cm = 129 cm).
Assembly
It is best to use copper wire from the cable that will then go to the receiver. That is, you take the cable and remove the sheath and braid from it, freeing the central conductor of the required length. Be careful not to damage it.
- for channel 37: 50 cm / 4 = 12.5 cm;
- for channel 22: 62 cm / 4 = 15.5 cm.
The distance from one nail to another must correspond to these parameters. Laying copper wire begins on the right, from the middle, moving down and further to all points. Only in the place where the frames come close to each other, do not short-circuit the conductors. They should be at some distance (2-4 cm).
When the entire perimeter is laid, the braid from a cable several centimeters long is twisted into a bundle and soldered (wound if soldering is not possible) to the opposite edge of the frame. Next, the cable is laid as shown in the figure, wrapping it with electrical tape (more often, but the laying route cannot be changed). The cable then goes to the decoder (separate or built-in). The do-it-yourself antenna for receiving digital television is ready.
How to make an antenna for digital television with your own hands - another design - is shown in the video.
