DVB-T2 digital television antenna

Television today is in every home. With the development of technology, the quality of television signals and methods of their transmission change. And if just yesterday antediluvian analogue broadcasting was used, today exclusively digital broadcasting is persistently discussed.
In Russia, television and radio broadcasting is carried out by the state company RTRS. Since 2012, DVB-T2, a multiplex digital broadcasting standard, has been recognized by government decree as a unified standard for digital terrestrial television. The RTRS company, as the only broadcast operator, offers two multiplex packages (RTRS-1 and RTRS-2) for free viewing. All you need is a modern receiver-antenna, one of the options of which today we propose to make with your own hands.
DVB-T2 digital television antenna

This homemade product is based on the development of engineer Kharchenko K.P., who proposed similar antennas for the decimeter range (DCV), popular in the 90s of the last century. This is similar to aperture antennas, based on a zigzag-shaped feed. The signal is accumulated by a flat reflector, which is at least 20% larger in size than the vibrator.
The television signal is transmitted by waves with horizontal polarization. In a simplified form, such an antenna consists of two horizontal loop vibrators connected to each other in parallel, but disconnected at the feeder (cable) connection point. Overall dimensions are given on the basis of Kharchenko’s article “Antenna of the DCV range”, and are calculated according to the proposed formulas. According to this technology, such antennas can be designed even for a weak signal of about 500 MHz.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

What is needed to assemble the antenna


Materials:
  • Barbecue grill;
  • Aerosol paint for cars;
  • Solvent or acetone;
  • A set of drills for a conventional drill;
  • Coaxial television cable – no more than 10 m;
  • Half a meter of HV PVC pipe, diameter – 20 mm;
  • Metal dowels for drywall;
  • Copper wire for the antenna vibrator, core diameter – 2-3.5 mm;
  • Two thin metal plates.

Tools:
  • Soldering iron powerful 100 W;
  • Screwdriver with attachments;
  • Hot glue gun;
  • Pliers, hammer, wire cutters;
  • Painting knife, tape measure, pencil.

DVB-T2 digital television antenna

Let's start making the antenna


Making a vibrator frame


We measure the required length of copper wire with a margin of about 1 cm. You can also use a copper or aluminum tube with a diameter of up to 12 mm.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

We clear the copper core from the insulation and level it with a hammer on a hard surface. Mark the middle and make a 90° bend. The most accurate way to do this is in a vice, lightly pressing the copper core and leveling it with a hammer.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

According to our calculations, the sides of the squares will be 125 mm. We mark them with a tape measure and make bends.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Digital television antenna DVBT2

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Using side cutters, we bite off a small fragment from one end, making the tip pointed at 45°. After bending the second square, we carry out the same procedure, biting off the final end of the core.The squares can be slightly bent for this purpose.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

On the middle bends of the squares we achieve a distance of 10-12 mm. At the ends we make shallow cuts with a needle file. This will help us pull both free ends together and secure them with thin copper wire.
Digital television antenna DVBT2

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Using liquid rosin or flux, we tin the middle bends with a soldering iron. This must be done on all sides of the copper core of the vibrator.
Digital television antenna DVBT2

DVB-T2 digital television antenna

We strip the coaxial cable by 4-5 cm. We twist the braid or outer conductor into a single wire and wrap it around one of the bends. We solder it to the copper core with a soldering iron.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We strip the insulation of the inner conductor and also wrap it around the next bend of the frame. You need to solder it carefully, holding the insulation with pliers, since the temperature can simply move it away from the center. We first heat the frame in the soldering zone, and only then the conductor itself.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We fix the coaxial cable connection with a nylon tie, degrease it with a solvent and isolate the soldering points with hot glue using a gun. You can correct defects in the resulting cast form of glue with a hairdryer.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Preparing the reflector


We use an inexpensive barbecue net as a reflector or reflective screen. This is a good material, since even steel samples of such products are covered with a corrosion-resistant anodized coating, not to mention stainless steel. A heat exchanger from a modern refrigerator or a dish drying rack would also be suitable. The main thing is that this element, if possible, does not rust in the air.
The reflector grid must be larger than the vibrator frame, but does not have to be symmetrical. We cut off the handles from the grille; they will be superfluous in our design.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We place the antenna frame in the middle of the reflector and mark its mounting locations.For fastening, you can use two plates of any metal. We bend them along the grid and drill holes with a diameter of 5 mm.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Assembling the antenna


We cut two pieces of PVC pipe 75 mm long, and screw a self-tapping screw into the end of each, cutting off the protruding parts. We break off the pointed ends of the plasterboard dowels and screw them into the opposite end of the tubes.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We screw both PVC stands to the strips on the reflector with self-tapping screws. We tin the frame at the ends suitable for the racks for better heat transfer.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

On the racks we mark the height of 68 mm, and put it at risk. We heat the ends of the frame with a soldering iron and solder them into the racks to the required marks.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We fill the ends of the stands with hot glue, securely fixing the vibrator frame at their base. We determine the position of the cable relative to the installation of the antenna, and fix it on the frame with nylon ties.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Since oxidation degrades the quality of the received signal, the reflector frame must be protected. This is not at all difficult to do using spray paint.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

Since our screen is lattice, it is very easy to attach the finished antenna to a mast or pipe section using clamps. At the opposite end of the TV cable we mount a standard TV connector F. We close it for insulation with a heat-shrinkable casing and warm it up.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

We screw the TV plug into the connector. We connect the cable to a digital television receiver or directly to a TV with a digital tuner, and enjoy free viewing of TV channels in digital quality.
DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

DVB-T2 digital television antenna

Such an antenna should, if possible, be placed towards the repeater. To enhance signal reception, the vibrator frame is supplemented with several “squares”, and the reflector grid is complicated by horizontal bends.

Watch a video on making a DVB-T2 television antenna


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Comments (9)
  1. Guest Andrey
    #1 Guest Andrey Guests March 23, 2018 07:55
    4
    I did it, it works great.
  2. Guest Sergey
    #2 Guest Sergey Guests March 29, 2018 08:38
    2
    I have the same one, but without a reflector. I attached it to a window with two suction cups, the tower is on the other side of a multi-story building, but the signal reception is excellent.
  3. Guest Andrey
    #3 Guest Andrey Guests 31 March 2018 22:47
    5
    And I also made the same one without a reflector at a dacha in a village in the Ryazan region - it works great, although it only shows 20 channels.
    And at home in the Moscow region, Dzerzhinsky, I plan to make the same thing, only a double eight to receive 40 digital channels and officially get rid of paying for cable television. And this is 1200 rubles. in year.
    Thanks to the author for this detailed calculation with photos and videos.
    I highly recommend using it.
    1. akav
      #4 akav Guests September 6, 2018 10:17
      8
      Do you think that if you make a double figure eight, there will be 2 more channels? :)
    2. Sergey Bykovsky
      #5 Sergey Bykovsky Visitors 17 June 2022 07:32
      3
      Are there 4 multiplexes in the Moscow region? 😁
  4. Alexei
    #6 Alexei Guests 10 April 2018 18:39
    2
    I have a passive all-wave, 28 channels are excellent.
  5. Guest Yuri
    #7 Guest Yuri Guests June 6, 2018 00:13
    2
    I live in a million-plus city, 10 km from the tower. I stuck a straight copper wire \14 cm\ into the antenna socket - 20 digital ones, like from a bush...
  6. Sergey Bykovsky
    #8 Sergey Bykovsky Visitors June 17, 2022 00:47
    3
    Double square Kharchenko, excellent antenna. I use it for numbers without a reflector. I also did it for 4g. On the Internet you can find a Kharchenko antenna calculator to calculate different frequencies.
  7. Guest oleg
    #9 Guest oleg Guests 27 April 2023 20:49
    2
    The insulation does not need to be cleaned. I remember in the late 70s, color TV began to gain momentum. people began to actively buy colored samovars. At the EAS at that time it was possible to catch only a couple of channels in the meter range. Well, we, high school students, having read the magazines “Radio” and “to help the radio amateur,” tried to achieve long-distance communications, tried different antenna options. and were somehow too lazy to remove the insulation from the aluminum power cable. It turned out to be a kind of colored antenna. the neighbors saw this miracle and shouted to the whole village that we were making color antennas for color TV. I had to help them, especially since money for beer at that time was not superfluous. and the cables were lying around in scraps near the substation, and no one handed them over. By the way, back then it was quite possible to assemble a moped or light motorcycle from scrap metal. I'm not even talking about the bike. in general, a liter of beer cost such a color antenna for a color TV