In detail: do-it-yourself TV antenna repair from a real master for the site my.housecope.com.
Despite the huge number of television antennas on the consumer market, which can be easily purchased at any electronics store, interest in how to make an antenna for a TV with your own hands does not disappear. This interest can be explained by the unwillingness to spend money on buying an antenna, being far from retail outlets (if you are in a remote place or in the country), or the failure of a purchased one.
Antennas for a TV receiver can be divided into several types.
All-wave antenna - the design is simple to manufacture, it can be made from simple materials at hand. It picks up a digital signal quite well outside of the city, where there is not much interference. When located near a broadcasting tower, it can receive analog TV.
Log-periodic band antenna also easy to manufacture. It has perfect consistency with the feeder across all ranges, without changing the parameters in it. Since this design has average technical parameters, it can be used in the country, or as an indoor antenna in the city.
Decimeter antenna... A simplified modification of the Z-antenna is often used, it works well, regardless of the signal reception conditions.
If there are several TVs in your house, then you should learn how to connect 2-3 TV sets to one antenna.
All-wave TV signal catchers are also called frequency independent (FFA). Their designs can be different.
The figure shows an all-wave antenna made of two metal plates a triangular shape and two wooden slats on which a fan-shaped copper wire is stretched.
Video (click to play).
Copper wire can be taken of any diameter, it does not play a special role. The ends of the wire are attached at a distance of 20 to 30 mm between each other. Plates with other ends of the wire welded together should be spaced 10 mm apart.
The metal plate can be replaced with a square piece of fiberglass, which has copper foil on one side.
Since the construction of a homemade antenna is square, its height will be equal to the width, and the angle between the canvases is 90 degrees. Zero potential point marked in yellow in the figure. It is not required to solder the cable sheath in this place - a tight tying will be enough.
A two-petal TV signal receiver assembled in this way is capable of receiving both all decimeter and meter channels. Moreover, he is good at picking up the signal in all directions. But if you install the PN in the area of poor signal reception from the TV tower, it will work normally only with an amplifier. You can use other methods to amplify a bad signal.
A do-it-yourself TV antenna can be made in the shape of a butterfly. To make this fairly powerful antenna yourself, you need to prepare a plate or plywood with dimensions of 550 x 70 x 5 mm, a wire with a copper core with a cross section of 4 mm, and, accordingly, a PK75 cable.
Next, follow these steps.
Mark the holes on the plywood and drill them. Dimensions shown are in inches. Below is a table for converting inches to mm.
From a copper wire, it is necessary to cut 8 pieces of the same length, 37.5 cm each.
In the center of each wire, remove the insulation from the sections (2 cm each), as in the figure.
After that, you should cut off 2 more pieces of wire, already 22 centimeters each, divide them into 3 equal parts and remove the insulation at the separation points.
Give the line segments V-shape... Care should be taken to maintain a distance of 7.5 cm between the ends of the wire. It is this that is optimal in order to receive a clear signal.
Connect all the elements according to the figure below.
Next, you need to purchase a jack to connect a plug to it.
The cable must be soldered to the coil pins as shown.
Make 2 more lengths of wire to connect the antennae to the socket.
Screw the socket onto the board and connect all the elements.
That's all - you made an antenna for the TV with your own hands.
To make such an original PNA, you will need 2 cans (0.5 l or 0.75) of beer or other drink. But before you make a TV antenna, you need to consider some material requirements... Namely, it is recommended to purchase a high-quality television cable with a resistance of 75 ohms per meter. How to choose the right cable? Make sure the center strand is strong and the braid is double and solid.
Do not forget that the longer the cable is, the stronger the signal damping will be, which is especially important for receiving meter waves, in contrast to the UHF, for which the length of the wire also matters, but not so much.
It will also be necessary to prepare a regular wooden trempel, a pair of self-tapping screws, electrical tape or scotch tape and, if possible, a soldering iron with tin.
An antenna from beer cans can receive both decimeter wavelengths and meter.
For clarity of the whole process, you can watch the video.
A log-periodic antenna (LPA) can be used to receive radio waves of both meter and decimeter ranges. For the manufacture of such a signal receiver, you can use an aluminum tube with a diameter of 10 mm and metal rods (pins), which can be bought at a store where fasteners are sold, as a stand. Ideally, smooth tubes or rods are better than threaded rods. A plastic U-shaped box is taken as a basis.
Next, do the following.
The tube must be flattened on one side for attachment to any support. Attach the plastic base to the second side.
Using the diagram below, make rods and drill holes in the box at the required distance from each other.
Then you can assemble the entire structure. Insert the rod into the box and tighten the nut on one side. From the inside, a terminal must be put on the rod (it is made of copper wire, in the form of a ring with a tail for subsequent soldering) and tighten the second nut.
After installing the rods in the box, they must be connected (soldered together). The soldering scheme is shown in the figure. In the figure, the brace (jumper) connecting the last elements is shown in green. On the right, the cable going to the TV is soldered.
When the soldering is completed, the manufacture of the device can be considered complete and you can start testing your creation.
Homemade decimeter signal catchers can be of various shapes and designs, from the simplest to make to the more complex devices.
The simplest design for receiving UHF can be done in a short time with your own hands from scrap materials... All you need is a coaxial cable and an appropriately sized piece of plywood.
Now all this needs to be collected:
prepare a piece of coaxial cable (PK75) 530 mm long (a ring will be made of it);
also cut another piece of cable 175 mm long - this will be a loop;
make a ring (1), solder a loop (2) and a cable (3) that connects to the TV;
fix all this on a plywood sheet and direct the made TV signal receiver towards the TV tower.
If your TV receiver does not pick up a signal using such an antenna, try making a more complex device.
A home antenna for the UHF range with your own hands can be made of wire in the form of a number 8. To make such a receiver, you can use copper or aluminum wire with a diameter of 3 to 5 mm, as well as a cable RK75. During the manufacturing process, you will also need glue gun.
Using the wire cutters, you need to cut off 2 pieces of wire, 56 cm each.
At the ends of each segment, make a loop that should go 1 cm apart.
Bend the wire squares and connect the loops. Solder the cable to the squares as shown in the figure. The central core is soldered to one square, the braid to the other. The distance between the elements should be 2 cm. The whole structure can be fixed in the lid from under a 20 liter water bottle by filling it with glue.
Such a dmv range receiver can be located anywhere, and it does not require an amplifier. Unless, an amplifier may be needed if the device is outdoor, and the cable length will be considerable. In this case, to compensate for signal loss, you will need to install it.
A do-it-yourself TV antenna can be made from an ordinary metal-plastic pipe. This will result in a device for receiving dmv with a possible range from 480 MHz to 1000 MHz. In this “model” a pipe with a diameter of 16 mm and a cable of 5.5 m are used. The ring will require 55 cm of pipe, and for the stand - 14 cm, which is equal to a quarter of the wavelength. This serves to better match the outer sheath of the cable and reduces high-frequency currents.
The cable outlet in this design is made through a hole in the pipe. The cable sheath should be fastened with a clamp to the stripped part of the pipe. The central core of the cable is attached to the ring (a screw, washer and nut can be used). Such a homemade product works well as a room antenna in apartments with reinforced concrete walls that poorly transmit a television wave. Thanks to the extended cable, it can be taken out to the balcony or placed on the windowsill - the reception quality will only improve.
Another design of the dmv antenna is assembled in the form of a frame. It will be made from aluminum plates (stripes).
The first thing you need to do is assemble a frame from aluminum strips. They are fastened with an overlap, using bolts and nuts. It is recommended to paint over the attachment points to prevent corrosion.
The cable should be soldered at points A and B, as shown in the figure.
Next, the square assembled in this way is attached to the mast, on which it is already fixed reflector (reflector). As a reflector, you can use a reflector from an old Polish antenna or use a plaster mesh for this.
For best reception, place the amplifier on the mast and connect the coaxial cable to it (respectively, connect the frame to the amplifier).
Thus, do-it-yourself antennas will help you save money on their purchase, and in some cases get out of the situation when there is a TV, but the standard antenna is out of order, or it does not exist at all. Moreover, the quality of reception of homemade products is not worse than factory counterparts. If you do not want to tinker with the device yourself, then the information on which antenna is better to buy in the store will come in handy.
This version of a homemade television antenna is the simplest and fastest to manufacture. The maximum number of channels that will be at your disposal is 7, but this figure may vary slightly depending on the region.
To make an antenna for a TV from beer cans, you will need the following materials:
2 small screws, also called "bugs";
2 prepared beer cans (empty, washed and dried);
from 3 to 5 meters of television cable (can be taken from a failed device);
soldering iron and tin (for better fixing of contacts), the presence is optional;
screwdriver;
wooden tremp;
electrical tape or tape.
It will not be a problem to find all the materials in the house, therefore, having prepared them, we immediately get down to business.
In order to make a homemade antenna from cans, you need to follow these steps:
As you can see, the whole process is pretty simple and not complicated. The optimal distance is 75 mm between the ends of the cans, and the best installation location is near the window. In individual cases, the distance between the banks can be made more or less.
