As it turned out, the assembled TV antenna with its own hands perfectly catches the signal from the nearest television tower. over, you can design and assemble many effective functioning devices for home use. In this article, we present a selection of the best models with detailed instructions for their manufacture. And for starters, we’ll analyze their advantages over purchased ones.
What makes homemade antennas good?
Even with the advent of computer technology and the Internet, the popularity of television has not declined. A large number of different programs and channels satisfy the needs of both kids and adult family members.
But sometimes TV people are faced with circumstances in which they need to quickly and competently make their own antenna.
Here are just a few reasons to engage in technical "amateur":
And some home inventors are abandoning purchased devices for new experiments. Such a hobby often helps out and also saves the family budget.
Skeptics may object and say that a do-it-yourself television antenna does not compare in quality with branded devices.
However, practice has shown that with a favorable position of the building and correctly performed calculations, the signal is caught remarkably, and the homemade product does its job perfectly.
It should be understood that the transmission of a digital signal is limited by both distance and visibility. It is believed that the transmitter can provide a good signal at a distance of 60 km, although in practice there have been cases where 90 km were not an obstacle, especially when using an amplifier.
Under such conditions, even a weak signal will be sufficient for the image and sound to satisfy consumer needs.
However, the following requirements apply to antennas:
- location. along the axis of the incoming electromagnetic wave;
- all work is carried out carefully, in accordance with the calculations;
- do not forget about polarization orientation;
- if there is interference matching in frequency, additional protection is needed.
For signal reception to be high-quality, it must be 1.5 dB higher than background noise accompanying interference. If cable damage or phase distortion occurs, even a strong signal will disappear.
Model # 1. a simple device from beer cans
This is the simplest modification of a home antenna that does not require special knowledge or calculations. Of course, the device cannot be called powerful, but under favorable conditions it is able to catch several channels.
To make it, you will need two beer cans, a meter-long piece of a television cable with a connector, a construction or office knife for cutting the cable, electrical tape, a small wooden block.
To learn how to make a simple TV antenna at home, just use the photo instruction below. The device is very popular, so the manual is detailed and accessible to everyone.
Step-by-step instructions for manufacturing a "can" device:
The antenna is completely ready, it remains to connect it to the TV.
For those who are doing this for the first time, here is another short photo guide:
This is a primitive version of the antenna, it is not worth hoping for an excellent image or a large number of captured channels.
But with a favorable location of the house relative to the broadcast source, you can find from 5 to 8 different channels that will be displayed in satisfactory condition.
To improve the quality of signal transmission, you can try to change the position of the antenna or slightly increase the length of the wire to bring it to the balcony.
Model # 2. Digital Broadcast Biquadrat Antenna
Video: How to Make a Homemade Antenna For a TV
The biquadratic antenna, so beloved by self-taught masters, was invented by engineer Harchenko in the last century, whose name it is still called.
To increase the directivity, a double square is equipped with a lattice or screen, but with good wave conductivity it is not required. We offer two similar options that differ in material and manufacturing nuances.
Option # 1. Copper Wire
To receive an analog or digital signal, a simple, small, antenna made of copper wire and coaxial cable is suitable. The design of the device is simple: a biquadrat with a central housing from a junction box. It can be installed in an apartment or on the street.
Digital television is now common, so the antenna is designed specifically for it. It is not worth setting random sizes, it is better to make calculations. First you need to find out the range of digital channels, the necessary information can be obtained from the directories on the Internet.
For the “digit” the average value of the frequency is 690 MHz. If you still use analog channels, you will need 470 MHz (for decimeter waves).
Next, you need to calculate the sizes. and here it is easiest to use an online calculator that is designed to calculate antennas of this type. Paste the frequency into the upper window. other parameters are automatically calculated.
For a 690 MHz biquadrat, one side of the square (L1) is approximately 105 mm, and the length of the entire instrument (L2) is 295 mm. These are the basic dimensions you need to know.
Step-by-step instructions for making a homemade copper antenna TV antenna:
After installing the antenna, it is necessary to put the plug on the other end of the cable, if it is not there, and then plug it into the corresponding connector on the TV.
To check the signal quality, turn on auto search. Most likely, the quality of the reception will be good.
Option # 2. from aluminum wire
The second model resembles the first in design and manufacturing method, but it also has distinctive features.
It takes very little time to assemble the structure and connect.
If all the materials are prepared, and the tools are at hand, then one free evening is enough.
The finished antenna, so that it catches the signal better, must be taken out to the balcony or put in the window.
If the nearest TV tower is on the side, then to improve the direction, you can fix the biquadrat on a stick and set forward. The quality of wave reception is not so negatively affected by the distance as the presence of all kinds of obstacles. for example, residential high-rise buildings.
Model # 3. Spiral TV Device
This is a suburban option without an amplifier, assembled from improvised material: the remainder of the power cable and the old snow shovel. The cable is used to make a spiral, and a good reflective screen is obtained from a fragment of a shovel.
A decimeter antenna picks up digital broadcasts if it suits the reception range. In order to calculate the step between the turns, it is necessary to clarify the frequency of transmission of the “numbers” in the region, and translate the resulting value into meters.
Calculations for this model:
- frequency. 522 MHz
- wavelength (λ). 0.57 m
- ⌀ of each turn. 0.177 m
- step between two adjacent turns. 0.137 m
- distance from cable to screen. 0.074 m
- reflective screen width. 0.35 m
Before starting work, it is recommended that all measurements be recorded on a chart that will serve as a guide.
For work, you need a flat part of the snow shovel, which is made of stainless steel. If there are no similar items on the farm, then just a steel sheet. It is not necessary to cut a circle out of it; the workpiece may take the form of a square or rectangle.
A spiral needs a conventional electric wire with a diameter of 0.2 cm, or rather, one of its copper conductors in polymer insulation. In practice, it is better to use a wire whose cross section is 5 times larger. so the reception range will be wider. We need a second cable with a connector. coaxial, with a resistance of 75 ohms.
- To build a base for winding cable from a sheet of plywood and wooden battens. Ideally, there should be a dielectric cylinder instead.
- Straighten the steel sheet, fix it perpendicular to the base using a fixed screw mount.
- To wind the cable with turns according to the calculations.
- Connect the coaxial cable with twisted cable.
For testing, the product must be moved to the upper part of the house and installed in the attic or in the attic. where the antenna will be protected from rain. But this is provided that the roof is covered with a material through which waves freely penetrate. for example, soft tiles.
In addition to this model, for the summer cottage you can build other, no less simple and effective, variants of antennas from improvised materials. In another article on our website, we presented a selection of the best suburban models with detailed instructions for their manufacture.
A few recommendations for the use and operation of spiral homemade: