To build an antenna, you need a little:
- - Coaxial cable.
- - The socket is television.
- - Copper wire about a meter in length, with a diameter of 2 - 4 mm. Any, even steel, will do the same.
- - Flux with solder.
- - Plastic round junction box for enclosure. Or any other.
Production of an antenna for receiving digital television (DVB-T)
I will make an antenna for receiving digital television channels. To start manufacturing, first you need to calculate the size of the future antenna. And in order to calculate the dimensions, you need to know the middle of the reception range of digital channels. The average frequency is approximately equal - 690 MHz. If you want to make an antenna for analog channels, then take, say - 470 MHz for UHF, etc. (ranges of television channels can be looked )
Next, go here -
Enter the frequency and press "CALCULATE" and look at what is equal to L1. L1 is the square shoulder for the antenna. In my case, for a frequency of 690 MHz, it is approximately 105 mm early. The right number is found, nothing else is needed.
Now we proceed directly to the construction of the bi-square antenna. We measure out about 90 cm of a thick copper wire and bite off with either nippers or pliers.
Next, we straighten the wire with our hands, making it smooth without the waves that formed after winding from the coil.
We measure in a row four segments of 10.5 cm on this wire.
Then bend the double square. The wire is thick and bends with difficulty and this is good - it will not bend from accidental influences.
We bite off the excess wire, leaving an allowance of about a centimeter in order to solder a closed loop.
We clean the connection points and future soldering.
We solder the circuit with solder with flux. Here it is better to use a more powerful soldering iron, since it is difficult to warm up a thick copper wire.
We clean the television cable and solder to the antenna as in the photo.
In principle, the antenna is ready for use. I will not stop there and will make a case for the central part.
Here is what I need.
Since the round box is too deep, I’ll cut off exactly half with a hacksaw.
Then I will melt the grooves under the antenna with a soldering iron. This can be done with the same hacksaw.
I pour adhesive on the connection of wires with the body and the soldering point.
Everything is ready. I will hang the antenna through the window on a nail.
I’ll put the plug for connection on the other end of the cable and plug it into the TV’s connector. To the antenna jack of course.
I’ll run an automatic channel search.
The result was not long in coming. The reception is excellent.
A simple cheap antenna, which is not a pity even if it is stolen. I did this when I lived in a dormitory and then he worked just for a bang.
Another huge plus, I think, is that the antenna can be designed for almost any range, which is incredibly convenient.
