This is a very simple and effective antenna for receiving digital and analogue television. Suitable for use both at home and outdoors. The antenna is a "bi-square" (double square) - this is the simplest and most popular design to replicate.
To build an antenna you will need very little:
- - Coaxial cable.
- - TV connector.
- - Copper wire is about a meter long, with a diameter of 2 - 4 mm. Any one will do, even steel.
- - Flux with solder.
- - Plastic round junction box for the housing. Or any other.
Making an antenna for receiving digital television (DVB-T)
I will make an antenna to receive digital television channels. To begin manufacturing, you first need to calculate the dimensions of the future antenna. And to calculate the dimensions, you need to know the middle of the reception range of digital channels. The average frequency is approximately 690 MHz. If you want to make an antenna for analog channels, then take, say, 470 MHz for UHF, etc. (TV channel ranges can be viewed HERE)
Next we go here - ANTENNA CALCULATION
Enter the frequency and press “CALCULATE” and see what L1 is equal to. L1 is the square arm for the antenna.In my case, for a frequency of 690 MHz it is approximately 105 mm. The required number has been found, nothing else is needed.
Now we proceed directly to the construction of the bi-square antenna. We measure out approximately 90 cm of thick copper wire and bite it off either with wire cutters or pliers.
Next, we straighten the wire with our hands, making it smooth without the waves that formed after winding it from the reel.
We measure four 10.5 cm segments in a row on this wire.
Then we bend the double square. The wire is thick and bends with difficulty, which 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 the closed circuit.
We clean the connection points and future soldering.
We solder the circuit with solder and flux. Here it is better to use a more powerful soldering iron, since thick copper wire is difficult to heat up.
We strip the television cable and solder it to the antenna as in the photo.
In principle, the antenna is ready for operation. I won't stop there and will make a body for the central part.
Here's what I need.
Since the round box is too deep, I cut off exactly half with a hacksaw.
Then I will melt the grooves for the antenna with a soldering iron. This can be done with the same hacksaw.
I fill the connections of the wires with the body and the soldering points with glue.
All is ready. I'll hang the antenna outside the window on a nail.
I'll put a plug on the other end of the cable and plug it into the TV connector. To the antenna socket, of course.
I'll start an automatic channel search.
The result was not long in coming. The reception is excellent.
A simple cheap antenna that you don’t mind even if it’s stolen. I did this when I lived in a hostel and it worked just fine then.
Another huge advantage I think is that the antenna can be designed for almost any range, which is incredibly convenient.
