If you live in the city, then you don’t necessarily need to have a large and bulky TV antenna, much less throw it on the roof and pull the cable. Digital television channels of the DVB-T2 standard can be perfectly received in the room, since the power of the transmitting towers is quite enough for reliable reception. I'll show you how to make a miniature home antenna of the Biquadrat type in 15 minutes. I also call it the Kharchenko antenna. This master class will save you from buying expensive Chinese analogues.
Typically, such structures are calculated using 1/4 wavelength. Such an antenna will receive all channels well even outside the city at a considerable distance, but at home (in the city) its size may seem a little large. And in fact, such sensitivity will be of no use. You can reduce all dimensions by half and take 1/8 of the wavelength as a calculation. The current antenna will be very tiny, but with sufficient sensitivity.
Will need
- Single-core wire 2.5 sq. mm - one meter is quite enough with a margin.
- A pair of plastic bottle caps.
- Antenna socket and cable for it and TV.
Making a miniature home antenna for digital television
The antenna circuit itself.This is perhaps the simplest and most common option, and we will make it even smaller.
We take the wire and, without removing the insulation, bend two identical squares with sides 67 mm with pliers.
We solder the joined ends and peel off a little insulation from the middle and tin.
Then, solder the socket on small wires. Using a utility knife, make cuts in the lid for the shoulders of the vibrators.
Fill everything with hot glue.
In the second cover we drill a hole for the socket and also glue it in with hot glue. We connect the covers and solder them with a soldering iron to make one whole. The antenna is ready.
Everything fits in the palm of your hand, so with the question “Where should I place it?” There shouldn't be any problems.
Result of work
We connect and direct to the tower.
I will compare the antenna with the same one, only full-size at 1/4 wavelength.
The level sensor will be a Chinese set-top box for receiving digital television.
Result:
- Classic Kharchenko antenna 1/4 wavelength, the set-top box gave - 40% sensitivity.
- Our reduced 1/8 wavelength version is 22%.
- And for comparison, let’s plug in a regular piece of wire - 1%.
Conclusion: When the size was halved, the sensitivity dropped by about the same amount. But, as you can see from the results, there is no comparison with a piece of wire.
At home, the antenna performed excellently. All channels are caught and received steadily, just like the full-size version. I recommend it for repetition.
