Once, while on vacation with an overnight stay in a tent on a wooded Bank of the river, found an annoyance: a portable TV operating off the car battery, bad was shown on the set of the antenna due to the weakness of the incoming signal. Then began experiments with aerial: spinning her this way and that, but to no avail. Then began to try to connect to the antenna and instead found in the boot of the wire. He was placed in different places, all sorts of curved loops, but otoh, too, almost gave nothing – UHF signal with a piece of wire was seen as bad.
It would be good to connect to a television receiver antenna “the wave channel”, but this, of course. in the tent did not produce. Need materials, tools, fasteners were not, solder, thread was nothing. And the desire to make special were not observed, because it came to relax, not antenna design.
However, the idea of the antenna did not give rest: how is it effective “framework wave channel” to do this quickly and from those materials that could be found on the place, well, at least from a Goy is the same wire that was available. But for this it was necessary to solve the problem of simple frames without tools or hardware.
Traditionally, they are held together even a metallic or dielectric pin by soldering, welding or screws by means of their upper sides. It happens that connect the middle and bottom sides of the framework, where the null voltage induced in the antenna signal, which allows to mount even a guide. Here not only had to meet alternate mounting frames — one from above and another from below (and so on).
Namely, in this, as it turned out, was quite substantial constructive feasibility. This connection framework allows you to perform all antenna “the wave channel framework” from one cut wire.
In figure 1 the antenna is shown in expanded form, which is then bent into the Assembly shown in figure 2.
To ensure a good stable reception antenna for it would be better to use a wire with minimum resistance, while all sizes of the antenna elements must be met as noted in the Handbook.
As the place of rest and close thick copper wire and directory of Amateur radio it was impossible to find. we had to be content with not the best reception, but only acceptable. But for this antenna you can use any random wire (even steel) of suitable diameter, just to be able to twist, and made the design had sufficient rigidity and bend under its own weight and the wind, for Example, the antenna consisting of 4 frames with a side length of 100 mm, can withstand the iron wire of diameter 0.6 mm and more.
On the wire determined the middle and from that place started to bend the first frame 1 in the form of a square with side length equal to a quarter wavelength of the received signal. If the stock wire, you can take the side of the square in half wavelengths. In the middle of the lower side of the frame (near to the ends of the wire) complied with the 2 twist both ends of wire at a length equal to one-sixth the length of accepted waves. Then again down the next two square frames 3 with the same twists.
After production of the fourth frame stranding no longer done, but instead curved open rectangle 5 (one side) of a quarter wave length and a width equal to quarter of the square’s side (of the framework). This matching transformer, it is located in the middle of the bottom side of the last square 4 in front of the strand. Of the remaining ends of the wire runs cool loop 7 with a diameter of 8 mm (the diameter of the annular contact of the antenna socket of the TV), bounded on both sides short, about two turns, with 6. The excess wire you need to break off, leaving the ends of the 8 a length of approximately 30 mm, which will then be used to secure the antenna to the TV.
Improvised antenna “the wave channel framework” (a) and its unfolding (b):
1 — the initial (first) frame; 2 — jumper-twist; 3 — middle; 4 — the last frame; 5 — matching transformer; 6 — short stranding; 7 — boarding-pin hinge; 8 — a stopper; 9 — insulated conductor cable; 10 — cable connection with the antenna; 11 — tube-support
If you place a frame one behind the other at a distance of one-eighth wavelength, arching for this strand 2 of the arc, as shown in figure 2., you get the antenna “the wave channel framework”. To connect it to the TV necessary tube 11 with a diameter of 8 mm, rolled of brushed tin cans. It is inserted in the annular contact of the antenna socket. Tube length should be such that the end spoke so much that he had to wear made aerial contact with a loop 7. The ends 8 of the wire abuts in the rear removable wall TV or. for example, it is inserted into the ventilation slots. Due to this tight fit hinge 7 into the tube 11, the antenna is mounted on the housing of the TV. The length of the end-stops 8 should be sufficient to ensure that this mount has performed well on a particular receiver.
In the antenna Central contact socket is inserted the stripped insulation from the end of the wire 9, the two coils wound on one shoulder of the transformer 5 (on the long side of the wire box). The other end of the wire 9, stripped from the insulation, fastened to the other shoulder of the transformer 5 at the point 10 of its transition to the side frame 4.
If the frequency of the received signal, and hence the wavelength, of the unknown, they can be approximated by the location of the TV arrows continuously tune the frequency of the received signal. You need to consider that the UHF range starts with a 21-channel, which signal has a frequency of 47 MHz and a wavelength of λ = 6.4 DM and ends on the 6th channel, which signal has a frequency of 79 MHz and wavelength λ = 3,8 DM. slack twists 2. fastening the frames to each other, is necessary for selection of (changes in) the size of frames to improve signal reception. For this you can unleash the extreme parts of the twists and through the vacant wire to increase the size of the framework. Conversely, increasing the length of the twists (and therefore the size of the arcs. the bent of them) leads to a decrease in the size of the frames. This stock can be as large if it is assumed the optimization of the antenna dimensions.
To find the best location of signal reception, the antenna port along with the TV. If the antenna socket is located vertically or at an angle, then you might be able to bend twist 7, and if that’s not enough, then the transformer 5. In this case you can do without the tube 11, instead of typing it into the antenna socket of the end-stops 8.
If the design to use as an indoor antenna, it is necessary to make it of thick copper wire with an optimal size, taken from the directory, and the support tube 11 soldered to the loop 9. Number of frames — the more. the better (up to 10 pieces).
For the fabrication of this antenna takes only a few minutes. In addition, if no in the presence of a solid coil wire, then the antenna can be collected from multiple segments of wire, aligning the seams on the twists.
SOLONIN, Konotop, Ukraine
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Once, while on vacation with an overnight stay in a tent on a wooded Bank of the river, found an annoyance: a portable TV operating off the car battery, bad was shown on the set of the antenna due to the weakness of the incoming signal. Then began experiments with aerial: spinning her this way and that, but to no avail. Then began to try to connect to the antenna and instead found in the boot of the wire. He was placed in different places, all sorts of curved loops, but otoh, too, almost gave nothing – UHF signal with a piece of wire was seen as bad.