Antennas for the range of 144430 MHz

I love burn. I love myself on my own and I love working with them at UKH. And for a successful robot, you need good antennas. Ale antenna for robots from high mountain may buti persh for everything easy . And if you want to carry on your own construction, let’s say, 5-6 kg at a height of 1400-1800 meters, you don’t really want to - you have to pull a transiver with you, batteries and other touristic possessions. Before that, often you burn yourself out to get water - in the mountains you rarely get out.

I axis, having clearly shown myself what I myself want (I need a light yaga for eating on one cable at 144 and 430 MHz, at 1200 MHz I still have to work the antenna), I took up the jokes.

We have shown that a lot of companies have been producing new models for a long time. For example, in the house of an American company Cushcraft release 2 such antennas - A270-6Sі A270-10S:

At first glance, the bad antenna, navit nachebto for the description of stainless steel. Ale insults may be completely stupid type of eating (it is typical for most speeches from the American continent): 2 active elements of these antennas are powered stupidly through a splitter. So-so, not through a duplexer, but so - through a splitter. Tobto. for normal operation, you need to add additional antennas.

Before that, even more irrational victorious traverse - like in one, so in another design, the elements at 430 MHz do not occupy the entire її dovzhina. And tse at my glance - a serious nedolіk.

In a nutshell, regardless of the savory price ($110 and $150 for the US for A270-6S and A270-10S is reasonable), Cushcraft takes 2 fat minuses and the power to buy antennas is not known to me.

At the Japanese firm comet also 2 models: CYA2375і CYA25711. Good antennas, scarlet price... Not just arrogant, but cosmic! It's close to 12 and 18 thousand. rubles "here" for CYA2375 and CYA25711 is valid. Just stare at the pictures, lick your lips and forget about them. Axis CYA2375 and CYA25711:

So, well, who else is left with us? Yeah, having lost in us Diamond. At the moment, only one model is produced - A1430S7:

Inexpensive good antenna - close to 6500 UAH. "Here" is new in the box, and the coefficient of traversing is good. Ale - there are few elements, but it’s clear, and it’s strong not to shine. Thinking, thinking - and don't take virishiv.

Here, people in the know suggested me one more antenna. Maspro WH59SK. 5 elements at 144 and 6 at 430 MHz. Strength at 144 MHz is approximately 5dbd, at 430MHz approximately 8dbd, length 1.35m, shaft 1kg, bar diameter 22-32mm, input maximum 50 watts (FM). Compact, foldable, lightweight. Well, the antenna is good for everyone. Ale buli and 2 problems: 1) It is practically impossible to buy a new one, more than once, 5 as it is taken from the factory. 2) If you buy, then only second-hand, but second-hand ones begin to show their head water - through oxide, the contact at the rivets decreases and the SWR increases, the strength and the diagram decrease.

Axis photo antenna Maspro WH59SK:

Zagalom, poshukav-poshukav I more-less new WH59 - I don’t know. І virіshiv robiti 2-band yagu himself. About scho potim zhodnogo once without blowing.

Nedovgі searches on the Internet led me to Sergіy, RZ9CJ. It was bought by those who had a rich construction, with different diameters of the rod and traverse, at different ranges, with different strengths. Re-insurance in Mamanі and perevіrenі by dozens of people in practice. Well, they couldn't help but stink!

From the last wealth, having chosen the design - "5 + 7 - 5mm", the shards of 5 mm aluminum drіt should be hardened and vin mav:

Ale, as always, required a handful of sprouts of engineering puzzles. For example, why build a traverse? How to work the elements of the antenna, what is it to sit on the traverse, not to sway from side to side and not to drive back and forth on it? І at the same time, the elements are guilty at the same time, but they are fast-witted (or collapsible). Since they are foldable, how do you ensure good electrical contact with them? Mdya, the task is not simple ...

I'm a bit squeamish. Not sleeping for 2 hours 3 nights, thinking a lot:) Nareshti deyshov visnovka, so it’s hard to think badly, it’s more painful for your brain. And everything is just passed by plumbing stores, you can have a meal. I got it:

I know the axis of such a wonderful bracket for fastening metastate pipes to the wall in one of the unknown kiosks on the Bagration kilts (Vladivostok, I think, do not need to explain, de tse and sho tse). And the price - well, just bullshit! Usogo 9 (nine) rubles apiece!

After reviewing how to sit and brackets on a 20-mm pipe-traverse, it turned out that it was just wonderful to sit. Take it with your hand, it’s important to bring the strength to heal the bracket, blow the trumpet, to break yoga. Taking a couple of dozens, still thinking about the type of traverse. Choose from 2 pipe options - metastate or polypropylene. Having chosen a friend, she gave me a little bit of light and a little help for vigin, lower metastate. Before that, at the polypropylene pipe, there was a red line, there was a special kimono for facilitating the process of fixing the elements :)

Having cut down at the brackets the non-standard “antennae”, having drilled open 5 mm under the antenna element. Behind the angle of the fact that the plastic of the bracket is broken, the troch is less than 4.8 ... 4.9 mm and the element is trimmed in a new arc. Before that, after inserting the elements into the hot air, before such an operation, they played the bracket and the element with a great hair dryer for drying hair. After reaching the element from the bracket, it is not an easy task.

Let's just say everything is simple: so that the brackets with the elements did not move here and there and did not turn around the traverse, at the necessary points with self-tapping screws, which are stainless, pulling the M5 nuts to the traverse (the same is made of stainless steel):

The bracket with the antenna element, with its opening, is fastened in the center with a slot on the nut and is practically non-robust.

The axis looks like the antenna is ready at the assembly:

A axis larger plan:

For fixing the active element, having stuck such a thing with a textolite:

Here it is necessary to give an explanation. In the center of the center line of the plate made of textolite, a hole of 5 mm was drilled. under the active element, gave it a saw cut 15 mm wide in the center, approximately 1/4 of the thickness of the plate, so that it was easy to “lock” the 5 mm hole.

Then I just hammered the halves of the active elements from the skin side of the textolite plate so that there was a gap of 5-6 mm between them. So the halves of the active element are less likely to be rubbed on the rahunok (and it is necessary to say so).

It was not necessary to cut the middle sawing of the surface halves of the active elements with a file for their flat shape and screw the cable to them through the mounting pads.

And the axis is like a fixed fastening of the textolite plate to the bracket for fastening to the traverse:

The axis is a view of the cross for fastening to the pins. I think everything is clear here without comments:

Hocha, all the same about it is necessary to guess the technology of manufacturing U-shaped staples. At the sale of stench, in principle, є, ale є one small "ale" - the price is wild price. 400 (chotirista) rubles apiece. And it is necessary їх 4. Well, as if we already know too much ...

Well, I'll kill myself! A galvanized bar of a meter long length with a cut of M5 and a size of 50 rubles; In my opinion, they looked badly. Before that, the heat-shrinkable tube does not allow the traverse to be turned in such brackets when the M5 nuts are loosely tightened in the hand.

Well, here are two more photos: the disassembled antenna and already stored in a carrying case (made by Katya, UB0LAE):

Hundreds of rubles and a couple of evenings, stained on the antenna - the axis of the power price of the 2-band yaga :)

І namkinets schos type of program:

And the axis of the SWR graph is for the described antenna. Knowing the SWR meter Kuranishi Instruments RW-211A. The SWR values ​​turned all the points (for a good meaning of the word):

Vadim, UAØLTB
metro Vladivostok
October 14, 2011

At the time of writing, these articles have already won the same antenna 3 times for different minds. The drug is, perhaps, only on the traverse - after all, the polypropylene pipe is not enough zhorstka. During transportation, it often bends and is brought to straightening.

Dmitro RV9CX, having propagated a custom antenna, which is simply the one with a minimum of details

X-200 is a two-band (144/430) collinear antenna with a circular directivity diagram and a high gain coefficient.

The first such antenna was made in the style of the 90s and navit dosi pratsyuє.

The antenna is made completely (including all the coils) from a thick copper core with a diameter of 2mm without intermediate rations. Mustache cats are frameless. Capacitor С1 of vikonaniya z vіdrіzka coaxial cable SAT-703 with a length of 2 cm - vіn for the possibility of a robotic system on a 70 cm range. Capacitor C2 - povitryany, pіdstroyuvalny - їm i robimo nalashtuvannya antenna.

Well, with the electrical part, everything was clear - let's move on to the technical implementation.

The strength of the desire is not a wooden holder like a shovel (only cheap things are harder, they are sold at shops).

To the new one on the electrical tape (at once the food can be spun more beautifully, insanely) slightly (so as not to overtighten) tie up the skloplastika vodka, in the middle of which everything was avenged that was wound with an unbearable prace, tobto. the antenna itself is laid with foam pads in the breeze with mustache coils (L4 crim and condensers).

At live bait, 5 cm below the L4 coil, perpendicularly, but with a difference in height of 5 mm, two crossed openings were drilled - for future counters. The counters were inserted and soldered. Schematically, the mounting can be lowered

Scheme of fastening of the counterweight (view of the beast)

Now nailed.

Nasampered, it is necessary to adjust the parallel circuit C1 / L4 to the middle frequency of the 70 cm range - the wine itself allows the entire structure to live at these frequencies. Place of introduction L4 determines the transformation coefficient. Well, if there is nothing to distort, then just leave it out, like є. I have never re-verified the same time, tk. at that hour there was nothing.

I tried to fix more of the SWR meter readings right in the room, placing the antenna horizontally. The high steles permitted the death. Nalashtuvannya zdіysnyuєtsya wrappers of the rotor C2. It is necessary to indicate that it is not necessary to "take a look at once" to take the necessary indications for the weather at once in both bands, it is necessary to select the L4 coil.

At the result, I took off even good indicators for the weather:

145MHz - SWR = 1.03

435MHz - SWR = 1.02

After nalashtuvannya, the beast on the vuzol was later put on an empty dance from the Sprite, as it protected all the critical parts of the water. After 10 years, the dance has lost its green color.

The practical work of the ether showed the practicability of the system, the zocrema. the kind por_vnyano z firmovimi products. At the link with which, this design was repeated more than once. Tim more, that the coefficient of її repeatability is already high for the ordered technology and її preparation.

Chinese kolіnearnu UHF-antenna of stationary installation. Judging from the observations, the antenna is not bad.

Roztin showed that with the bazhann, such a design can be prepared independently.

Let's take a look at the declared characteristics

Delivery set includes antenna, counters, metal tube and brackets

Instructions from the installation

Photo at the collection

Now find more. I remove the star-shaped bolt and remove the antenna elements from the plastic pipe. Photo clickable

Phazozsuvna cat

Uzgodzhuyuchy contour on the antenna base. I wanted to believe that the coil is wound on fluoroplastic, but after all it is polyethylene. The static guard ensures that the antenna elements are grounded to the steady stream. The central core of the cable is connected through a capacitor

The antenna arrived with a soldered coil and a capacitor lead. I had a chance to pay

The most foldable element

Counterweights per quantity 6 pieces

As having shown the zamіr SWR, the antenna is vіdminno nalashtovana. The SWR value at the 2m and 70 cm ranges does not exceed 1.2, at the center - 1.

A short time ago, for work on the range of 144-145 MHz, mostly self-contained equipment was victorious. Among the radioamators were popular UKH - transverters, rich in their own dimensions, they were parallel with the transiver itself, which victorious with it. Radioamatori converted decommissioned industrial UHF radio stations of the "Palma" type to the amateur UHF band of 145 MHz, removing the radio station that is used on dekilkoh channels. Then radioamators became available "Voli", and later - "Mayaki", which works on forty channels. Tsі radio stations todі looked just fantastic for their ability!

In this hour, it is possible to replace cheaply with rich-channel portable UHF transceivers from all-world firms - YAESU, KENWOOD, ALINCO, which, according to their parameters and efficiency, can significantly turn over as a self-contained equipment in the range of 145 MHz, so I will rework the promise - Palmistry. ”, “Lighthouses”, “Violi”.

Ale for work through a repeater at home, office, every hour while working from a car, an efficient antenna is required, lower vikoristovuvana with a portable radio station "humka". When using a stationary "company" UHF station, it is often possible to vicorate a self-contained UHF antenna with it, the fragments of a decent "company" antenna with a range of 145 MHz are not cheap.

Preparation of simple self-contained antennas, attached to vikoristannya with stationary and portable UKKh - radio stations and assignments of this material.

Features of antennas for the range of 145 MHz

For those who, for the preparation of antennas in the range of 145 MHz, should sound a vicorous wire - with a diameter of 1 to 10 mm (and sometimes stop and work with other vibrators, especially in commercial antennas), then antennas in the range of 145 MHz wide range. Tse often allows you to do without additional adjustment to the range of 145 MHz when the antenna is fixed exactly according to the specified dimensions.

For tuning antennas in the range of 145 MHz, you need a mother SWR - meter. Tse mozhe buti as a self-confident attachment, so i promyslovy virobnitstva. On the range of 145 MHz, radioamators practically do not vicorize the bridges of the antennas, due to the folding of their correct preparation. If, with careful preparation of the bridge vimiruvach and, then, correct operation on the same range, you can accurately determine the input opir of the UHF antennas. Ale navit vikoristovuyuchi less SWR - a meter of the pass-through type, as a whole it is possible to install self-contained UHF antennas. Intensity 0.5 W, to ensure the import of portable radio stations in the "LOW" mode and domestic radio stations of the UKH range of the "Dnipro", "Viola", "VEBR" types, as much as possible for robots with a wide range of SWR meters. The "LOW" mode allows you to tune the antenna, not being afraid to get out of the fret of the outgoing cascade of the radio station with any input antenna support.

Before the spatula of the UKKh antenna, it is necessary to change the position of the SWR meter for the correct reading. Bad mother two SWR-meters, rozakhovanih to work in the transmission paths 50 and 75 ohms. When the UHF antennas are installed, it is necessary to use a control antenna, which can be either a “humka” in a portable radio station or a self-contained quarter-width shtir. When the antennas are adjusted, the voltage level of the field of the creation of the antenna is adjusted to the control one. It gives you the opportunity to judge the equal efficiency of the robotic antenna that is being tuned. Obviously, when victorizing the standard calibration of the field strength, you can accurately assess the efficiency of the antenna robot. When varying the calibrated vimiruvach field, it is easy to take the diagram of the directivity of the antenna. Alternately navit vikoristovuyuchi when vimiryuvannyah self-contained vimirniki field strength and otrimivsya only a similar picture of the distribution of the strength of the electromagnetic field, you can create visnovo about the efficiency of the robotic antenna, which is good, and approximately estimate the degree of direct access. Let's take a look at the practical design of UHF antennas.

Sorry antennas

The most simple UHF antenna (Fig. 1) can be used with a variety of antennas, which works together with a portable radio station. On the frame of the window from the outside (small 2) or on the inner side on a wooden block, which is supported, a metal coil is attached, in the center of which a nest is installed for connecting the antenna. It is necessary to bend before the coaxial cable that goes to the antenna, which is the minimum necessary length. At the edges of the fold, 4 counters are fastened with a length of 50 cm. The antenna of the radio station is shortened and the input support at the boundary is 30-40 ohms, so for living it is possible to twist the coaxial cable with a 50 ohm support. For the help of a kuta, it is possible to change the input of the antenna, and, also, to install an antenna with a coaxial cable. The deputy of the company's "gumka" timchasovo can win the antenna from the mid-range dart with a diameter of 1-2 mm of the zadovka 48 cm, which is inserted into the antenna nest with its own hospitable kіntse.

Figure 1. A simple VHF antenna call

Malyunok 2. The design of a simple UHF antenna

Nadiyano pratsyuє UKKh antenna, vikonana z coaxial cable zі znyatim zvnіshnіm braiding. The cable is laid in a high-frequency rose similar to the rose of a "company" antenna (Fig. 3). The length of the coaxial cable, which is to be repaired for the preparation of the antenna, is 48 cm.

Figure 3. A simple self-contained UHF antenna

For swedish preparation of a wine UKH antenna, it is possible to vicorate a coaxial cable with a length of 2-3 meters, a kind of roses, which is used to support the antenna socket of the radio station and antenna. An antenna up to such a cable can be connected to an additional high-frequency tripe (Fig. 4). In this way, from one end of the tee, the “gumka” antenna is connected, and from the second end of the tee, counters with a length of 50 cm are wound, or another type of radio technical “earth” for the UKH antenna is connected through the rose.

Figure 4. A simple VHF antenna

Self-contained antennas, portable radio stations

When using or breaking the standard antenna of a portable radio station, you can replace a self-contained twisted UHF antenna. For this vicorous base - polyethylene insulation of a coaxial cable, with a diameter of 7-12 mm and a length of 10-15 cm, on which a coil of 50 cm of a middling wire with a diameter of 1-1.5 mm is wound. To adjust the torsion of the antenna, you can also manually tweak the frequency characteristics, or you can tweak the SWR meter. Firstly, the resonant frequency of the selected antenna is set, then, by blowing a part of the turns, destroying, pinking the turns of the antenna, adjust the twisted antenna to resonance at 145 MHz.

The procedure is not too complicated, and, having installed 2-3 twisted antennas, the radioamator can work on fitting new twisted antennas literally for 5-10 minutes, obviously, for the obviousness of the twisted antennas. After fitting the antenna, it is necessary to fix the turns either behind the additional electrical tape, or behind the additional cambric soaked in acetone, or behind the additional tube, which is heat-shrinkable. After fixing the coils, it is necessary to control the frequency of the antenna once again, and it is also necessary to apply it for the help of the upper coils.

Keep respect for those who have "firm" short twisted antennas with vicorous heat-shrinkable tubes for fixing the antenna conductor.

Napivkhvil's floor antenna

For efficient operation of antennas with a quarter of a quarter, it is necessary to vicorate a sprat of four quarters of counters. This is a compli- cated design for a floor-to-ceiling quarter-violet antenna, as it may be found in the open space of a UKH transceiver. In this way it is possible to use a UKH antenna with an L / 2 electric cable, which does not mean for its robotic opponents, and safely pressed to the ground straightness diagram and ease of installation. For an antenna with an L / 2 electric base, there is a problem of using a high input support with a low coaxial cable support. Antenna with a length of L / 2 and a diameter of 1 mm; Use for the help of a quarter-wave resonator, it is optimal in this situation, do not start it handy, practically, the stones will help you select the connection point of the coaxial cable to the resonator for efficient operation and precise adjustment of the antenna pin to resonance. Also, the resonator size is clearly large for the 145 MHz band. Destabilizing factors on the antenna for її uzgodzhennia for the help of the resonator will be especially strong.

However, with small strains, which are brought to the antenna, the full benefit can be reached behind the auxiliary P-circuit, similarly as described in the literature. The scheme of the napіhvilovoї antenna and її uzgodzhuvalny outbuilding is shown in fig. 5. The length of the pin of the antenna is chosen to be shorter or longer for the length of the length L/2. This is necessary for the fact that with a small power of the electrical antenna in L / 2, the active support of the antenna impedance noticeably decreases, and the reactive part at the cob stage of growth is insignificant. As a result of the best possible improvement for the additional P - the contour of such a shortened antenna with greater efficiency, the lower utility of the antenna is equal to L / 2. It is important to win the antenna with a double troch large lower L / 2.

Figure 5. UHF antenna for auxiliary P-loop

At the uzgodzhuvalny outbuilding, there were vikoristan repeated substroyuvalny condensers of the KPVM-1 type. Coil L1 to sweep 5 turns of a silver dart with a diameter of 1 mm, wound on a mandrel with a diameter of 6 mm and a crochet of 2 mm.

The alignment of the antenna is not foldable. Having included in the path to the cable of the antenna SWR - meter and at once vimiryuyuchi the level of the field strength, created by the antenna, for the additional change of the capacity of the changeable capacitors C1 and C2, the compression-stretching of the coils of the coil L1, the minimum readings are shown in the maximum SWR-meter field. If two maxima will not increase, it is necessary to change the length of the antenna and repeat the adjustment again.

Uzgodzhuyuchy pristroy buv podmіshcheny at the corps, soldered from foil-coated sklotekstolіtu size 50*30*20 mm. When working from a stationary working station of the radioamator, the antenna can be placed at the window. When working in the field of minds, the antenna can be raised by the upper end of the tree for additional hair, as shown in fig. 6. A 50-ohm coaxial cable can be used to live the antenna. Vykoristannya 75-ohm coaxial cable deshcho zbіl zbіl zbіl zbіl zblіl kkd uzgozhuvalnogo podstroy antenna, but at the same time vmagatuvannya cascade outward cascade of the radio station for work on the input 75 ohm.

Figure 6. Installing the robotic antenna in the poles

Vіkonnі antennas based on foil

On the basis of foil, which can be glued, which is victorious in security signaling systems, it is possible to induce even simpler designs of vertex UHF antennas. Such a foil can be added already with an adhesive base. Todi zvіlnivshi one bіk foil vіd zahisnogo ball, just squeeze it to the fold and the foil instantly sticks. Foil without adhesive base can be glued to the warehouse for additional varnish or glue type "Moment". Ale for whom it is necessary for the mother of a new novice. The foil can be fixed on the window for an additional sticky stitch.

With a double-width circuit, it is possible to add a soldered wire to the central wire that braided the coaxial cable with aluminum foil. Vykhodyachi z special permission, leather type of such foil is used for soldering its flux. Deyak types of foils are well soldered to vicarious rosin, deyaks are soldered for additional soldering fat, other types of foil are used to use active fluxes. Flux needs to be tested on a specific type of foil, vicory-coated antenna, long before installation.

Good results are given by using a lining made of foil-coated cloth for soldering and fastening foil, as shown in fig. 7. A piece of foil-coated sclotextolite for additional glue "Moment" is glued to the fold, the antenna foil is soldered to the edges of the foil, the wires of the coaxial cable are soldered to the middle foil of the sclotextolite on a small section of foil. After soldering, it is necessary to protect it for additional water-resistant varnish or glue. Otherwise, corrosion can occur on the floor.

Figure 7. Connecting the antenna foil to the coaxial cable

Let's take a look at the practical design of vertex antennas based on foil.

Vertical Dipole Antenna

The scheme of a vertical dipole VKH antenna based on foil is shown in fig. eight.

Malyunok 8. Viconna vertical dipole UHF antenna

A quarter-width line and anti-aggression roztashovani under a cut of 135 degrees in order to bring the input opir of the antenna system closer to 50 ohms. Tse gives the opportunity to victorize for living the antenna coaxial cable with a 50 Ohm hvilyovym support and to victorize the antenna together with portable radio stations, the output cascade of which may be such an input opera. The coaxial cable is supposed to run perpendicular to the antenna along the slope as long as possible.

Frame vison antenna based on foil

Effektivnіshe dipole ї vertical ї antenna pratsyuvatime frame vykonna UHF antenna, is shown in fig. 9. When the antenna is animated from the bottom end, the maximum of the enhanced polarization of the expansions is near the vertical plane, when the antenna is animated in the lower corner, the maximum of the enhanced polarization is in the horizontal plane. Ale, if any position, the live points of the antenna vibrate radio waves, with a combined polarization, both vertically and horizontally. Tsya the situation is more favorable for communication with portable and portable radio stations, the position of the antennas for any hour changes.

Figure 9. Frame viconna UHF antenna

The input support of the frame antenna should be 110 ohms. To accommodate this support with a coaxial cable with a 50 ohm pole, a quarter-wave section of the coaxial cable with a 75 ohm pole is used. The cable must run perpendicular to the axis of the antenna for as long as possible. The loop antenna can be approximately 2 dB stronger than that of a dipole windscreen antenna.

When vikonnі vіkonnih antennas with foils 6-20 mm wide, the stench does not change, and it works in the frequency range of the significantly wider, lower amateur range of 145 MHz. If the resonant frequency of the antennas was removed, it appeared to be lower for the need, then the dipole can be fixed, symmetrically cutting the foil with yogo tips. The frame antenna can be fitted with a vikoristan jumper with thin foil, which was used to prepare the antenna. The foil locks the antenna sheet into the coddle, on the contrary, the point of life. If the contact of the jumper with the antenna is adjusted, it can be safe either for additional soldering or for additional adhesive sticky lines. Such a sticky line is to be pressed strongly against the web of the antenna, in order to ensure proper electrical contact with it.

Up to the antenna, covered with foil, it is possible to bring significant equal tightness - up to 100 and more watts.

Zovnishnya vertical antenna

When placing antennas, the plant should be installed about the protection of the opening of the coaxial cable from atmospheric vents, the victorious antenna support insulator, the moisture-proof wire for antennas, etc. These problems can be eliminated by hacking the protected zonal UHF antenna. The design of such an antenna is shown in fig. ten.

Figure 10. UHF antenna protected

At the center of a plastic water pipe with a length of 1 meter, pass an opening, into which a coaxial cable can be tightly wound. Then the cable stretches out, hangs from the pipe, exposes itself with a 48 div winder, the screen of the cable twists and solders on the 48 div. The cable behind the antenna is wound up at the pipe. Above and below the pipe are fitted with standard plugs. Vologoizolyuvati otvir, where to enter the coaxial cable does not become especially difficult. You can also use automotive silicone sealant or automotive epoxy, which is harder. As a result, an absolutely beautiful, water-insulated antenna, as a rich rock, can be used under the influence of atmospheric inflows.

To fix the vibrator and the antenna contra in the middle, you can twist 1-2 cardboard or plastic washers, which are firmly placed on the antenna vibrator. The pipe with the antenna can be installed on a glass frame, on a non-metal box, or placed in another handy place.

Simple coaxial collinear antenna

A simple coaxial coaxial UHF antenna can be connected to a coaxial cable. For zahistu tsієї antennas in the form of atmospheric inflows, you can use vikoristany in the vіrіzok of the water pipe, as described in the front paragraph. The design of the collinear coaxial UHF antenna is shown in fig. eleven.

Figure 11. Simple collinear UHF antenna

The antenna is theoretically stronger, not less than 3 dB more equal to the quarter-length vertical. She won't need any counters for her work (want to have a better antenna for her work) and securely press the straightness diagram to the horizon. The description of such an antenna was repeatedly published on the sides of the domestic and foreign radio amateur literature, and most of all, in the distance, the description of the views of the literature.

Expand the antennas to small. 11 specified in centimeters for a coaxial cable with a shortening factor equal to 0.66. Such a shortening factor may be more coaxial cables made of polyethylene insulation. The opening of the narrow loop is shown in fig. 12. Without a different antenna, the SWR of the antenna can overshoot 1.7. If the antenna was tied to a lower band of 145 MHz, it is necessary to shorten the upper section a little, if higher, then hold it down. Obviously, it is possible to optimally adjust the proportion to the shortened-lowered parts of the antenna, but it is still easy to work in the radio amateur's minds.

Figure 12

Regardless of the large size of the plastic pipe, necessary for the protection of the antenna from the atmospheric inflows, the antenna of the colinear design of this design is as large as possible. The antenna can be worn at the bіk vіd budіvlі behind the help of wooden slats, as shown in fig. 13. The antenna can show significant tension, which is brought up to it, up to 100 and more watts, and can be vikoristan in combination with both stationary and portable UHF radio stations. The use of such an antenna in combination with low-power radio stations, which can be worn, will give the greatest effect.

Figure 13. Installation of a collinear antenna

Simple collinear antenna

This antenna was chosen by me similarly to the design of a car wine antenna, which is featured in a stylish radiotelephone. To convert it to the amateur band of 145 MHz, I changed proportionally all the dimensions of the telephone antenna. In the aftermath of which antenna was used, the scheme of which is shown in fig. 14. The antenna is securely pressed to the horizon with a straightness diagram that is theoretically stronger than 2 dB over a simple quarter-width dash. For the life of the antenna, a coaxial cable with a 50 ohm support is used.

Figure 14. Simple collinear antenna

The practical design of the antenna is shown in fig. 15. Antenna bula vikonana z іlogo vіdіzka medny drotu 1mm in diameter. Coil L1 took 1 meter of the dart, wound on a mandrel with a diameter of 18 mm, between the coils it was extended by 3 mm. With a vikonannі design, just beyond the dimensions of the antenna, practically does not require any adjustment. It is possible to need a small installation of the antenna to tighten-stretch the coils of the coil to achieve the minimum SWR. The antenna was placed at the plastic water pipe. All the way, trumpet the antenna wire for fixing behind the additional shmatochkіv styrofoam. On the lower end of the trumpet, a couple of quarter-villian counters were installed. They were carved with carvings, and the stench for additional nuts was fixed on a plastic pipe. Countervailers can be 2-4 mm in diameter, depending on the possibility of cutting on them. For their preparation, you can zastosuvat medny, brass or bronze wire.

Malyunok 15. The design of a simple collinear antenna

The antenna can be mounted on wooden slats on the balcony (as shown in Fig. 13). Tsya antenna can show significant equal tension, which is brought to it.

Qiu antenna can be seen as a shortened HF antenna with a central coil, which is lowered. Indeed, the resonance of the antenna in the HF band appeared in the frequency region of 27.5 MHz for the help of the bridge support. It is obvious that by varying the diameter of the coil and її dovzhina, but if you take the other dart її winding, you can ensure that the antenna works both in the UHF band of 145 MHz, and in one of the HF bands - 12 or 10 meters. For operation on HF bands to the antenna, it is necessary to connect a pair of counters with L / 4 for the selected HF band. Such a sub-wire of victorious antennas is more universal.

Experimental 5/8-wiel antenna

When carrying out experiments with radio stations in the range of 145 MHz, it is often necessary to connect an antenna to the outgoing stage in order to reverse the path of the receiving radio station, or to set up the outgoing transmission stage. For whom I have been victorious for a long time, it is simple 5/8 - a Khvilyov UKH antenna, a description of which was induced in the literature.

The antenna is folded from a section of a mid-range rod with a diameter of 3 mm, which is one end of the connection with a coil, which is lower, and the other with a tuning section. At the end of the dart connected with the coil, a thread was cut, and at the other end, a tuning section was soldered from the middling dart with a diameter of 1 mm. Use the antenna with a coaxial cable with a support of 50 or 75 ohms with a path connected to different turns of the coil and may be a small shortening of the tuning section. The antenna scheme is shown in fig. 16. The design of the antenna is shown in fig. 17.

Figure 16. Scheme of simple 5/8 - fluted UKH antenna

Malyunok 17. Simple design 5/8 - soft UKH antenna

Vikonan coil on a plexiglass cylinder with a diameter of 19 mm and a length of 95 mm. At the ends of the cylinder there is a ribbed cut, in a yak from one side the antenna vibrator is screwed, and from the other side it is screwed up to a piece of foil-coated sclotextolite with a size of 20 * 30 cm, which is the “ground” of the antenna. From the rear side to the new one, there is a magnet attached to the old speaker, after which the antenna can be attached to the vent, the battery, and other external objects.

Coil to sweep 10.5 turns of a dart with a diameter of 1 mm. Prov_d kotushki rіvnomіrno razm_shcheny on the frame. The entry to the coaxial cable is connected to the fourth turn from the grounded end. The antenna vibrator is screwed into the coil, a contact lamella is inserted under the new one, until the “hot” end of the coil is soldered, which is held. The bottom end of the coil is soldered to the antenna ground foil. The antenna ensures the SWR of the cable is not higher than 1:1.3. The lashing of the antennas is shortened with a shortened path for an additional wire cutter of the upper part, so that the trochs of the dorshoy are scrambled, lower is necessary.

I have carried out experiments on how to install the antenna on the shibts. In this case, the vibrator of the cob length 125 centimeters from aluminum foil is glued in the center of the window. The podovzhuyucha kotushka was the same, and it was installed on the frame of the window. Opponents were wicked from foil. The ends of the antennas and the counters were bent, so that they could fit on the shibbs. View of the 5/8 - hvilyov UKKh antenna of indications in fig. 18. The antenna is easily tuned into resonance with progressive shortening of the vibrator foil for additional support and progressive switching of the coil coils at a minimum SWR. Vіkonna antenna not psuє іnter'єru kіmnati і can vikoristovuvatisya like a permanent antenna for work on the band 145 MHz from the house or office.

Malyunok 18. Vikonna 5/8 - Khvilyov UKH antenna

Effective portable radio antenna

In that case, if the connection to the standard “humka” is not possible, it is possible to vicorate a napivhvil's antenna. Vaughn does not care for his work "earth" and when working on a large windmill, he wins over the pair with a standard boom up to 10 dB. The whole number is real, vrakhovuchi, that the physical length of the napіvhvilovoj antenna may be 10 times more for the "gumka".

Napіvhvil's antenna live tenaciously and may be a high input opіr, which can reach 1000 ohms. Otzhe, tsya antenna vymagaє uzgodzhuvalnogo pristroy at vikoristannі spilno z radio station, scho may 50-ohm vihіd. One of the options for the narrower extension on the basis of the P-contour is the same as the descriptions of the others. Therefore, for the sake of diversity for the antenna, we can look at the vikoristanya of the other uzgodzhuvalny outbuilding, hung on the parallel circuit. According to the efficiency of their work, and the use of extensions, they are approximately equal. The scheme of the nap_vilovoї UKKh antenna at once from the narrow attachment on the parallel circuit is shown in fig. 19.

Malyunok 19

The spool of contour should be covered with 5 turns of a silver-plated dart with a diameter of 0.8 mm, wound on a mandrel with a diameter of 7 mm behind a dove of 8 mm. Adjustment of the uzgodzhuvalnogo podstroy in the adjustment of the secondary capacitor C1 to the L1C1 circuit resonance, after the auxiliary capacitor C2, the connection to the circuit with the transmission output is regulated. On the back, the capacitor is connected to the third turn of the coil from the grounded end. Replaced capacitors C1 and C2 are due to a reverse dielectric.

For the antenna vibrator, it is possible to use a telescopic antenna. Tse allow to transfer napіvhvilovu antenna in a compact folded stand. Also, I'll ask you to install the antennas at once from the right transiver. With the cob lashing of the antenna, the length of the length should be 100 cm. Bazhano zrobiti vіdpovіdnі signs on the antenna, schob zі zі gornuty її position vstanovlyuvat antenna vіdrazu resonant dozhina. The box, de-rotting the uzgodzhuvalny attachment, is guilty of buti vikonan from plastic, to change the capacity of the coil to the "ground", you can buti vikonan from foil sclotekstolytu. See the real operational minds of the antenna.

The adjustment of the antenna is required for the additional indicator of the field strength. For the help of the SWR - the meter for adjusting the antenna is no longer necessary for different robots not on the body of the radio station, but with a different coaxial cable with it, which I put on.

При подвійній роботі антени на корпусі радіостанції і з використанням коаксіального кабелю, що подовжує, на штирі антени роблять дві позначки, відповідні одна – максимальному рівню напруженості поля, при роботі антени на корпусі радіостанції, а інша ризику відповідає мінімальному КСВ при використанні спільно з антеною кабелю . Ring out, the two signs of the troch do not escape.

Vertical non-robust antennas with din for convenience

Vertical antennas with a full vibrator stand up to the wind, easy to install, and take up little space. For їх vikonannya it is possible to vikoristovuvaty copper tubes, aluminum power wires with a diameter of 6-20 mm. Qi antennas can be easily connected with a coaxial cable with a whip support yak 50 so 75 Ohm.

It is even simpler for the Vikonann, it is easy to install and non-robust for the UHF antenna, the design of which is shown in fig. 20. For living through a coaxial cable, the gamma of the weather is overcome. The material, for which the vibrator of the antenna and gamma is used, is to blame for the very same, for example, copper or aluminum. Through mutual electrochemical corrosion of rich pairs of materials, it is unacceptable to beat different metals for the antenna and gamma of the weather.

Malyunok 20

As for the vikoristan antenna, the vikoristan is a mid-naked tube, then the gamma should be adjusted to the antenna dotally behind the help of a flickering jumper, as shown in fig. 21. In this case, the surface of the pin and conductor of the gamma ray is resolutely cleaned and behind an additional clamp with a bare dart, as shown in fig. 21a reach the minimum SWR for the coaxial cable to live the antenna. Let's see here the din of flattening, the trochs are flattened, drilled and screwed with a screw from the antenna canvas, as shown in fig. 21b. You can also vikoristovuvati soldering.

Figure 21

As for the antenna of vikoristany aluminum wire from the power electric cable at the plastic insulation, then it is enough to remove the insulation to protect the corrosion of the aluminum wire with acidic boards, which are inevitable in the minds of the mind. In this direction of the din, the antenna is subdued behind the help of a replaceable capacitor, as shown in fig. 22. This capacitor must be seriously protected from water. If you do not know how to reach the SWR for the cable is less than 1.5, then the gamma should be increased by changing it and repeating the adjustment again.

Figure 22

For the presence of a sufficient space and materials, it is possible to install a non-robust vertical fiber UHF antenna. Whilst antenna is more efficient than the hvil's antenna, shown in fig. 20. Hvil's antenna is more securely pressed to the horizon to the straightness diagram of the lower napivhvil's antenna. It is possible to use a winding antenna using additional methods shown in fig. 21 and 22. The design of the whip antenna is shown in fig. 23.

Figure 23. Non-expandable vertical fiber UHF antenna

When vykonannі tsikh antennas, it is necessary to use a coaxial cable for living, perpendicular to the antenna, wanting to be 2 meters. I will use a symmetrical add-on at the same time from a non-expanding antenna to increase the efficiency of your work. When victorious symmetrical outbuildings, it is necessary to vicorist the symmetrical din of pleasure. The connection of the symmetrical outbuilding is shown in fig. 24.

Figure 24

As a symmetrical attachment of an antenna, it is also possible to vicorate whether it is any other type of symmetrical attachment. With the placement of antennas for conducting objects, it is possible to change the length of the antenna by adding them to certain objects.

Round UHF antenna

Yakshcho placement near the expanse of vertical antennas, shown in fig. 20 and fig. 23 it is difficult for their traditional vertical position, then you can space them out by burning the antenna cloth into a colo. The position of the navel antenna is shown in fig. 20 for the "round" version is shown in fig. 25 and the coil antenna is shown in fig. 23 in fig. 26. This position of the antenna ensures a combined vertical and horizontal polarization, which is suitable for making calls with portable and portable radio stations. Although, theoretically, the vertical polarization level will be greater with the live life of round UHF antennas, but in practice the visibility is not very noticeable, and the antenna is easier to install. The side eating round antenna is shown in fig. 27.

Malyunok 25

Figure 26. Non-expansive circular vertical HF UHF antenna

Malyunok 27. Lateral eating of round UKH antennas

A round UHF antenna can be placed in the middle of the premises, for example, between the window frames, or the posture of the premises, on the balcony or on the dahu. When a round antenna is placed near a horizontal plane, a circular straightness diagram is taken away from the horizontal plane and the antenna works with horizontal polarization. Tse mozhe buti nebhіdno at deyakih vipadkah pіd hour conducting radioamatorskih zv'yazkіv.

Passive "pidsiluvach" portable station

When testing portable radio stations or robots with them, for an hour there is not even a trifle of tension for an overhead call. I have made a passive “pidsiluvach” for portable UHF stations. Passive substation can add up to 2-3 dB to the signal of the radio station on the air. This is often enough to open the noise suppressor of the correspondent's station and to ensure the work of the correspondent. The design of the passive pidsiluvach is shown in fig. 28.

Figure 28. Passive "podsiluvach"

Passive "pidsiluvach" є luzhennoy plashankoy z-pіd kavi dosit great rosemіrіv (which is more, it's more beautiful). At the bottom of the can of inserts are roses, similar to the antenna of the rose of the radio station, and the lid of the can is soldered with roses to connect with the antenna nest. To the jar soldered 4 counters of the zavdovka 48 cm. For a larger effective "earth" and an increase in the power of the received signal is expected. At the same time, with this "podsilyuvachem" one can vikoristovuvat іnshі antennas, for example, L / 4 pins from the mid-range dart, just inserting the socket into the antenna.

Shirokosmugov's surveying antenna

A lot of imported portable radio stations can be used by the robot for reception not only in the amateur band of 145 MHz, but also in the general bands of 130-150 MHz or 140-160 MHz. In this case, for successful reception in the round-trip bands, on which the antenna is twisted, lashed at 145 MHz, it is practically ineffective to use a wide-range UHF antenna. The antenna scheme is shown in fig. 29 and rozmіri for different ranges of robots is induced in Table. one.

Malyunok 29. Wide-range VHF vibrator

Table 1. Wide range UHF antennas

For work with an antenna, a coaxial cable can be twisted with a 50 Ohm whip support. The cloth of the antenna can be worn with foil and pasted on the window. It is possible to wrap the antenna fabric from an aluminum sheet or in a different way on a piece of foil-coated sclotextolite of various sizes. Qia antenna can be used for receiving and transmitting in certain frequency bands with high efficiency.

Zigzag antenna

At some service UKH radio stations, telecommunications, antenna arrays are built up from zigzag antennas. Radio amateurs can also try different elements of such an antenna system for their work. View of the elementary zigzag antenna, which is included before the design of the folding UKKh antenna, the indications in fig. thirty.

Figure 30. Elementary zigzag antenna

A zigzag-like elementary antenna is folded over a nap-v-vil dipole antenna, so as to live with an elastic vibrator. Real antennas have up to five such vibrating vibrators. Such an antenna can be squeezed to the horizon to the straightness diagram. Type of polarization of antenna combinations - vertical and horizontal. For a robotic antenna, it is necessary to vikoristovuvati simeruyuchy pristriy.

In the antennas of the victors at the service stations, a link behind the elementary zigzag-like antennas should be placed by a reflector, vikonans from a metal grid. The reflector ensures the one-way alignment of the antenna. Depending on the number of vibrators included in the antenna and the number of zigzag antennas included at once, you can take the necessary coefficient of antenna strength.

Radioamatori practically do not vicorate such antennas, although they are inconveniently vikonati for amateur UHF bands of 145 and 430 MHz. For the fabrication of the antenna fabric, it is possible to vicorate aluminum wire with a diameter of 4-12 mm as an electric power cable. In the domestic literature, a similar antenna was described, for the canvas, which was a thick coaxial cable, it was pointed out in the literature.

Antenna Kharchenko in the range of 145 MHz

Antena Kharchenko is widely used in Russia for receiving television broadcasts and for service radio communications. Ale radioamatori її vikoristovuyut for robots on the 145 MHz band. This antenna is one of the few, as it works even more effectively, and practically does not require adjustment. The diagram of the Kharchenko antenna is shown in fig. 31.

Malyunok 31. Antena Kharchenko

For a robotic antenna, you can use both 50 and 75-ohm coaxial cable. The antenna is wide-width, working at smooth frequencies of at least 10 MHz on the 145 MHz band. To create one-sided straightness diagrams with vicorist, use a metal mesh at the back of the antenna, stitched with a winder (0.17-0.22) L.

Antenna Kharchenko ensures the width of the pellust with straightness diagrams at the vertical and horizontal planes close to 60 degrees. For an even greater sound, the passive elements, like vibrators with a 0.45L dove, are rolled with a 0.2L winder along the diagonal of the frame square. For the creation of a narrow straightness diagram and an increase in the coefficient of strength of the antenna system, a sprat of combined antennas is used.

Frame directing antennas for the range of 145 MHz

One of the most popular directing antennas for robots in the 145 MHz band is loop antennas. The largest width on the 145 MHz band is a two-element loop antenna. And here the optimal spіvvіdnoshennia “vitrate/yakіst” comes out. The scheme of a two-element frame antenna and the perimeter of the reflector and the active element is shown in Fig. 32.

Figure 32. Ramkov UKH antenna

Elements of the antenna can be fixed at the look of a square and at the look of a stake, delta. To improve the performance of the vertical warehouse antenna, it can be powered from the side. The input of a dual-element antenna is close to 60 ohms, and for work with it, it is suitable for both 50-ohm and 75-ohm coaxial cable. The gain coefficient of a two-element frame UHF antenna should be no less than 5 dB (above the dipole) and the difference between the direct and reverse direct can reach 20 dB. When working with a cієyu antenna, it is necessary to draw a symmetrical attachment.

Circularly polarized loop antenna

The design of the loop antenna with circular polarization was proponated in the literature. Antennas that can achieve circular polarization vikoristovuyut for communication through SHSS. The suspension of the loop antenna with a 90-degree phase angle allows synthesizing radio waves, which can have circular polarization. The live scheme of the loop antenna is shown in fig. 33. When constructing antennas, it is necessary to ensure that the length of L can be reasonable, and the length of L/4 is responsible for maintaining the strength of the cable.

Figure 33. Circularly polarized loop antenna

To increase the strength coefficient of the qiu antenna, it is possible to victorize at once with a frame reflector and a director. The frame needs to be lived only through a symmetrical attachment. The simplest sizing attachment is shown in fig. 34.

Figure 34. The simplest sizing attachment

Industrial antennas for the range of 145 MHz

At this time, you can find a great selection of branded antennas for the 145 MHz band for sale. For the obviousness of pennies, obviously, you can buy a couple of antennas. Slid vrahuvati, scho should be bathed tsіlіsnі antennas, yakі vzhe nalashtanovanі on the range of 145 MHz. The antenna is to blame for the mother's protection, which protects against corrosion with acidic woods, which can fall into the current place. Telescopic antennas in the minds of the exploitation of the place are not necessary and can get out of hand from time to time.

When selecting antennas, it is necessary to carefully trim all the entries in the instructions for selection, and do not blow the silicone oil for waterproofing roses, telescopic connections and screw connections at narrow extensions.

Literature

1. I. Grigorov (RK3ZK). Uzgodzhuvalni pristroi 144 MHz band//Radio amateur. KV and UKKh.-1997.-No. 12.-P.29.
2. Barry Bootle. (W9YCW) Hairpin Match for Collinear - Coaxial Arrau//QST.-1984.-October.-P.39.
3. Doug DeMaw (W1FB) Build Your Own 5/8-Wave Antenna for 146 MHz//QST.-1979.-June.-P.15-16.
4. S. Bunin. Antenna for calling through ShSZ // Radio.- 1985.- No. 12.-S. twenty.
5. D.S.Robertson, VK5RN “Quadraquad” – Circular Polarization the Easy Way //QST.-April.-1984.-pages16-18.

Depending on Volodymyr's power supply, there are antennas at the guest's book, I, unfortunately, can no longer please vibrati. Everything was fine before me .... :-) Here is an option that supports the given purpose: it is simpler and more efficient.
http://www.cqham.ru/forum/showthread.php?t=7925. If you install it on a swivel bearing on a balcony (otherwise, in another accessible place where an important control can reach), you need a really efficient antenna system.
The axis here is the whole archive of antennas from RZ9CJ http://qrz-e.ru/forum/30-119-1 clave. Choose be it a design from another archive, pracyuvatime. It would be less accurate to follow the author's statements. Don't get embarrassed because you can't see it at once. Try again. And we all know that the Misholovtsi has no costly sir, but the simplest and most effective is more like a fairy tale. Whether it's for a guy to have a chance to compromise: it's either simpler or more effective. In parts. Qi (proponated more) antennas are of little importance for antennas of "manual drive".

Rich is good, she has proven herself to be good, but when making calls (or when trying to make a call), we definitely felt that we could wind up such an antenna exactly in the direction of the satellite and not collapse in a flash, then it’s zamirannya, otherwise, as they seem to be professionals, faddingi, kindly twist us like a call. And if the correspondent is a little narrower, if not, for example, it’s possible not through FM ECHO (AT-51), but through the transponder AO-7 or FO-29, which is close to fly, then the call can go into the category of gri "Guess- ka positive". On the right, in the fact that the satellites are spinning.

Not forwarded. Vidpovidno be-like an antenna, navit omnidirectional air, may be at least viprominuvannya. Plus to everything, the signals of the UKH and more VKV power, the cream of the greatest fading, and the turn of the polarization. Well, about polarization, I agree, it’s not necessary to explain in particular - prependicular one for one electric and magnetic curves orientation of another earth. For example, although it is perpendicular to the earth, it is electrical, and magnetic, apparently parallel, then the polarization is vertical and reverse. The best option is if both transmitting and receiving antennas have the same polarization (highlight less great fahivtsі, I write for amateurs), for example, from both sides of the GP, or GP and squares from the vertical polarization of the Earth, or from both sides of the Yagi elements are perpendicular to. d. Alternately, in these vipads it is fallow in the middle of the country, through the yaks the radio waves pass (the station of the ionosphere, for example, the sleepy wind, the atmosphere, for example, the board is strong gloominess) polarization wraps around the earth and how we stand on it.

In the minds, the radioobomin is in -low signals, shortly weak Nastilka, the fifth of the descriptions of descriptions of described by an hour of the stench disappeared, the yakshcho we are not at the same time to the snake polarizae, Matimo of the Perevagi before The physical sensation is that in the same space two identical antennas are deployed, rotated one by 90 degrees - one is vertically polarized, the other is horizontal, it’s better to lay the antenna in that way. Xi. Folding is only in the fact that it is required to rotate the phase of the modified (or received) signal by 90 degrees. Well, of course, do not forget about those that we need to take everything in one bottle - tobto. Rosem. Getting ahead of myself, I’ll say that it’s better than a mother to have two antennas, and even in an apartment, it’s necessary to combine them on one cable for an additional duplexer. This is why you don’t have a serious transiver with two independent bands, but a great manual "walking-bolt". Ale early chi pizno you will appreciate the independent antennas. :-) I do not wisely slyly prop your two antennas to a manual drive on 144 and 430 MHz, as if being selected on one traverse, fold the structure, which will guess a new yalinka. Many people sang about the design of transformers. That I am not a ghost - obviously I6IBE. Instead of a rose, it is necessary to connect a 50-ohm cable, no matter how long.

On the little 1 you can see that after the rose there is a coaxial transformer with a quarter-width winding, which simply uses an opir cable in the opir of two parallel-connected double-width dipoles-vibrators (you can see in the little one that there are more reflectors), then. transformer 1:2, vіrnishe 2:1. Dali one antenna is powered by a quarter-width wind, and the other is powered by a double-width, which leads to a turn of the phase of the viprominuvanny (received) signal by 90 degrees. I all. Tobto I will win by strength, I can’t have a pair with a two-element Yagoa, but now we all have the same way to “spin” the polarization of the signal. We її not visibly. Our cosmic version has a great plus. On the other little one, they are the same with rozmirami for 435 MHz. Antennas are better vicoristovuvaty okremo (it is possible on one traverse, but on the other side of the station one other way. I especially care that two cables are a big deal, if you want to vikoristovuvat duplexer. mothers zv'yazok - you need to try, but you are satisfied with the last result of that.

Again, let's move on to the practical part. It is known that a wooden beam with a side of 30-40 mm and a length of not less than 220 mm, in front of it, it is possible to spread it with some kind of varnish or a warehouse, which protects it from the vіd of water and gives it a trace of drying. It’s more important - we need the best possible dielectric :-) We gave you contact maidanchiki, in the way of screwing the elements themselves, and the ends of the cables for the self-tightening, yakі є one hour and fastening elements. Tsі maidanchiki need to be prepared from the same material as the elements themselves, moreover, their tovshchina is critical: they have a sufficient supply of militancy due to screw up the elements, especially the range of 144 MHz. You can change the design with galvanized locknuts. Transformers-phase wrappers are attracted to the traverse with plastic clamps-puffs or simply with electrical tape. Between two antennas, you can become no less than 50 cm. Better more. Obviously, as the antennas are made absolutely independent, every part is skipped for incompetence. But then again, you need to rotate them synchronously. Alemy of specialty dosvid podkazuє so. To build up such uneasy antennas, to lay a great line on the links is not a trace: after all, there are only 2 elements. In such a rank, we are allowed to call, if the companion is passing over us. Tobto. at the zenith. And chi varto turn the antennas?

The clue is obvious. Therefore, the antennas are mounted on one traverse and installed vertically. It is not necessary to go out like this "yalinka", it is not necessary to wrap the yak. The angle of straightness diagrams for two-element antennas is not higher than 70 degrees in both planes, so we take the "shelling" zone to the limit. The gain coefficient of such an antenna will not be affected by the sig- nificant 2-element yag, but the reception (winning) at the circular polarization will be even stronger (and receptive) by the standard variant. Qiu "yalinka" can be elementarily lifted above the ground either by hand, so that the timber can be taken not 2.2 meters, but skids can be reached. Abo just pull up the yogo, turning the lower part of the boom onto the choglu. In a word, the antenna is a confirmation of the adjective "need for guessing is cunning." Well, why do the people seem to say "out of faeces tsukerku". :-) It is quite obvious that this light antenna can be wrapped in such a configuration and divided into two okremi antennas. It will be possible to get only a cross-section along the edges of which two okrem antennas will be installed. As if everything is given to you, let's put it together - hurry up with the help of the cob of the stati. Tse all the same will be shorter, lower GP. Viber is yours.