In order to increase the effective use of the antenna for the USB modem, it is equipped with a reflector - a steel plate. It can be made of foil-coated PCB. The distance between the antenna and the reflector should be 36 millimeters. In order to create a distance between the antenna and the reflector, you can use some kind of cap or box.
The 4g signal amplifier for the modem has certain device features. Any steel plate can work in the form of a screen. Such a screen can be cut with scissors directly from tin or from an outdated aluminum pan using a grinder, or even made of a piece of plywood or cardboard material and pasted over using foil. There won't be much difference. If only he blocked the obstacles that are coming. Experts advise using some kind of DVD disc for the antenna. Its one side is wrapped in aluminum foil and copes well with wave reflection. In addition, it looks beautiful and contributes to a significant simplification of work. You just need to spread it with glue and fix the plastic bottle caps at the end, adjust the distance of the vibrator from the amplifier by adding additional washers or cutting off excess thickening.
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Experts advise making a Kharchenko antenna from a wire made of copper. Its cross-section should be 5 mm. sq. or be with a diameter of 2.5 millimeters. It should be noted right away that you can take a thickening of 2.3 millimeters (the cross-section is 4 mm sq), which will not significantly reduce the reception parameters. It is also permissible to carry out an installation with a cross section of 2.5 mm sq, but this will lead to a deterioration of the signal, increasing its attenuation. However, for a certain area this is quite acceptable.
The high frequency cable must be soldered to the antenna. But here a problem in the form of a braid may appear. Many cheap cables cannot be soldered using rosin. You can solve this problem if you use a simple F-connector, screwing it over the cable. A piece of copper wire should be soldered to it, and the entire structure directly to the antenna.
Users often have a question, which cable should be used to get a 4G panel antenna? The main difference that you can face is the size of the characteristic impedance, which can be fifty or seventy-five ohms. To reduce power loss, it is better to use a cable with a lower resistance.It is better suited for electrical performance, better guarantees the lowest signal loss. But using one of these types of cable, it is better to more accurately make the mechanical dimensions of the vibrator for it. In this case, the signal power loss will be the smallest.
The resulting structure must be securely fixed using hot melt glue. After that, it remains to connect the antenna to the modem and tune to the maximum signal level. If the modem is not equipped with a connector for an external antenna, then you should simply make three to four turns of the main conductor around the USB modem.
THIS REPAIR SHOULD BE CARRIED OUT ONLY BY PROPERTIES WITH THE PROPER QUALIFICATION AND TOOL! ANY ATTEMPTS OF UNQUALIFIED INTERVENTION THREATS A LOSS OF WARRANTY, REMOVAL FROM THE EQUIPMENT, DAMAGE TO THE MAIN BOARD AND OTHER NON-POSSIBILITIES! Likewise, the AUTHOR DOES NOT BE RESPONSIBLE FOR UNQUALIFIED REPAIRS OR ANY OTHER INTERVENTION! THIS ARTICLE IS NOT A GUIDE TO REPAIR EQUIPMENT AND ONLY SHOWS THE QUALIFICATION OF A SEPARATE MASTER!
Not so long ago we bought a 4g modem from Altel because one of our engineers needed such a thing for domestic use.
We bought it not working at first, it did not turn on then after the charging procedure with a normal cable, it nevertheless turned on.
The modem said that you need a SIM card. We put a SIM card but the modem did not see it either. I decided to look inside the device.
We move aside the back cover of the device.
ATTENTION BEFORE BEGINNING TO REMOVE THE COVER, YOU MUST REMOVE THE BOLT FROM THE SIDE ON THE CASE UNDER THE CAP WITHOUT THIS YOU WILL RUN OUT THE COVER.
I did not have this bolt because I am sure that I am not the first to disassemble it.
I removed the cover and the battery and the housing bolts appeared before us.
Gently pulling out the battery, it is firmly glued to the double-sided tape.
to the side of the case, therefore, do not overdo it and not break the case or battery.
After this procedure, as elsewhere, the bolts are unscrewed.
I take everything out of the case (in this case, everything just spills out on the table since the modem is in a terrible state)
Initial examination showed a suspicious absence of contacts on the SIM card slot.
He warmed it up with a hairdryer and after a few seconds the lid gave in.
I open the lid and we see 2 bent and one missing contacts.
That is why he did not read the SIM card. We did not have such a connector in the service.
therefore it was postponed until better times when we find such a connector.
THIS REPAIR SHOULD BE CARRIED OUT ONLY BY PROPERTIES WITH THE PROPER QUALIFICATION AND TOOL! ANY ATTEMPTS OF UNQUALIFIED INTERVENTION THREATS A LOSS OF WARRANTY, REMOVAL FROM THE EQUIPMENT, DAMAGE TO THE MAIN BOARD AND OTHER NON-POSSIBILITIES! Likewise, the AUTHOR DOES NOT BE RESPONSIBLE FOR UNQUALIFIED REPAIRS OR ANY OTHER INTERVENTION! THIS ARTICLE IS NOT A GUIDE TO REPAIR EQUIPMENT AND ONLY SHOWS THE QUALIFICATION OF A SEPARATE MASTER!
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At the moment when I wrote comments on the articles of the Mozhochin, I literally lost the Internet in mid-sentence. First of all, I went to look at the modem, where I found out that it was finished - not a single LED was on. After thinking a little, it was decided that there was nothing to lose (the guarantee was over long ago), and the autopsy no longer scares me.
This article is more of a success than a natural victory over a breakdown, but still. I am a person a little distant from delicate electronics, but I can distinguish a burnt look. Therefore, having disassembled this device
the following picture was presented to the light white:
After careful sniffing and inspection, the gaze settled on this condenser.
Its shape changed markedly, although there was no gap. The marking informs that its capacity is 3300μF and voltage is 16V. Since I don't have an LC meter, I continued examining it with a multimeter and measuring its resistance. So it interested me.The charge was taken very reluctantly, and the increase in resistance quickly stopped.
After that, two Soviet capacitors, with a total capacity of almost half of the original, were pulled out of some frames.
After connecting one capacitor in parallel, the power LED showed signs of life, which meant the correct course of my thoughts. Having soldered the second one, I tried to turn on the modem - and, lo and behold, the Internet started working! Therefore, I can write this article! 🙂
Now it remains to spend $ 0.5 to buy the original capacitor, and 10 minutes of time to assemble everything in a bunch! Of course, this is not a detailed analysis of the modem repair, but still a description of one of its breakdowns. So if someone comes in handy - I'll be glad! :)
After purchasing a powerful soldering iron, I decided to continue the repair. Armed with a new unit, I still managed to pull out this evil condenser.
In its place, a capacitor found at work, although inferior in capacity, was hoisted.
After that, the modem blinked merrily with LEDs.
And he briskly sent a bunch of information packets through the wires. :)
We fill the niche part 3 or make a chest of drawers out of garbage with our own hands - 12/20/2014
Filling a niche part 2 or making corner shelves with our own hands from garbage - 12/19/2014
Filling a niche part 1 or making shelves with our own hands from garbage - 12/19/2014
The idea of decorating a repaired wire with your own hands - 09/30/2014
DIY plywood box - 09/22/2014
Do-it-yourself drawing on T-shirts - 09/15/2014
Do-it-yourself sealed container for welding electrodes - 09/02/2014
DIY assembly on dowels or thorns - 07/27/2014
Cabinet and shelves as an idea for filling a niche - 07/25/2014
Do-it-yourself folding table-cabinet - 07/15/2014
Making a universal playing board with our own hands - 07/05/2014
We clean jeans from spilled PF-115 paint with our own hands - 07/01/2014
Do-it-yourself Eurobook sofa cover - 01/07/2014
Convenient case for a multimeter with your own hands - 12/26/2013
DIY winter mask - 12/20/2013
It is important to add that when installing the Conder it does not overheat it, and also does not confuse the polarity (if you confuse it, when you turn it on, there will be "pshshshshsh" and swelling of the freshly soldered Conder).
Absolutely fair! Pay attention to the color coding. In general, I try to take pictures first. Well, and the popovod of overheating, you also need to be careful.
why is the quality of photos so bad
Because they were done in poor lighting. And everything is clear to such pictures, so I see no reason for indignation.
And also due to the fact that the camera was not at hand, and the only thing that was at hand was a phone 🙂 and that Samsun, bought for work.
Dried or swollen electrolytes sometimes drag other parts on the boards with them. So replacing capacitors doesn't always help.
Comrades! Thank you for your help! Based on your advice, I still managed to bring my modem to a human form, and finish writing an article!
This is a solder with a high content of lead, if you do not have a powerful soldering iron at hand, then I use a turbo lighter
Usually - take a more powerful soldering iron.
I got a new soldering iron today. Let's see what happens!
Guys! Guard! I can’t evaporate this ill-fated capacitor! Help with advice! I warm him - but he is not in any! I already coated it with solder so that the heat transfer was better, and still does not want to! What do you do?
Sorry for my "correctness", I just want to earn M $ 🙂
Everything is fine! We must strive for excellence! :)
And also in the sentence "After which two Soviet capacitors were pulled out of some frames, with a TOTAL capacity of almost half of the original" there is an error in the word SUMMARY.
In the sentence "After the PARALLEL connection of one capacitor, the power LED applied to the PICTURES of life" there are errors in the words PARALLEL and SIGNS!
good day, 70% of all computer breakdowns (motherboards, power supplies and video cards) that I encountered were just such a breakdown, drying out or swelling of an electrolytic capacitor, it happens that the kander did not swell and there is a sticky puddle on the board where it is soldered or the appearance of a fat spot is also a factor in the failure of the latter, and I rarely use the LC_meter, basically I check them in the same way as the author, I solder them and alternately change the polarity of the instrument probes with a multimeter,
Cool) Mozgochin will not be left without an Internet or even electricity. There is always a way)
P.S. 70% is a lot. You can open a workshop knowing this
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Is your TV, radio, mobile phone or kettle broken? And you want to create a new topic about this in this forum?
First of all, think about this: imagine that your father / son / brother has an appendicitis pain and you know from the symptoms that it is just appendicitis, but there is no experience of cutting it out, as well as the tool. And you turn on your computer, access the Internet on a medical site with the question: "Help to cut out appendicitis." Do you understand the absurdity of the whole situation? Even if they answer you, it is worth considering factors such as the patient's diabetes, allergies to anesthesia and other medical nuances. I think no one does this in real life and will risk trusting the life of their loved ones with advice from the Internet.
The same is in the repair of radio equipment, although of course these are all the material benefits of modern civilization and in case of unsuccessful repairs, you can always buy a new LCD TV, cell phone, iPAD or computer. And for the repair of such equipment, at least it is necessary to have the appropriate measuring (oscilloscope, multimeter, generator, etc.) and soldering equipment (hair dryer, SMD-hot tweezers, etc.), a schematic diagram, not to mention the necessary knowledge and repair experience.
Let's consider a situation if you are a beginner / advanced radio amateur soldering all sorts of electronic gizmos and having some of the necessary tools. You create an appropriate thread on the repair forum with a short description of “patient symptoms”, ie. for example “Samsung LE40R81B TV does not turn on”. So what? Yes, there can be a lot of reasons for not switching on - from malfunctions in the power system, problems with the processor or flashing firmware in the EEPROM memory.
The purpose of this post is not any PR of repair shops, but I want to convey to you that sometimes self-repair can be more expensive than taking it to a professional workshop. Although, of course, this is your money and what is better or more risky is up to you.
If you nevertheless decide that you are able to repair the radio equipment on your own, then when creating a post, be sure to indicate the full name of the device, modification, year of manufacture, country of origin and other detailed information. If there is a diagram, then attach it to the post or give a link to the source. Write down how long the symptoms have been manifesting, whether there were surges in the supply voltage network, whether there was a repair before that, what was done, what was checked, voltage measurements, oscillograms, etc. From a photo of a motherboard, as a rule, there is little sense, from a photo of a motherboard taken on a mobile phone there is no sense at all. Telepaths live in other forums.
The format of your post should be as follows:
Topics with the title “Help fix the Sony TV” with the content “broken” and a couple of blurred photos of the unscrewed back cover, taken with the 7th iPhone, at night, with a resolution of 8000x6000 pixels are immediately deleted. The more information you post about the breakdown, the more chances you will get a competent answer.Understand that the forum is a system of gratuitous mutual assistance for solving problems and if you are dismissive of writing your post and do not follow the above tips, then the answers to it will be appropriate, if anyone wants to answer at all. Also keep in mind that no one should answer instantly or during, say, a day, no need to write after 2 hours “That no one can help”, etc. In this case, the topic will be deleted immediately.
If you decide to take your broken equipment to the nearest workshop, but do not know where, then perhaps our online cartographic service will help you: workshops on the map (on the left, press all buttons except “Workshops”). You can leave and view user reviews for workshops.
For repairmen and workshops: you can add your services to the map. Find your object on the map from the satellite and click on it with the left mouse button. In the field “Object type:” do not forget to change to “Equipment repair”. Adding is absolutely free! All objects are checked and moderated. A discussion of the service is here.
Typically, in the elementary school curriculum, children are taught to first find the root of a word. However, this approach is incorrect, as it leads to possible errors in the search for morphemes in a word. The sequence of actions should be as follows:
1. Determine the part of speech to which the word belongs. It is important to do this right away. For example, if the token is immutable, there will be no ending. Also, do not be lazy to remember the features of the formation of this type of tokens.
2. Next, find the ending. To do this, you need to select the maximum number of options with different endings, and then graphically highlight the ending.
3. Mark the existing suffixes and postfixes, which are always preceded by the ending. Do not forget that the same parts of speech are often formed according to the same model and have the same formative suffixes, of which there can be more than two.
4. If you have followed the two previous steps correctly, then determining the stem of a word will not be difficult. Select the base graphically, highlighting all the words except the ending, since this mass is not included in the base.
5. Designate graphically the prefix (prefixes) of the lexeme. For the purpose of self-control, try to choose several variants of lexemes of the same part of speech with the same prefixes.
6. The last stage is the selection of the root of the word. Note that complex tokens can have two roots. In this case, do not forget to graphically indicate the connecting vowel.
How to repair USB Yota modem?
Manufacturers of Yota modems, and many users also argue that this USB modem cannot fail in principle - simply because there is nothing to break there. Nevertheless, practice sometimes refutes this point of view. So if the owner, for example, uses the modem in the car, then the modem can escape from any almost inattentive gesture. Result: By itself is a USB connector, and the modem is by itself. The situation is not the most pleasant, agree?
If to a lesser or greater extent in technical you understand the wisdom, then you can try to repair the Yota modem with your own hands. To describe the process in short, let's say that it consists of a disassembly modem, soldering the necessary elements and assembling all the parts in place. The USB modem should be disassembled very carefully, taking into account the location of the components of the "vital" device. To get to the loop, we slightly press on the modem cover from the back side (where the Yota icon is) and move it towards the USB connector. A plastic plate is fixed on the latches under the lid, which must also be removed. Next, we need to unscrew the pressure plate that secures the USB connector housing. We remove the board and the printed circuit board from the case with the details of the modem.Disconnect the USB cable from the board. We take out the case of the USB connector, turn the modem itself perpendicularly and carefully squeeze the USB case out of the modem. Next comes the case for disassembling the USB connector, which must be carefully opened along the seam.
In the process of soldering, you need to solder the wiring from the USB case to the corresponding places on the modem board. It is better to do this with a small soldering iron and using a magnifying glass. We check this way: install the ribbon cable into the modem board, and the connector into the computer's USB port.
Before assembling, it is imperative to fix the USB connector in the case: this can be done with glue (the option is not the most effective), but it is better to unbend a paper clip, make a hole with a soldering iron in one of the halves of the USB connector and install a paper clip instead of the factory rod. Then you can put back the modem and the case.
True, with the absence of the appropriate devices, and even more so, the dexterity and abilities, it is better not to tackle the repair of an independent USB modem. You can always contact a service center at least inexpensive, where they will do everything for you as it should be. Otherwise, you risk "killing" your modem completely, and without the possibility of returning it under warranty or exchanging it.
You can ask questions only after registration. Login or register, please.
Greetings to members of the forum. I decided to publish the idea of my homemade receiving 3G antenna, ideas were collected from all over the world, with their own modifications. The search for the optimal result lasted 1.5 years from the usual antenna from the "heater" to the last working version. I will make a reservation in advance, all measurements of the signal strength were measured in dB. If the signal is 0 for 3G, then it is -113 dB, and the weak measurement of the Huawei E1550 modem in 1 stick of division is 99-95 dB. At 95 dB, the download speed is sufficient for watching online videos from YouTube.
Next, we take a soldering iron, a copper core from 1.5 - 2.5 mm, in the store we purchase a can of canned food, as an option, some other reflector, we take a 75 Ohm cable with copper braid and a central core, a copper tube, it is difficult to pass through the tube 75 Ohm cable, if you remove the insulation, then the tube easily enters the cable. We solder.
We get what is in the picture. There is already a ready-made version. I painted it a little from oxidation, oxidation reduces the signal and the efficiency of the antenna. If you need more details, I will also make an antenna at my leisure, I will take a more detailed photo.
Further.
Antenna presets. The antenna was tilted 26.5 degrees. the calculations are to be viewed from the antenna offset angle data. Took the data and description from here
Description
And I will also add links to an interesting version of the antenna Panel 3G antenna 16 dBi
Video (click to play).
P. s. Who needs real help to help, please contact.
