Antenna for a 3G modem do it yourself: scheme
It is not necessary to buy an antenna on the market from a modem. Making it yourself is quite simple. However, it should be borne in mind that the vibrators differ greatly in shape. If we consider the most simple modifications, they are made of metal cans. In turn, antennas with a frequency of more than 500 Hz require the installation of a vibrator. To understand this issue in detail, it is necessary to consider some types of models and study their designs.
Model from the can
An antenna for a 3G modem is being made from a beer can quite simply. First of all, to enhance the signal, an operational type amplifier is selected, which can be purchased at any radio equipment store. Directly in the bank for him to make a hole. In this case, the cover for the work is not required. Cable for this purpose can be used coaxial type. However, high-capacity diffusers are used for better signal transmission.They can also significantly increase the frequency of the device. To install the diffuser to the antenna, you can use a blowtorch. Another antenna for a 3G modem with their own hands from a can can be made with the participation of the regulator.
Copper Winding Antenna
Going with a copper winding antenna for a 3G modem do-it-yourself at home is not very easy. To this end, the vibrator is selected rectangular shape. At the same time its side racks should be bent. All this is necessary in order to better capture the signal. Directly center pin must be installed on the plate. To this end, it should make a small hole. After that, a soldering lamp is used to fix the pin.
The winding in this case should be located on the lower mast. At this stage, the wire need to prepare quite a lot. Direct signal transmission must be carried out through a diffuser. It is installed, as a rule, with a beam transistor. Antenna connection is important to perform only through the expander. It is mainly sold in stores with copper contacts. To fix the antenna on the roof or wall, it is important to purchase metal dowels. It is also required to weld the support at the mast base.
Aluminum mast device
This type of antenna is made for a 3G modem with your own hands (the photo is shown below) rather quickly. If we consider the modification at 400 Hz, then the length of the vibrator should be no more than 40 cm. In this case, the height of the rack depends on the thickness of the plate. On average, it is 50 cm in size. The vibrator can be installed using a welding machine. However, before this side racks must be given the desired shape. To this end, will have to use the machine. After fixing the supports, you can go directly to the diffuser. To this end, the beam transistor is primarily harvested. Further, it is important to connect an antenna using an analog converter. However, it should be understood that the racks should be fixed rather rigidly. In this case, it is necessary to provide for severe weather conditions.
Use of aluminum racks
It is done with aluminum racks antenna for a 3G modem with your own hands (the diagram is shown below) using a vibrator. For these purposes, it is better to pick up the steel type. Next, you need to install the diffuser directly. In order to change the frequency of the antenna, many experts recommend installing high-power modulators. Mount them is important at the front of the rack.Use electrical tape to hide the wires.
In the process of assembling the vibrator, special attention should be paid to the side racks. As a rule, they are installed at a slight angle. All this is necessary for better signal acceptance. It should also be borne in mind that the basics for the antenna can be made from both steel and aluminum plates. Directly connecting the model can be carried out through digital converters. Find them in the store can be two and three contacts. In this case, it is better to stay on the first option.
300 Hz Antenna CDMA Series
Going on a 300 Hz antenna for a 3G modem do it yourself CDMA differently. In this case, much depends on the shape of the vibrator. If you fold it rectangular type without side racks, the diffuser can be selected low sensitivity. Directly assembly model should start with the installation of the mast. At the first stage, a metal plate is attached to it. Next, it is necessary to make four holes in the corners. For this purpose, you can use the drill. Further it will be necessary only to fix the central pin by welding.In this case, the front part of the vibrator should be at a slight angle. It is important to connect the conductors directly to the converter. It in turn is often installed on the back of the vibrator.
400 Hz model
The antenna of a 3G modem is built up at 400 Hz with the help of a powerful diffuser. Today modifications with modulators are in great demand. As a rule, they are sold multichannel. For their normal operation, additional capacitors are required. It is important to install them on the vibrator. Directly plate soldered in the first place. Next, the conductors are attached to connect to the modem. Only then will it be possible to install a diffuser. At the end of the work will remain to make a winding and fix the base of the antenna.
500 Hz Antenna Device
An antenna for a 3G modem with its own hands can be made on 500 Hz in different ways. In this case, much depends on the type of vibrator. Also consider the parameters of the diffuser. If we consider the simplest model, then it is more expedient to choose a vibrator of a rectangular shape.In this case, the diffuser should have a low sensitivity. For this, the thickness of the metal should not exceed 1.2 mm. Side stops can be fixed to the antenna with a blowtorch. In this case, the converter is mounted on the back of the panel.
For this purpose it is necessary to make a hole in it. Only then is the feedthrough capacitor installed. All contacts must be isolated, otherwise the closure will occur quite often. Also note that the converter must be fixed rigidly. In some cases, it is installed with a spreader. In such a situation, the frequency of the model can be changed using a modulator. However, making an antenna of this type is rather difficult.
Modifications with feeder
This type of antenna is made for a 3G modem with your own hands using a vibrator. It is necessary to install only a rectangular shape. In this case, the rack for him are made of aluminum. In this case, the feeder is installed on the plate. In this case, the central part should have a length of about 2.4 cm. In this situation, the side racks are selected with a small thickness.
Transistors for accepting a signal, as a rule, are used of the radial type. On average, the frequency of such an antenna varies around 400 Hz. Additionally, it should be noted that the modulators for the model are suitable only for broadband. In turn, the converters are used a variety of. If we consider a model with a regulator, then it is more expedient to select a modulator of the analog type. For this purpose, two holes are made on the plate that will be needed to fix the device. However, before this it is important to fix the diffuser directly. The next step is to install the conductors for the connection.
Devices with a double central residential
Going this type of antenna for a 3G modem do-it-yourself is quite simple. First of all it is important to prepare a plate for the model. For this, steel sheets of small thickness are used. It is also necessary to prepare in advance racks that will be installed on the sides. In this case, they can be quite successfully replaced by ordinary iron cans. Fix them to the panel with screws.
The most common is considered to be modifications with two banks.However, if you need a low-frequency model, then one is enough. Diffusers in this case are selected with a regulator. However, modulators need to be installed first. Directly contacts should be mounted on the back of the rack. The minimum length of the vibrator should be 25 cm. At the same time, the central conductor must withstand the load from the capacitor.
Braided vertical polarization model
This type of antenna is made for a 3G modem by hand with a mast blank. For this, metal sheets are most often used from aluminum alloy. Additionally, for the normal operation of the device will require a quality diffuser. On average, its frequency must be in the region of 300 Hz. However, in this case, much depends on the conductivity of the resistors. Installing them is important on the back panel. For this purpose, an additional plate is attached at a given location.
Before this, the surface is carefully cleaned with sandpaper. Only after that you can proceed directly to the sheath. For this wire will need a small diameter. To facilitate the work, you can use pliers.The next step is to mount the transducer. Pick it up, as I rule, for two contacts. However, there are many more complex modifications on the market that are quite expensive. In this case, it is more expedient to install a simple model in order to save money.
Vertical polarization device without braid
Assembling an antenna of this type can be quite simple if you prepare a diffuser for it in advance. If we consider a modification at 400 Hz, then it should be selected exclusively cyclical. In this case, the conductivity of the device will depend on the power of the capacitors. At the same time, the converters are often mounted of the continuous type In order to assemble a model, it is first of all important to do a vibrator.
For this purpose, small sheets of metal are prepared as standard. Only after that you can proceed to the side pores. For this purpose, only aluminum rods are used. You can bend them yourself using a machine. In turn, the central core is mounted only after the diffuser. Then you can attach a modulator to the antenna to change the frequency. The next step is to mount the regulator directly.In order to connect the antenna to the modem, you need to solder the unit with the contacts.