Many of us experience poor 3G reception. A homemade antenna for a 3G modem is one of the options for getting out of the situation. And it is not so important whether your device has a connector for it or not, because we will offer you a solution for such equipment, where it is, as well as for the one that does not have it.
The modem antenna is capable of amplifying a weak signal. Let's start with the easiest way to make it. A copper wire is taken and about three or four turns are made around your device. It is best to do them at the very tip, because there is a built-in receive antenna.
For the test, we took a modem that showed -107 decibels. When winding the copper wire, the indicator of the so-called "palcomer" increased, while the reception indicators increased to -101 decibels. This do-it-yourself antenna for a 3G modem requires clear action. After all, you yourself will have to select the length, thickness, as well as the number of turns of wire. For example, additional length or winding can both improve anddegrade signal reception quality.
Antenna for modem: option two. It is called a colander or a pan. All lovers of experiments, who are driven to despair by low access speed, invent various exotic designs in the image and likeness of a saucepan, screens, and satellite dishes. This option is slightly better than the previous one, however, such a modem antenna will require much more time.
It is worth noting that an extension cable is often included with the device. Its length, as a rule, is from three to five meters. At the end there is a small piece of double-sided tape, with which the modem is attached near the window or on the wall. Instructions are also provided by the device manufacturer. In action, such an antenna for a modem is similar to the wire version, which we considered at the very beginning.
The next method is the jar method. At first it was often used in WI-FI networks. Thanks to this method, the craftsmen were able to stretch these networks over a distance of several kilometers between access points. So, we take an empty tin can and make some simple calculations.
Here is an example of such a calculation. The diameter of the can (D) is one hundred millimeters. The wavelength Lo is equal to 143 millimeters, respectively, Lo/4 will be approximately 36 millimeters. The wavelength Lg is 261 millimeters and Lg/4 will be approximately 65 millimeters. Therefore, at a distance of 65 millimeters fromWe make a hole in the bottom of our jar in which we fix a standard nest. A waveguide is soldered to it, the length of which is 36 millimeters. It must be made of copper wire, the diameter of which is two millimeters.
Now a braided TV cable is taken, an antenna connector is attached to it, which is inserted into the jar, and on the other hand, a modem connector.
And if it doesn't have a connector? In this case, you can disassemble the device and find the measuring socket on the board itself. A shielded wire of small diameter is soldered to it. This will bring out the adapter to connect the antenna to it. But you need to do this very carefully so as not to lose the modem's warranty or completely disable it.
