You will need
- - thick antenna wire;
- - metal plate;
- - copper wire;
- - soldering iron;
- - the range;
- - drill;
- - the cap from the hairspray.
Bend the wire: it should have two squares with sides 53 mm. Then pull a few of these squares into rhombuses, two angles should be equal to 120 degrees.
Smoothen the prepared wire (after the wire is put on the connector, its protected part should be half inch). Then to the body of the connector, solder the wire: should be "fork".
Solder a "plug" to the frame of the antenna. However, to increase the power of a homemade antenna for 3g modem this device should be fitted to the reflector. As the reflector can be used a metal plate made of a PCB or of plywood, wrapped in foil.
The reflector should be the following sizes: 120 to 135 mm. Make the layout of the metal plate and trim it. Drill a hole in the middle of the reflector: the hole diameter should be equal to the thickness used in the construction of the wire.
The distance between antenna and reflector must be exactly 36 millimeters. In this case, perfectly fit cap from hair spray: make it groove, insert the wire and lock it.
To make your design has not collapsed, all the joints treated with a silicone. Then the Central wire wrap a 3g modem (make four or five turns), and the second put the foil. After collect the homemade antenna, find a place where the best signal, and set there his invention.
Observe pinpoint accuracy, making the markup of the parts of a homemade antenna!
When you purchase a 3g modem, pay attention to whether the device socket for the antenna. If the nest is not, then it is recommended to contact service center to solder to the inside antenna adapter for a homemade external antenna.