You finally decided to enter the world of Wi-Fi in the promise of the router you bought is clear: "wireless internet throughout the house." You plug the device, following the recommendations of the manual - who would say, you really read the manual! - And use the installation CD player.

All set, the network cable from the modem stuck and ready: now you have a wireless network. All excited leaves the house to see if the network gets everywhere. Notebook in hand, the sad fact: the sign of evil is the room where the router is installed. What went wrong?

You cannot choose just one culprit. A number of factors negatively affecting the signal range of Wi-Fi From ordinary things and controllable, such as appliances and electronics, the more complicated factors, such as elevators and water pipes.

"I had so much headache that almost gave ...", to the computer technician Mario Vizcaya, 28. Even with a good knowledge of technology, he struggled to get to the sign of internet access throughout your home. "First, I bought a famous brand of router and to no avail. As the antenna higher power was too expensive, let him aside. Then I bought a cheaper and put a better antenna. I lost money, but the reception was great. "

The fault, in most cases, is not the equipment. The evil lie invariably on the interference that the signal suffers in its transmission.

"The sign of Wi-Fi is nothing more than the good old radio from Marconi, which transfers digital information at a frequency of 2.4 GHz," said Marcos Oliveira, 39, an IT analyst from IK1, a company that sells network solutions and connectivity technology. "Magnetic fields, electric, other routers, all this can generate unwanted interference."

For Mark, it is essential that, when found some connectivity problem, the User search out the best in your equipment. If all else fails, it suggests the help of a professional to avoid spending foolishly. "There are times that a simple change of the transmission channel router alleviates or solves the problem. It is important to read the manual for it, "he adds.

The disposition of the property where the router is also installed directly affected the performance of the network. "The arrangement of the walls and even stairs can form a true tunnel, which prevents the signal to go further explains Diogo Superbi, sales engineer at Cisco / Linksys, a maker of routers for consumers and businesses.

In such cases, he recommends the use of routers with the band No "They are better than the G band, it went further and offer improved speed in file transfer."

Enemies of the Wi-Fi

Walls - The density of the masonry walls, using bricks and cement, drastically reduces the power of radio waves. When the thickness is too large or there are a number of obstacles to overcome, the signal is simply not strong at a certain point, preventing the connection.

Water - One of the worst enemies of the electromagnetic signal of radio are large concentrations of water such as aquariums and water tanks. Water has the ability to attract the magnetic signal, acting as a barrier so dense as a solid wall of stone. Waterfalls in gardens also interfere with the signal.

Plumbing - pipes, both metal and PVC, are invisible enemies of the radio signal. Embedded in the walls, sometimes very close to the surface, they also act like a water hazard As this water is usually in motion, has attracted more signal.

Resistors - devices that generate heat using electricity, and showers and electric ovens, toasters, irons and hair flat iron, creating an aura of electromagnetic interference which is a byproduct of heat generation. This interference stops and gets to mess up the signal.

Elevator - In a pit made with very thick walls, the elevator has a number of electrical circuits. Wi-Fi. And the electromagnetic brakes - to help you stop right on the floor - added to the motor that opens the door is a nightmare if the lift is positioned in the middle of the path taken by the Wi-Fi signal

Electric Motors - In addition to naturally generate an interference on behalf of the movement that produce electric motors, even small, home appliances, work through a coil of wire that generates an impressive amount of static electromagnetic and disturbs the signal.

Electronic devices - wireless phones, walkie talkies, stereos, fluorescent lamp ballasts and even plasma TV or LCD generate different levels of interference, which when combined in the same environment, can prevent the spread of Wi-Fi adequate

Antennas - In a phenomenon that is similar to that experienced when it passes through an area saturated by satellite transmission as in Avenida Paulista, which hampers the reception of radio stations, the signal from Wi-Fi is badly damaged in the vicinity of antennas large, such as TV stations and mobile.

Other routers - Many people use the router with factory settings, which cause the saturation of a single transmission channel. Typically, the devices use channel 6. A simple change of configuration can greatly improve the signal quality in areas with many routers.