But soon the waves are also represented a long-term threat to public health accused. The subject is complex and sensitive. Many studies conducted without a clear and definitive answer is given, 20 years after the first deployment of GSM networks. The uncertainty hp pavilion dv4 battery has led to many misconceptions, sometimes, sometimes based. We wanted to answer most common actions to support it, in partnership with the Centre for Research and Independent Information on non-ionizing electromagnetic radiation, the Criirem.

Waves: What are the boxes in question?

The answer to this question depends largely on the donor, but just remember, regulatory standards currently in France. The intensity of electromagnetic fields is widespread in volts per meter (V / m) terms. Decree 2002-775 of May 3, 2002 sets limits vary depending on the frequency used: 41 V / m for GSM base stations to 900 MHz, 58 V / m for GSM 1800 MHz and 61 V / m for UMTS 2100 MHz antennas.

There are also limits for mobile phones and smartphones. Its transmit power (effective isotropic radiated power or EIRP) is limited to 2 W, and they must have a specific absorption rate (SAR) of 2 W / kg. This brings the energy that is absorbed by living organisms in watts per kilogram of tissue (W / kg). DECT phones with mobile phones, the SAR value of 2 W / kg limit divided.

WiFi Router, Sony VGP-BPS13/Q Battery Bluetooth headsets have a Wimax antenna also limits the transmission power. WiFi devices are 100 mW (2.4 GHz band) or 200 mW in the band 5 150-5 350 MHz and 1 W in the band 5470-5725 MHz limited. Bluetooth devices are divided into three classes. They emit less than 100 mW in a class, Class 2 and Class 3 less than 2.5 mW under 1 MW.

Do we live in the country?

Faced with what some electro, it may be tempting to move to the countryside, far from urban centers. Is this a good solution? To find out, we have these measures in two different places included. The first was in the immediate suburbs of Paris, Courbevoie elected in a densely populated urban area. The second was the opposite: a country house on the island (Breval), the first neighbor is farther than 100 m. Every place has a similar equipment: 4 mobile phones, at least one WiFi access point, one or more DECT phones, a UMTS femtocell. To understand, Sony VGP-BPL13 Battery have the effect of individual devices, we turned off and back at a time.

In rural areas, while the radio equipment was parked in the house of the electromagnetic field latent 0.37 V / m. The main factor was the digital terrestrial television (0.3 V / m), a transmitter, which can not act. There was also a small contribution from a distant antenna GSM (0.03 V / m) and the DECT phone to a neighbor distance (0.1 V / m).

In urban areas, the level of the overall picture ... 0.3 V / m. The absolute difference is rare, although we note that this base level was spread over a wider frequency range: FM-TV (0.1 V / m), 900 GSM (0.01 V / m), GSM 1800 (0.05 V / m), UMTS (0.04 V / m), Wi (0.02 V / m).

However, we must emphasize an important point: these measures are likely to vary considerably over time. For example, as we shall see, one fire nearby WiFi approach, or through its DECT communication so that the reception field strength increases in the apartment. This is evident in urban areas rather than countries.

Should we be cautious antennas?

We have seen that country life is not guaranteed to receive a reduced level of electromagnetic radiation. In truth, there may even be harmful.

Mobile networks get their name because they are cells, areas where power is generated by a base station set up. As mentioned Jean-Luc Vuillemin, production manager at Orange said network, each cell has a certain size, set during the installation of the antenna according to several parameters. Such a setting is the number of customers to serve. Each antenna is in fact identical performance and limited. In urban areas, the maximum number of HP Pavilion dv7 battery clients is achieved quickly by the high population density, the cell size may be relatively low (typically 350 to 400 m radius at Orange in Paris). In rural areas the size of a cell to be much wider (the GSM standard, a limit of 35 km radius for GSM cells 900). Or the cell, the greater the power radiated by the antenna to cover, it is important. At a distance equal to a base station, two houses will not be the same "dose" of waves, as DELL Latitude E6410 Battery they are in a large cell in the landscape or in a small cell in the city.

It may therefore want to leave most of the antennas. This is not necessarily a good idea. In fact, a mobile unit, the signal it emits, according to signal quality, it preserves the integrity of the connection must be maintained. If the network is stronger, you will hear: It creates a near field to the user much more intense than the base station. This is also illustrated by our measurements.

Put in our test areas of mobile networks are hardly mentioned: We did not find anything on the GSM or UMTS 1800 and GSM 900 ranged from 0 to 0.03 V / m. However, if the phone call, we found very high intensities in the GSM 900, in the range of 2.9 V / m. This value was obtained at about 2 m of phones. After Criirem, one can measure up to 50 V / m, if one is only 2 inches from a phone. The resulting burden on residents of rural households was then significantly higher than in our urban measurement site, where networks are always (but low) collected. This had little effect on cell firing: UMTS increased by 0.04 V / m at 0.1 V / m for GSM 1800 and 0.05 V / m at 0.08 V / m . Far most antennas is useful only if it is completely mobile.

If we turn on the WLAN?

WiFi technology for wireless networks is most often criticized. What is the field strength through a WiFi router that the DSL box, creating in so many households?

Our two test sites were different teams in WiFi. In the rural network (g WiFi 2.4 GHz) is created by a Livebox Pro and repeated to cover the entire house. The city has two networks of an Apple TimeCapsule (WiFi g / n, a 5 GHz, 2.4 GHz in the other) and create a third network is transmitted by a base station for Apple Airport Extreme (g WLAN , 2.4 GHz). The spectrometer who can not detect Criirem frequencies above 3 GHz, 5 GHz wireless-n was therefore ignored by our measures.

Despite a big difference in the Sony VGP-BPS13B/Q Battery configuration, we found the same intensity at each site: 0.3 V / m, clientless, 0.5 V / m with a maximum of active clients. It is six times smaller than the maximum of smart phones emit. It is measured very close to the baseline in the same places. Wi-Fi seems to be less concern than cellular networks. It is still unique in the vicinity of the frequency 2450 MHz, which is used by the microwave emission. This frequency is the most effective, leading to water molecules, heating and cooking to stir. For a given level of exposure, the effect of WiFi may be more important than the cellular network is established.

Can we turn off the wireless?

If you want to live without WiFi at home, we quickly come to that all Internet-box set of available operators confronted with WiFi enabled by default. Can we trust him completely off the field, the WiFi? Freebox V5 is known for: the box with a WiFi network, with the TV box, a network that still exists when the user "turns the WiFi" in the management interface to communicate freely. The Freebox following the CPL and are a priori the same problem. The BBox Freebox, SFR and box should also ensure that the WiFi hot spot or the Dell Latitude D630 Battery community, the second wireless network, disable the connection at any participating shares of the same operator. In our tests, we found that although the Livebox Pro completely destroyed his show, and the airport terminal and TimeCapsule.

However, the reduction of its WiFi-Box is not sufficient to protect yourself: You have to convince its neighbors. We have a wireless network at 0.02 V / m in our city instead of test well in all terminals were found in the apartment. This question will naturally be less inclined to enter the country, as more distant neighbors mechanically.

It must also ensure that other devices, the terminal box or WiFi. PDAs, game consoles, laptops continue to be issued to connect to a network if you do not try to turn off their wireless chip.

Is it better to call with your phone or DECT?

Probably provided by a reflex of the price of calls, we prefer to call on his cell phone to a smartphone. But the phone is mostly wireless, DECT. What is their level of emissions?

It is high or very high. In our measurements, we found between 0.7 V / m and 1.3 V / m for both DECT phones of our two tests. It is far superior to Wi-Fi networks, and only through the smartphones, when they are out of its mobile network surpassed the average. Worse still, the fundamentals of the issue of DECT phones generally continue, even if they are not in communication (cell phones, which emit Fortunately, communication)

Babyphone Example

According to our partners Criirem the hype on the development of DECT market if they had met the concerns of communication with analogue cordless phones address placed. You have therefore been developed to reach their (usually guaranteed to be 100 or 300 m) to maximize, not minimize their Sony VGP-BPS9/b Battery power. If you want to reduce your exposure to electromagnetic waves, it is best to avoid DECT. Fortunately, some manufacturers have optimized DECT, DECT sometimes called Eco expected to modulate its transmit power depending on the distance of the receiver and reduce the program, past or if no communication is established, the handset on the basis of life . The situation is similar to baby monitors and baby-phones, communication with DECT. Again, we seem to start optimized models.

Should we fear the femtocell?

Since late 2008, SFR is the first operator in France, to install its customers a femtocell at home. We have already had occasion, these mini-home-base-test (see test femtocell: improving the reception of cells). Its principle is a DSL Internet connection can share a 3G network, traditional local. The man in a white area then have a 3G connection at home or in their business. The objective of femtocells is the inhabitants of areas not covered, or only poorly by 3G.

There may be reluctant to install a base station within its walls, it "femto" was. However, our measurements show that the Sony VAIO VGN-FZ Battery power radiated by the antenna is very low. We installed in our country where the location of test 3G networks are completely absent in normal times. After turning on the femtocell, was the electric field in the 3G frequencies of 0.1 V / m, the lowest value we measured, far from a DECT phone (≈ 1 V / m) or a can WiFi (0.5 V / m). In addition, the reduced presence of femtocells, the transmitted power of mobile customers and have an excellent reception. Far from being a threat, can reduce the femtocell solution to the air of smog. These measures were pleasantly surprised Criirem technicians come to realize it. "My surprise at the pico-satellite, which seems quite reasonable," said Myriam Galbrun. "[This] confirms our vision, the less powerful antennas for mobile communication to increase." The Criirem effectively arguing for the dissemination of antennas, combined with a Toshiba PA3399U-1BAS battery reduction in the performance of each to improve coverage and minimize risk.

It would be as logical as the operator calls for a femtocell not made on the mobile operators charge for ADSL, but because it is through this context they occur.

And microwave?

Mobile phones are DECT and WiFi is not only the transmitter of electromagnetic fields commonly found in homes. The microwave is different. The operation is simple: the electromagnetic radiation generated at high power (depending on model, but about 1000 W) in the oven. This high energy causes movement of water molecules in the heating or desired doneness.

Of course, for the use of a microwave oven is safe, it is necessary that the radiation in the walls of the oven perfectly sealed remains limited. In fact, the door will always be filtered into Sony VGP-BPS12 Battery energy. These leaks are governed by standards in France, they should not 137 V / m at 5 cm from the oven. Leaks are usually much lower. Several studies cited by the Federal Office of Public Health show that the Swiss stoves typically emit less than 39 V / m. The measure is not on its side above the ovens Criirem 60 V / m. These values ​​are very high compared to what we have already discussed. The difference is simply due to the removal of special equipment. The received power decreases with the square of the distance, producing an action can be taken by an issuer in cm cm 100 times higher than the measured 50 of the transmitter 5. In order to minimize their exposure should away from his microwave.

The case of Wimax and Bluetooth

Other wireless communication technologies are one of the most common is the Bluetooth that we do not include in our measures. Such as WiFi, Bluetooth transmits in a frequency band from 2400 to 2480 MHz. But Bluetooth is a technology covered by the scope of their consumption or to minimize the rate. Most Bluetooth headsets are Class 2, meaning that their power is 2.5 mW and increased to 10 m. In comparison, limited WiFi dell studio xps 13 battery devices to 100 mW (2.4 GHz band) or a W in the band (5 GHz) and smartphones are limited to 2 W. The courts, however, is unique in that it as an insert in the Near the body, such as mobile phones. There are also Class 1 Bluetooth devices and offers a range of 100 m at a power output increased to 100 mW.

Wimax is the exact opposite of the Bluetooth technology: The technology must be capable of very long range (several kilometers), and flow rates sufficient for access to broadband Internet coverage. Wimax standards provide for different frequencies, but in France, a band is used by 3.5 GHz. Transmission power varies between 10 and 40 sites of the National Agency of Frequencies W, the performance is very similar to the antennas GSM/3G (between 20 and 60 W of Orange). In France, the Wimax carry a lot of hope for those living in areas such as "white" is not well covered by ADSL. But Toshiba PA3634U-1BAS battery technology has never really started. The small number of users defined, there were few studies on the potential impact of waves of 3.5 GHz.

How to minimize his involvement in the waves

The crucial question of the effect of electromagnetic waves on human health remains unresolved. However, the radio frequency have recently been as possibly carcinogenic by the sensitivity of the WHO and power seems classified as medically recognized. Therefore, it is legitimate to seek, if not totally boycott of Acer aspire one Zg5 wireless technology, at least to minimize its exposure. Since we have proven our measures, it is not easy, the technical reality sometimes goes against what defines common sense nearby.

Although cell phone towers to crystallize the fears that we need more issuers that we do all the time, almost. In fact, in our series of measures, the electromagnetic field around the sharp phones themselves, when they were created not able to understand their network. However, when the phones have been well received, was the electromagnetic field, they created the lowest of all our activities. The first precaution is to do that when you call an area of ​​good reception. In this respect seem femtocells (already sold by SFR in France and should be generalized for Free) is a good solution: they even make a very low VGP-BPS13/Q Battery power, and minimize emissions from mobile phones.

For mobile phones coverage, came DECT phones, whose power is often unexpected. It is therefore important to move on models "Eco" or go back to landline. Concerned parents should be aware that baby DECT phones work too. Finally, Wi-Fi networks were among the least effective.

Our test, we have unfortunately not possible to measure many other technologies such as WiMax, Bluetooth, CPL. Similarly, it was impossible to see the behavior of the 4G phone networks, not yet in operation.