national standard 】 【
no higher than 0.4 watts per square metre
experimental samples 】 【
low wireless router for cisco production linksys54G wireless router
when connected to the wireless router equipment for apple production retnia macbook pro computer and iphone 4 s mobile phone, and samsung mobile phone 719.
Beijing – along with the increase in home Internet device, a network interface is not enough, use the wireless router becomes the choice of many people. For a long time, many people are sceptical of wireless routers, question the radiation produced by a harm to human body, and even some netizens said its radiation is or is likely to cause cancer. Then the radiation of wireless router? Is there a influence to human body health? On July 16, the Beijing news reporter, with Beijing director of the institute of environmental science Yuan Yuming about wireless router radiation experiment was carried out.
this experiment investigated two kinds of wireless router in standby and working to make radio radiation testing, test tools for the comprehensive field strength meter.
Yuan Yuming introduction, according to the frequency characteristics of the wireless router transmitting, apply to the environment electromagnetic waves allow radiation intensity classification standard “electromagnetic radiation protection sets” the electromagnetic environment health standard “and other laws and regulations and technical standards of” 30 million – 30 g “in the spectrum of radiation limit, namely 0.4 watts per square meter, the standard is lower than the eu standard dozens of times.
it was found that radiation value and its working state of the wireless router, is close to the distance, the working status, radiation instantaneous maximum 0.2 watts per square meter, and standby when radiation is only 0.01 watts per square metre; Half a meter, wireless router radiation decay quickly, at this time of numerical and daily use of 3 g mobile phone radiation values.
although these tests of radiation values are lower than the national standard, but experts suggest that wireless router at best half meters distance away from the human body, need not when can shut off the power; Try to avoid mobile phones, microwave ovens used at the same time the superposition of radiation effects of radiation equipment. In addition, in does not affect the use, can also through the reduction of the number of wireless router antenna way to reduce the radiation.
1 meter outside radiation attenuation hundreds times value
the purpose: to test the wireless router in the working status of radiation.
experiment process: experiment operator will computers to connect to the wireless router, computer generated by the wireless router wifi to download files from the Internet, the rate of 200 k/SEC. Respectively, then the comprehensive field intensity meter stick beside the wireless router, from 0.5 meters of wireless router, 1 m away from the wireless router, measuring the value of radiation, the results (see table 1).
Beijing director of the institute of environmental science experts read 】 【 Yuan Yuming said, closely related to radiation value and its working state of the wireless router, in connection with the computer is in a state of high flow of data download, the radiation values will be relatively high, even instant there will be a higher value. But half a meter, wireless router radiation attenuation quickly.
lower standby mode radiation values
the purpose: to test the wireless router in standby mode.
experimental process: cut off all the wireless router with wifi connection equipment, respectively integrated field strength meter stick beside the wireless router, from 0.5 meters of wireless router, 1 m away from the wireless router, measuring the radiation value results (see table 2).
Yuan Yuming experts read 】 【 advice, although even post on the edge of the wireless router, radiation values also conform to the requirements of the country, but the long-term use of it is better to place the wireless router in distance seat more than half a meter or distance, “especially careful not to put in bedroom bed or near in the area of children often activity, because compared with adults, children’s resistance to radiation is lower.”
2 g phone model radiation greater
the purpose: to test mobile phone radiation, radiation and wireless router in order to facilitate comparison.
experimental process: the comprehensive field intensity meter stick beside the wireless router, away from the wireless router 0.5 meters, 1 m away from the wireless router, measuring the radiation values. Respectively test 719 samsung mobile phone for China mobile’s 2 g GSM mode, samsung mobile phone to China telecom 3 g 719 CDMA2000 pattern, the iphone 4 s in China unicom WCDMA 3 g mode radiation value results (see table 3).
Yuan Yuming experts read 】 【 said, three experiments, wireless router and mobile phones are in conformity with the national standard is not higher than 0.4 watts per square metre. Wireless router and a half meters outside the radiation value of basic and daily use of 3 g mobile phone radiation values.
the tests, the maximum radiation pattern for China mobile’s GSM 2 g, 0.3 Yuan Yuming explanation say, this is determined by the operation mode of the 2 g, 2 g era, the base station is full power transmitting to the user. And 3 g base stations can be according to the user’s distance to adjust power at any time. This can also prompt you, if you want to try to reduce the radiation, should choose the 3 g mobile phone model. It is important to note that although some phone support 3 g model, but some people because of the trouble, don’t want to change, or as a result of using the mobile phone of the 2 g mode to standby and talk, it is unable to reduce the radiation effect.
can reduce antenna in order to reduce radiation
in excess of the prescribed intensity, electromagnetic radiation can be thought of as electromagnetic pollution, although the electromagnetic pollution colorless, tasteless, but the possibility of harm to the body. So should try to reduce the electromagnetic pollution in the family, such as wireless router can be shut off the power when not in use in the night; Try to avoid mobile phones, microwave ovens used at the same time the superposition of radiation effects of radiation equipment.
in addition, the reporter discovers through other tests, three antennas, wireless routers use than when an antenna radiation increased significantly. Thus, the antenna with radiation gain effect of wireless router, therefore, can try to have three antenna wireless router was reduced to two or one, as long as the coverage can satisfy the use.
if temporary not devices such as mobile phone, using the Internet can be output in the wireless router with Ethernet cable network interface are connected to the Internet equipment such as computers (part of the wireless router does not have the output cable interface), to remove all the antenna wireless router at the same time, reduce the radiation levels.
this version concludes the Beijing news reporter RaoPei
(this experiment only responsible for the test sample)