What is radiation?
Electromagnetic radiation consists of electrical and magnetical radiation. This radiation exists in many different frequencies. Low frequencies are often found in eg. compters and electrictronic equipment. High frequencies are often found in mobile phones and phone masts.
SAR means Specific Absorption Rate and is measured in W/kg. This means the amount of electromagnetic radiation penetrates living creatures and objects. Besides that it indicates how much is absorbed in human tissue. Should a SAR value be as low as possible? There are also indications that cell phones with a low SAR value have to emit stronger radiation to keep connection to the network. The German Insitute Der Blaue Engel advices a SAR value below 0,6 W/kg. The FCC certification is needed for a phone to be sold in the United States, the FCC states that the maximum SAR level must be 1.6 watts per kilogram. In Europe, the level is capped at 2 watts per kilogram, while Canada allows a maximum of 1.6 watts per kilogram.
The German magazine Connect introduced a new measurement in which they have included different factors besides SAR only. They name this the Connect radiationvalue. This value consists not only of the SAR value but also the effective power and transmisssion features. The value is the most effective transmission power in relation to the SAR value. The magazine also advices a connect value as low as possible when purchasing a mobile phone. It is unclear of which exact features the value consists. A negative value in the comparisons on this website means that the value is lower that the average value. A positive value indicates an above average radiation load of the particular phone.
What is the connection speed of the different systems?
- 2G GSM : 9.6 kbps or a multiple of this with HSCSD
- 2.5G GPRS: 52 kbps (Possible extension to EDGE 384 kbps)
- 3G UMTS: 384 kbps (max. 2 Mbps by applications)
- 3.5G HSDPA to 14 Mbps
- 4G LTE tp 100 Mbps