TRP Total Radiated Power
The total radiated power of the phone must satisfy GSM standards, otherwise the performance of the phone is not satisfactory.
The total radiated is strongly reduced in talk position. The difference is the head loss (due to absorption and mismatch). There is a correlation between head loss in W and SAR values in W/kg.
TCO'01 is the first quality marking of mobile phones that has requirements to the total radiated power. This is referred to by the positive term TCP = Telephone Communication Power.
The TCP can be measured in the Bluetest RC800 reverberation chamber with an expanded uncertainty of less than 1 dB (2 σ value).
Bluetest RC800 reverberation chamber and setup for radiated power measurements. The field is stirred by 2 mechanical stirrers, a platform stirrer, polarization stirring and 25 MHz frequency stirring.
Comparison between measured TCP in W and SAR values in W/kg of same 20 phones as below.
The 20 measured phones (left) and example of head phantom used in other measurements. (right).
Measured TCP values of 20 different phones in different CENELEC positions relative to head phantom. The phones are grouped according to their antenna type. EL = Extractable Long antenna, E = External antenna, BI = Built-In antenna
