What is used to calculate the power level for power class? A typical FCC test report will report multiple tests regarding Effective (Isotropic) Radiated Power. They mention “Total Average Output Power”, “Equivalent Isotropic Radiated Power”, “Measured Average Power”, and “Measured e.r.p”. Which one (or combination) is used to calculate power class?
And as an aside, which one does PTCRB/AT&T care about?
Thanks!!
Hi Sir,
EIRP=Pg(dBm)-cable loss(dB)+antenna gain(dBi)
ERP=EIRP+2.15(dBd)
Pg(dBm) is Power at the transmitter output
For example：
The conduction test output power of LTE BAND4 is 23.5 dBm, and the antenna gain of Band4 is 2 dBi, so the EIRP is 23.5dBm+2dBi=25.5dBm.
The limit value of FCC Band4 is 1W (30dBm)
Because 25.5dbm does not exceed the limit of 30dbm, it is pass.
Please refer to 3GPP for the standards of PTCRB and AT&T.