Company Name:
Sandisk Corporation
Eut:
SanDisk SSD UATA 5000 1.8”
Client Reference Number:
QRTL06-334
Work Order Number:
2006137
Compliance Report
Page 15 of 17
6.2 F
IELD
S
TRENGTH
C
ALCULATION
The field strength is calculated by adding the Antenna Factor and Cable Factor, and subtracting
the Amplifier Gain (if any) from the measured reading. The basic equation with a sample
calculation is as follows:
FI(dBuV/m) = SAR(dBuV) + SCF(dB/m)
FI = Field Intensity
SAR = Spectrum Analyzer Reading
SCF = Site Correction Factor
The Site Correction Factor (SCF) used in the above equation is determined empirically, and is
expressed in the following equation:
SCF(dB/m) = - PG(dB) + AF(dB/m) + CL(dB)
SCF = Site Correction Factor
PG = Pre-amplifier Gain
AF = Antenna Factor
CL = Cable Loss
The field intensity in microvolts per meter can then be determined according to the following
equation:
FI(uV/m) = 10FI(dBuV/m)/20
For example, assume a signal at a frequency of 125 MHz has a received level measured as
49.3 dBuV. The total Site Correction Factor (antenna factor plus cable loss minus preamplifier
gain) for 125 MHz is
-11.5 dB/m. The actual radiated field strength is calculated as follows:
49.3 dBuV - 11.5 dB/m = 37.8 dBuV/m
10
37.8/20
= 101.89 = 77.6 uV/m