Futurecom 8A535X03 User Manual page 7

Use the following MPE Safe Distance calculation for other than 5W ERP antenna power:
Calculation Method for RF Safety Distance r:
2
S = PG/4Πr =EIRP/4Πr
Where:
RF EXPOSURE DISTANCE LIMIT: r = (PG/4ΠS)
For General Population/ Uncontrolled Exposure:
2
S = 0.2
mW/cm
S = f/1500 in
mW/cm
frequency in MHz.
As an example, let us consider a case of minimum frequency f = 931.0125MHz, ERP RF power P =
5.0W:
ERP = 5000 mW = 10 log(5000) dBm = 37.0 dBm
S = 931.0125/1500
mW/cm
For General Population/bystanders: r = (ERP/4ПS)
The MPE safe distance is therefore at least 25.4cm (10.0").
ATTENTION!
The MOBEXCOM OCR must be restricted to occupational use only to satisfy FCC RF
Exposure requirements.
8A535X03 Rev. Preliminary-00
2
P: power input to the antenna in mW.
EIRP: Equivalent (effective) isotropic radiated power in mW.
S: power density mW/cm
G: numeric gain of antenna relative to isotropic radiator.
r: distance to centre of radiation in cm.
for frequency range of 30MHz – 300MHz.
2
for frequency range of 300MHz – 1500MHz. f is the minimum used
2
2
.
1/2 1/2
= (EIRP/4ΠS)
1/2
= (5000/4П(931.0125/1500))
1/2
= 25.32cm.
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