Antenna
Gain
(dBi)
Minimum Safe
Distance from
Antenna (cm)
Minimum Safe
Distance from
Antenna (inch)
0
9
3.54
29
252
99.19
36
563
221.60
40
893
351.48
43
1261
496.33
Power
Density
(mW/cm^2)
Calculation steps:
1. [P] RF power input. Watts to milliwatts = Watts
*
1000
2. [G] Antenna gain dBi. Numeric gain = AntiLog (dBi/10)
3. [EIRP] Multiply P
*
G
4. [R] Centimeters to feet = Centimeters
*
.0328
5. Square R
6. Multiply R²
*
4π
7
. [S] Divide (R²
*
4π) into EIRP
S = Power Density in milliwatts per square centimeters.
NOTE:
At frequencies above 1500 MHz, S must not be greater than 1.
Reference
FCC OET Bulletin 65, August 1997 - Evaluating Compliance with FCC Guidelines for
Human Exposure to Radio Frequency Electromagnetic Fields
The following graphs and associated tables show the permissible exposure distance for various
antennas. Graphs and data will vary, based on the actual transmitter, output power, frequency,
and antenna utilized. One plot provides the permissible output of the transmitter for low-power
digital modulation, and the other plot for high-power digital modulation.
This information is provided, in accordance with the requirements set forth by the FCC, as a
guide for you assuming that users of this equipment are licensed and qualified to operate the
equipment per the guidelines and recommendations contained within the product user guides
and in accordance with any FCC rules that may apply.
Low Power
MaximumPermissible
Exposure
All Bands, Standard Power 1Watt (+30dBm)
80
70
60
50
40
30
20
10
0
0 2 4 6 8
101214161820
222426283032343638404244
4648
5052545658
Distance
inFeet
0dBi
29dBi
36dBi
40dBi
43dBi
DXL8000 User and Technical Manual Installing the DXL8000 2-3
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General