Notices Notices-iiiDXL5000 User and Technical Manual
Conversions
dBi to numeric gain = Antilog (dBi/10)
Feet to centimeters = Feet * 30.48
Centimeters to Feet = cm * .0328
4 π = 12.57
User Input
RF power delivered to the antenna = Watts
Antenna gain (referenced to isotropic antenna) = dBi
Distance from the center of radiation = Feet
Calculation steps:
1. [P] RF power input. Convert watts to milliwatts = Watts *
1000
2. [G] Antenna gain dBi. Convert to numeric gain = Antilog
(dBi/10)
3. [EIRP] Multiply P * G
4. [R] Convert 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 examples shown in Figure 1 and Figure 2 are typical graphs
showing the permissible exposure distance for various antennas.
The plots provide the maximum permissible output of the
DXL5000 Transmitter System at 1 Watt and 2 Watts of RF power
for all frequency bands with digital modulation outputs.
MRC, in accordance with the requirements set forth by the FCC,
provides this information as a guide to the user. It is assumed
that the 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.
Figure 1: Digital Modulation - Low Power
Maximum Permissible Exposure
A ll B an ds, St an da rd Pow e r 1 Wat t (+30dB m)
0
10
20
30
40
50
60
70
80
0 2 4 6 8 10121416182022242628303234363840424446485052545658
Distance in Feet
Power Density (mW/cm^2)
0dBi
29dBi
36dBi
40dBi
43dBi
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