RF Hazard Analysis

0123-EX-PL-2005 Text Documents

General Dynamics SATCOM Technologies, Inc.

2005-04-27ELS_70453

RF Radiation Safety Calculations
Spreadsheet Copyright by Tim Shroyer, General Dynamics C4 Systems 2005
RF Safety Calculations based on OET Bulletin 65 for Parabolic Reflectors.

Calculations are based on Bulletin 65 Equations 11 through 18.

Input Values
Frequency of Operation 14200 MHz
Reflector Diameter 0.60 Meters
Gain of Antenna 37.7 dBi
Input Power to Antenna 11.3 dBW
Input Power to Antenna 13.49 Watts

Resultant EIRP 49.00 dBW
79432.82 Watts

Power Density At Antenna Surface
(From Bulletin 65 Equation 11)

2
Maximum Power Density At Antenna Surface = 190.84 W/m
2
Maximum Power Density At Antenna Surface = 19.08 mW/cm
2
Maximum Power Density At Antenna Surface = 12.81 dBW/cm

Is this Compliant With Limits?
For Occupational/Controlled Exposure (5 mW/cm2)= NO
For General Population/Uncontrolled Exposure (1 mW/cm2)= NO

Power Density in the Near-Field Region

Extent of the Near-Field = 4.26 Meters
(From Bulletin 65 Equation 12)

Aperture Efficiency = 0.740 Units
(From Bulletin 65 Equation 14)

2
On-Axis Near-Field Power Density = 141.17 W/m
2
(From Bulletin 65 Equation 13) 14.12 mW/cm

Is this Compliant With Limits?
For Occupational/Controlled Exposure (5 mW/cm2)= NO
For General Population/Uncontrolled Exposure (1 mW/cm2)= NO

Power Density in the Transition Region

Beginning of Far-Field Region = 10.22 Meters
(From Bulletin 65 Equation 16)

Transition Region Power Density
(From Bulletin 65 Equation 17)
In the Transition Region, Power Density varies from
2
Power Density = 14.12 mW/cm at 4.26 Meters
2
Power Density = 5.88 mW/cm at 10.22 Meters

Is the Full Transition Region Compliant With Limits?
For Occupational/Controlled Exposure (5 mW/cm2)= NO
For General Population/Uncontrolled Exposure (1 mW/cm2)= NO

At What Range Is Power Density Compliant With Limits?
For Occupational/Controlled Exposure (5 mW/cm2)= Too Many Meters
For General Population/Uncontrolled Exposure (1 mW/cm2)= Too Many Meters

Power Density in the Far-Field Region

Far-Field Starts at = 10.22 Meters
2
Power Density at the start of Far-Field Region = 6.05 mW/cm
(From Bulletin 65 Equation 18)

At What Range Is Power Density Compliant With Limits?
For Occupational/Controlled Exposure (5 mW/cm2)= 11.24 Meters
For General Population/Uncontrolled Exposure (1 mW/cm2)= 25.14 Meters

Document Created: 2019-10-23 01:25:02
Document Modified: 2019-10-23 01:25:02

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC