# RF Safety Evaluation for W3ZR's Station

This is a main beam power density estimation intended for use as part of a routine evaluation of RF safety compliance with FCC regulations. Beginning January 1, 1998, Amateur Radio operators licensed by the Federal Communications Commission of the United States of America will be required to do a "routine evaluation" of the strength of the RF fields around their stations. Operators who use transmitter power of 50 watts or less peak envelope power, and mobile stations using push-to-talk microphones (regardless of power) are exempt from the routine evaluations (but not exempt from compliance with the exposure limits.) These new rules can be found in the FCC's ET Docket No. 93-62. More information can be found at the ARRLWeb's RF Safety page.

This estimation used the formulas given in FCC OET Bulletin No. 65 to estimate power density in the main lobe of an antenna, with use of the EPA-recommended ground reflection factor as an option. This estimation is intended for approximate far-field calculations. It may overestimate the actual field strength of high-gain antennas in the near field (within several wavelengths of the antenna.) However, it may also underestimate the strength of fields that may be encountered in hot spots in the near field.

Calculation Results - 80/75 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 3.750 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 64.00 mw/cm2 12.81 mw/cm2 Distance to Compliance From Center of Antenna 2.97 feet 6.58 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 40 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 7.150 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 17.61 mw/cm2 3.53 mw/cm2 Distance to Compliance From Center of Antenna 5.62 feet 12.50 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 30 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 10.125 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 8.78 mw/cm2 1.76 mw/cm2 Distance to Compliance From Center of Antenna 7.94 feet 17.68 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 20 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 14.175 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 4.48 mw/cm2 0.90 mw/cm2 Distance to Compliance From Center of Antenna 11.09 feet 24.73 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 17 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 18.125 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 2.74 mw/cm2 0.55 mw/cm2 Distance to Compliance From Center of Antenna 14.17 feet 31.61 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 15 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 21.175 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 2.01 mw/cm2 0.41 mw/cm2 Distance to Compliance From Center of Antenna 16.54 feet 36.93 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 12 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 24.950 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.45 mw/cm2 0.29 mw/cm2 Distance to Compliance From Center of Antenna 19.48 feet 43.50 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 10 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 28.800 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.09 mw/cm2 0.22 mw/cm2 Distance to Compliance From Center of Antenna 22.48 feet 50.20 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 6 Meters

 Average Power at the Antenna 1500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 100.00 feet Frequency of Operation 52.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0546 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.00 mw/cm2 0.21 mw/cm2 Distance to Compliance From Center of Antenna 23.41 feet 52.29 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 2 Meters

 Average Power at the Antenna 500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 50.00 feet Frequency of Operation 146.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0728 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.00 mw/cm2 0.21 mw/cm2 Distance to Compliance From Center of Antenna 13.54 feet 30.21 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 1.25 Meters

 Average Power at the Antenna 500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 50.00 feet Frequency of Operation 222.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0728 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.00 mw/cm2 0.21 mw/cm2 Distance to Compliance From Center of Antenna 13.54 feet 30.21 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 70 cm

 Average Power at the Antenna 500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 50.00 feet Frequency of Operation 440.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0728 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 1.47 mw/cm2 0.30 mw/cm2 Distance to Compliance From Center of Antenna 11.19 feet 24.96 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 33 cm

 Average Power at the Antenna 500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 50.00 feet Frequency of Operation 915.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0728 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 3.05 mw/cm2 0.61 mw/cm2 Distance to Compliance From Center of Antenna 7.77 feet 17.32 feet Does the Area of Interest Appear to be in Compliance? yes yes

Calculation Results - 23 cm

 Average Power at the Antenna 500.000 watts Antenna Gain in dBi 2.20 dBi Distance to the Area of Interest 50.00 feet Frequency of Operation 1270.000 MHz Are Ground Reflections Calculated? Yes Estimated RF Power Density 0.0728 mw/cm2

 Controlled Environment Uncontrolled Environment Maximum Permissible Exposure (MPE) 4.24 mw/cm2 0.85 mw/cm2 Distance to Compliance From Center of Antenna 6.61 feet 14.71 feet Does the Area of Interest Appear to be in Compliance? yes yes