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Property W2ENY, may be shared without cost as long as credit is given to W2ENY RF Safety Program - Guidelines for Compliance - Understanding Site Requirements.

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Presentation on theme: "Property W2ENY, may be shared without cost as long as credit is given to W2ENY RF Safety Program - Guidelines for Compliance - Understanding Site Requirements."— Presentation transcript:

1 Property W2ENY, may be shared without cost as long as credit is given to W2ENY RF Safety Program - Guidelines for Compliance - Understanding Site Requirements for Radio Frequency Electromagnetic Fields Robert Langston Amateur Call W2ENY

2 Property W2ENY, may be shared without cost as long as credit is given to W2ENY OVERVIEW Requirements Dates 1997 FCC Order 1997 OET65 Guidelines Exposure Levels Antenna Proximity Exclusions and Compliance Control of Non-Conforming Sites

3 Property W2ENY, may be shared without cost as long as credit is given to W2ENY REQUIREMENTS October 15, 1997 –All new, modified and renewal sites September 1, 2000 –All sites must comply Regions required to ensure compliance Comply with the spirit and precautions outlined in the standards Use common sense where not specific

4 Property W2ENY, may be shared without cost as long as credit is given to W2ENY 1997 FCC Order The standard sets RF Exposure Levels Occupational and General Public levels differ Limits are averaged exposure over time Shared responsibility for compliance in co-located sites

5 Property W2ENY, may be shared without cost as long as credit is given to W2ENY FCC SPEC and ENVIRONMENTS Controlled Environment Limits –Exposure at some level is possible –Persons trained to know exposure is possible Uncontrolled Environment Limits –Exposure at some lower level is possible –General Population –Oblivious to knowing theyre being exposed –1/5 the Controlled level

6 Property W2ENY, may be shared without cost as long as credit is given to W2ENY 1997 OET 65 Guidelines Evaluating Compliance with FCC rules Prediction Methods Multiple Transmitter Sites Sample Calculations Measurement Techniques Controlling Exposure

7 Property W2ENY, may be shared without cost as long as credit is given to W2ENY EXPOSURE vs FREQUENCY

8 Property W2ENY, may be shared without cost as long as credit is given to W2ENY RF Exposure and Absorption Maximum Exposure averaged over time –Controlled: 6 minutes –Uncontrolled: 30 minutes Exposure measured as: –Power Density (mW/cm²) Absorption measured as: –Thermal heating effect (Watts/Kilogram) Sites may include other signals

9 Property W2ENY, may be shared without cost as long as credit is given to W2ENY ANTENNA PROXIMITY Behind the Antenna –Front to Back ratio usually 30dB –Factor of 1000 times Above, Below or Beside Antenna –Signals are greatly reduced –Isolated by 30 to 40dB –Factor of 1000 or better

10 Property W2ENY, may be shared without cost as long as credit is given to W2ENY TYPICAL ANTENNA This is a FRONT VIEW Mounted from back side Cables attach from back or bottom Antenna is Covered –Fiberglass or Plastic –NO ELECTRICAL SHOCK HAZARD –NO EXPOSED ELEMENTS

11 Property W2ENY, may be shared without cost as long as credit is given to W2ENY FRONT/SIDE VIEW Front to Back Ratio Side Nulls Over and Under Nulls Above, Below and Side signals are reduced

12 Property W2ENY, may be shared without cost as long as credit is given to W2ENY Control of Fields Time Averaging –Based on Transmit vs. Receive –Duty Factors Spatial Averaging –FCC Spec. is a whole body average Elevate or Re-Orient Antenna Boundary Restrictions Fencing, Signs and Access Control

13 Property W2ENY, may be shared without cost as long as credit is given to W2ENY Duty Factor by Mode

14 Property W2ENY, may be shared without cost as long as credit is given to W2ENY Averaging

15 Property W2ENY, may be shared without cost as long as credit is given to W2ENY Averaging

16 Property W2ENY, may be shared without cost as long as credit is given to W2ENY TriBander Estimates

17 Property W2ENY, may be shared without cost as long as credit is given to W2ENY VHF/UHF Estimates

18 Property W2ENY, may be shared without cost as long as credit is given to W2ENY Sloper

19 Property W2ENY, may be shared without cost as long as credit is given to W2ENY RF SAFETY EQUIPMENT Personal Monitors Narda Survey Meter Model 8718 E-Field Probe 8722B ( % Standard) –Isotropic Polarizationless 300KHz thru 40GHz

20 Property W2ENY, may be shared without cost as long as credit is given to W2ENY So What Happens If... FCC: License Revocation –Chance about Zero OSHA: $300 Fine per offense –Chance about Zero Public Liability / Lawsuit Do you love your neighbor? Does your neighbor need the money?


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