RF Safety Program Guidelines for Compliance Understanding Site

RF Safety Program - Guidelines for Compliance Understanding Site Requirements for Radio Frequency Electromagnetic Fields Robert Langston Amateur Call W 2 ENY Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

OVERVIEW u u u u Requirements Dates 1997 FCC 97 -303 Order 1997 OET 65 Guidelines Exposure Levels Antenna Proximity Exclusions and Compliance Control of Non-Conforming Sites Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

REQUIREMENTS u October 15, 1997 – All new, modified and renewal sites u September 1, 2000 – All sites must comply u u u Regions required to ensure compliance Comply with the spirit and precautions outlined in the standards Use common sense where not specific Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

1997 FCC Order 97 -303 u u 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 Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

FCC SPEC and ENVIRONMENTS u u 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 they’re being exposed – 1/5 the Controlled level Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

1997 OET 65 Guidelines u u u Evaluating Compliance with FCC rules Prediction Methods Multiple Transmitter Sites Sample Calculations Measurement Techniques Controlling Exposure Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

EXPOSURE vs FREQUENCY Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

RF Exposure and Absorption u Maximum Exposure averaged over time – Controlled: 6 minutes – Uncontrolled: 30 minutes u Exposure measured as: – Power Density (m. W/cm²) u Absorption measured as: – Thermal heating effect (Watts/Kilogram) u Sites may include other signals Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

ANTENNA PROXIMITY u Behind the Antenna – Front to Back ratio usually 30 d. B – Factor of 1000 times u Above, Below or Beside Antenna – Signals are greatly reduced – Isolated by 30 to 40 d. B – Factor of 1000 or better Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

TYPICAL ANTENNA u u 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 Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

FRONT/SIDE VIEW u u Front to Back Ratio Side Nulls Over and Under Nulls Above, Below and Side signals are reduced Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Control of Fields u Time Averaging – Based on Transmit vs. Receive – Duty Factors u Spatial Averaging – FCC Spec. is a whole body average u u u Elevate or Re-Orient Antenna Boundary Restrictions Fencing, Signs and Access Control Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Duty Factor by Mode Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Averaging Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Averaging Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Tri. Bander Estimates Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

VHF/UHF Estimates Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

Sloper Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

RF SAFETY EQUIPMENT u u u Personal Monitors Narda Survey Meter Model 8718 E-Field Probe 8722 B (0. 3 -300% Standard) – Isotropic Polarizationless 300 KHz thru 40 GHz Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY

So What Happens If. . . u FCC: License Revocation – Chance about Zero u OSHA: $300 Fine per offense – Chance about Zero u Public Liability / Lawsuit u Do you love your neighbor? u Does your neighbor need the money? Property W 2 ENY, may be shared without cost as long as credit is given to W 2 ENY