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30 July 2010

Answer to Question #1747 Submitted to "Ask the Experts"

Category: Microwaves, Radar, and Radiofrequency — Microwaves and Radiofrequency

The following question was answered by an expert in the appropriate field:

My radio operates on the frequency of 416.3750. I was just wondering how much radiation will be put out by the antenna and how far away should the antenna be from the operator of a car/boat, etc.?

I am not sure that I can do an exact calculation, but I can give you a reference to look up. The Federal Communications Commission (FCC) has a Web site on "Radiofrequency Safety." The FCC also has an RF Safety Bulletin (OET Bulletin #56) titled "Effects and Potential Hazards of Radiofrequency Electromagnetic Fields." You can download that as a pdf file or a Word document. The whole bulletin has a lot of good information, but you may want to look specifically at pages 18 and 19: "Are emissions from Radio and Television Antennas Safe?" Generally the public does not have access to areas around broadcast stations. The FCC limits for exposure are given on pages 15 and 16. You will have to calculate the specific absorption rate (SAR) in units of watts/kg.

Ninni Jacob, CHP

Answer posted on 27 April 2002. The information and material posted on this Web site is intended as general reference information only. Specific facts and circumstances may alter the concepts and applications of materials and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice specific to whatever facts and circumstances are presented in any given situation. Answers are correct at the time they are posted on the Web site. Be advised that over time, some requirements could change, new data could be made available, or Internet links could change. For answers that have been posted for several months or longer, please check the current status of the posted information prior to using the responses for specific applications.