ARRL RF Exposure Presentation via the ADXA Meeting
Bill Mader, K8TE
Good afternoon Folks,
N2GG, Gil, Kent OR
K6IR, John, Kent OR
N5SJ, Mike, Gallup NM
KS5Z, Terry, Lubbock, TX
K5WY, Ty, Los Lunas NM
WB2FKO, Mike, High Springs FL
AG5S, Alden, Santa Fe NM
KG5IDN, Ken, Rio Rancho NM
K8TE, Bill, Rio Rancho NM
For stations built prior to 3 May 2021, 3 May 2023 is deadline to complete your assessment.
Use http://hintlink.com/power_density.htm for an on-line RF Exposure Calculator.
https://hamradioschool.com/rf-exposure-evaluating-your-station/ is a page with pertinent references and a link to an Excel spreadsheet you can download for use without Internet access.
The link to the free ARRL RF Exposure "book" is: http://www.arrl.org/rf-exposure. This “book” does NOT contain the updated FCC rules effective 3 May 2021 but is otherwise extremely helpful.
https://www.eznec.com/eznec.htm free version good for modeling antennas like loops, dipoles, small Yagis, etc.
Radios "Marketed prior to 3 May 2021 are 'pretty much' grandfathered."
Remember, evaluation is required, but not measurements.
End-fed antennas and feedlines that are grounded are not necessarily safe due to common mode current. They require current chokes. Grounded doesn't necessarily "sink" the RF on the feedline to ground, eliminating RF near persons.
Transmission lines to truly balanced antennas do not radiate RF. However, our antennas may not be perfectly balanced. Consider using an MFJ-852 for detecting RF on coax and other cables to determine if you have an RF Exposure issue.
Contact the ARRL Lab if you get in a jam with some weird antenna situation, i.e., not included in the “standard” calculators. http://www.arrl.org/arrl-assistance
Instruct family members so they are aware to avoid hanging out close to antennas.
Yes, we need to evaluate portable or temporary antennas.
Regardless of false rumors you and others you know may have heard, 5G has more sites, but is safer, not more dangerous, because it uses lower power.
Conduct the evaluation based on the worst case (longest transmission time and/or nearest distance).
trs@... for help--
73, Bill Mader, K8TE
NM QSO Party 10 Apr 2021
ARRL New Mexico Section Manager
ARRL - The national association for Amateur Radio™
Duke City Hamfest Chairman www.dukecityhamfest.org 17-19 Sep 2021
Secretary and Past President, Albuquerque DX Association
W6H NM Coordinator, Route 66 On-the-Air 11-19 Sep 2021
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