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| | Exposure Safety Assessment of GSM base station antennas - RF Cafe Forums |
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| midea11 | Post subject: Exposure Safety Assessment of GSM base station antennas Posted: Sun May 09, 2010 6:46 am |
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Joined: Sun May 09, 2010 6:38 am
Posts: 1 | Hi, does anyone know how to carry out an RF survey for an exposure assessment. It's my final year project and i'm kinda lost on how to do it.
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| nubbage | Post subject: Re: Exposure Safety Assessment of GSM base station antennas Posted: Tue May 11, 2010 9:17 am |
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Joined: Fri Feb 17, 2006 12:07 pm
Posts: 236
Location: London UK | Hi
There are several approaches to this, depending on your location and your project budget.
There are possibilities to short-term hire either a bespoke EMI/EMR radiation monitor test set, which often comes complete with a useful treatise on the technology to guide you thru the measurements, or a more Do It Yourself approach is to obtain or hire a battery-portable spectrum analyzer covering the GSM frequency range (800 to 1900MHz), then make your own brodband antenna. The latter usually takes the form of a log-periodic yagi antenna. Standard reference text books cover the inter-conversion of different electromagnetic field strength quantities such as dBm, microvolts per square carrot etc.
Measurements are made at fixed intervals, a typical starting point being either 3 or 10 meters from the antenna being studied.
There are international standards for the safety limits published by the International Telecom Union (ITU-R), the IEC and others, as well as government legal limits. These usually define the technical terms and show diagrams of what is involved. A web search will reveal all these for you.
I may have some refernces myself, but I am away from base for a while at present.
_________________
At bottom, life is all about
Sucking in and blowing out.
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| Kirt Blattenberger | Post subject: Re: Exposure Safety Assessment of GSM base station antennas Posted: Tue May 11, 2010 2:33 pm |
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Joined: Sun Aug 03, 2003 2:02 pm
Posts: 451
Location: Erie, PA | Greetings mideall:
Ham radio control operators are required to conduct radiation exposure surveys under some station conditions, so there is a plethora of information in layman's language on how to carry out evaluations on the ARRL website.
http://www.arrl.org/rf-exposure _________________ - Kirt Blattenberger  RF Cafe Progenitor & Webmaster |
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Posted 11/12/2012
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Kirt
