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Exposure Safety Assessment of GSM base station antennas - RF Cafe
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| midea11
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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 |
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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 |
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Post subject: Re: Exposure Safety Assessment of GSM base station antennas
Posted: Tue May 11, 2010 9:17 am
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 236
Location: London UK
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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
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Post subject: Re: Exposure Safety Assessment of GSM base station antennas
Posted: Tue May 11, 2010 2:33 pm
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| Site Admin |
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Joined: Sun Aug 03, 2003
2:02 pm
Posts: 451
Location: Erie, PA
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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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