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<div class="moz-cite-prefix">Boas<br>
Afinal qual é a exposição segura de um radio amador à RF (radio
frequência)?<br>
Quais são os limites legais?<br>
Só ouço falar em Kw!<br>
Qual a concequencia de cada watt para a nossa saúde?<br>
Sinceramente, não sei nada sobre este assunto....<br>
<pre class="moz-signature" cols="72">Gomes, CT1HIX
<a class="moz-txt-link-freetext" href="http://www.ct1hix.webs.com/">http://www.ct1hix.webs.com/</a></pre>
Em 05-04-2013 14:22, João Gonçalves Costa escreveu:<br>
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<p class="MsoNormal"><span lang="EN-US">FCC seeks to reassess RF
exposure limits<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">On March 27, the FCC
released a First Report and Order, Further Notice of
Proposed Rulemaking and a Notice of Inquiry (ET Docket Nos.
13-84 and 03-137). The documents seek to reassess the FCC's
RF exposure limits and policies, as well as to propose
changes to the FCC's rules regarding human exposure to RF
electromagnetic fields.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">These proposed changes
would affect the Amateur Radio Service (Part 97) rules. The
First Report and Order can be found on the web in PDF format
at,
<a moz-do-not-send="true"
href="http://transition.fcc.gov/Daily_Releases/Daily_Business/2013/db0329/FCC-13-39A1.pdf">http://transition.fcc.gov/Daily_Releases/Daily_Business/2013/db0329/FCC-13-39A1.pdf</a>
.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In the 201-page
document, the FCC noted that "[periodic review of the
government's rules and regulations to ensure they have kept
pace with current knowledge and changing needs is an
important characteristic of good government, and we here
will advance the process of providing a comprehensive review
and modification, where appropriate, of this Commission's
various rules pertaining to the implementation of the
National Environmental Policy Act (NEPA) requirements for
environmental reviews, specifically those reviews related to
health and safety of radiofrequency (RF) emissions from
radio transmitters. Our actions herein are intended to
ensure that our measures are compliant with our
environmental responsibilities and requirements and that the
public is appropriately protected from any potential adverse
effects from RF exposure as provided by our rules, while
avoiding any unnecessary burden in complying with these
rules."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The document is divided
into three parts: a First Report and Order (First R&O)
and a Further Notice of Proposed Rulemaking (FNPRM) in ET
Docket No. 03-137, and a Notice of Inquiry (Inquiry) in a
new docket, ET Docket No. 13-84. In the R&O, the FCC
looks at several technical and semantic issues -- initiated
in 2003 -- to be revised and updated; in the FNPRM, the FCC
proposes to further update and revise its procedures and
treat all services equally.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In the Inquiry, the FCC
seeks comments to determine whether its RF exposure limits
and policies need to be reassessed. "Since consideration of
the limits themselves is explicitly outside of the scope of
ET Docket 03-137, we propose with the Inquiry to open a new
docket to consider those limits in light of more recent
developments," the FCC said. "The Inquiry is intended to
open discussion on both the currency of our RF exposure
limits and possible policy approaches regarding RF exposure.
We look forward to developing a complete record to determine
whether the current rules and policies should remain
unchanged, or should be relaxed or tightened."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">According to the FCC,
mitigation matters are "post-evaluation procedures to ensure
exposure limits are not exceeded, such as labels, signs,
barriers, enforcement and occupational issues." In its
Notice of Inquiry, the FCC included clarifications related
to the application of occupational exposure limits for
devices and at fixed transmitter sites. The FCC noted that
it "should be helpful to licensees to codify our earlier
adopted policy with regard the use of
occupational/controlled limits at Amateur Radio stations."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This policy was first
established in the RF Report and Order of 1996, but it was
not incorporated in the rules at that time. It allows
amateur stations to be evaluated "with respect to
occupational/controlled exposure limits, as long as
appropriate training and information has been provided to
the amateur licensee and members of his or her immediate
household. Other nearby persons who are not members of the
amateur licensee's household must be evaluated with respect
to the general population/uncontrolled exposure limits." The
FCC will codify this policy by adding a paragraph as a new
sub-section in Section 1.1310 -- radiofrequency radiation
exposure limits -- to its rules.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The FCC pointed out that
one goal of the general exemptions from routine RF exposure
evaluation proposed "is to avoid specific exemptions for
particular services and ensure a consistent set of rules
without exceptions." With this in mind, the FCC is proposing
to delete the special exemptions from evaluation in the
Amateur Radio Service in Section 97.13(c) of its rules.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">"We appreciate that
Amateur Radio operators are knowledgeable about the
appropriate use of their equipment, such that separation
distances are likely to be maintained to ensure compliance
with our exposure limits," the FCC said. "However, since the
existing amateur exemptions are based only on transmitter
power and do not consider separation distance or antenna
gain, exempt transmitting antennas that are unusually close
to people could potentially lead to non-compliant exposure
levels." The FCC said that a separation distance of at least
24 feet would meet its proposed exemption criteria,
"considering a currently exempt 50 W transmitter at VHF in
accord with Section 97.13(c) and assuming an antenna gain of
6 dBd."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The FCC noted that
existing classification of amateur exposure as occupational
"is consistent with use of our proposed general exemption
criteria based on general population exposure limits because
awareness of exposure greater than the general population
limits is required in all occupational settings, including
amateur households. Application of the general exemptions
proposed here to Amateur Radio installations would preclude
the possibility of overexposure and require further
evaluation only when necessary, giving guidance for both
fixed and mobile transmitting antennas."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The FCC invited comments
on how this would affect the amateur community: "Parties
that support maintaining the current exemption based on
power alone are requested to explain how it provides
adequate assurance that the public is protected against
exposure to RF energy in excess of our limits and the extent
of the burden imposed by this proposal. We encourage
interested parties to comment on the relative costs and
benefits of the proposed changes in this section, as well as
those of alternative approaches."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">"The ARRL has an RF
Safety Committee, consisting of experts in the field,"
explained ARRL Chief Executive Officer David Sumner, K1ZZ;
"The committee members, as well as Board members and staff
are reviewing the lengthy document and will formulate a
response."<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Comments will be
accepted until 90 days after the R&O, FNPRM and Notice
of Inquiry are published in the Federal Register (this can
take up to six weeks after its release by the FCC). Reply
comments will be accepted until 150 days after publication
in the Federal Register.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Fonte: The American
Radio Relay League<o:p></o:p></span></p>
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