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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Amateur Radio RF Exposure Calculator</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/local.css" rel="stylesheet">
<link rel="shortcut icon" href="img/rflogo.webp" sizes="any">
</head>
<body>
<svg aria-hidden="true" id="svgdefs" version="2" xmlns="http://www.w3.org/2000/svg">
<defs>
<!-- Symbols from https://heroicons.com/ Copyright 2022 by Tailwind CSS used under MIT License -->
<symbol id="rt-chevron" xmlns="http://www.w3.org/2000/svg" class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
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</symbol>
</defs>
</svg>
<header>
<div class="container-fluid p-1 mb-5 headerbar">
<img src="img/rflogo.webp" height="50px" class="mx-2" />
<span class="mx-3">RF Exposure Assessment Calculator</span>
</div>
</header>
<main>
<div class="container-md bg-white p-3 mb-5">
<div class="row calc-header">
<h2>Step 1 - Determine Maximum Radio Output Power</h2>
<div class="progress p-0">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 2%" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
</div>
</div>
<div class="row mt-3">
<p>The first step is to discover and enter the radio's maximum output power. This information
is usually found in the specifications section of the radio's manual. It may sometimes
be displayed within the radio's settings. When evaluating a multiband station, for example
an HF transceiver that does 160m to 10m, one can almost always calculate the entire station based
on the maximum power output at the highest frequency - in this example at the top end of the 10m band.
However, if the radio has multiple power levels depending on frequency, each band and power combination
will need to be calculated separatly. For example, an HF + 6m transceiver will often
have an output of 100 W for 160m to 10m but only 50 W on 6m. In this case, one would need to calculate
an 10m HF 100 W exposure and a VHF 6m MHz 50W exposure. Mobile style radios will have similar calculations -
for example many mobile radios output 50 W on 2m but only 35 W on 70cm. Inspect your radio's manual
to detemine which frequency and power level(s) you need to calculate.
</p>
<p>
For the best calculation, use the highest frequency within the band to be assessed. For example,
to assess a 2m radio, choose 148.0 MHz. For a 160m - 10m radio use 27.900 MHz.
Consult the <a target="_blank" href="http://www.arrl.org/files/file/Regulatory/Band%20Chart/Band%20Chart%20-%2011X17%20Color.pdf">ARRL US Amateur Radio Bands for the proper value.</a>
At the end of the walk-through, you can return to this screen to assess multiple frequencies and powers from the same system.
</p>
</div>
<div class="row">
<form id="report" name="report" class="form-l">
<div class="container-md">
<div class="row">
<div class="col-md-6">
<div class="mb-3 subheaderbar">
<p class="text-center text-white text-bold">Enter Radio, Frequency, & Power</p>
</div>
<div class="mb-3">
<label for="radioname">Radio Make/Model</label>
<input type="text" class="form-control" id="radioname" name="radioname" required>
</div>
<div class="mb-3">
<label for="frequency">Frequency</label>
<br><i>Enter the frequency in MHz in the format NNN.NNN. Trailing zeros are not necessary.</i>
<input type="text" class="form-control" id="frequency" name="frequency" required>
</div>
<div class="mb-3">
<label for="power">Power Output in Watts</label>
<br><i>Enter the power output, in watts, of your radio and/or amplifier before it enters any feeline to an antenna.</i>
<input type="text" class="form-control" id="power" name="power" required>
</div>
<div class="mb-3">
<button type="button" onclick="nextClick('2')" aria-label="Next" class="shadow">Next <svg class="svgicon"><use href="#rt-chevron"></use></svg></button>
<button type="button" onclick="restartClick()" aria-label="Clear Calculation" class="shadow">Clear Calculation <svg class="svgicon"><use href="#trash"></use></svg></button>
</div>
</div>
<div class="col-md-6">
</div>
</div>
</div>
</form>
</div>
</div>
</div>
</main>
<footer>
<div class="container-fluid">
<div class="row disclaimer px-5 py-2">
<h2>Important Disclaimer</h2>
<p>This site is one interpretation of the requirements of an amateur radio operator's obligations
and methods for ensuring compliance with the United States Federal Communication Commission's
requirements for RF exposure safety and analysis as required in OET Bulletin 65 and other
rules and regulations. This site is only guidance and may be incorrect or out-of-date with
current rules and interpretations of such rules. Use of this site is solely at your own risk
and the author(s) and operator(s) disclaim all liability resulting in any penalty or injury based
on information from this site. This site must never be used to ensure public safety or for commercial
purposes.
</p>
</div>
<div class="row bottom-footer px-5 py-2">
<p style="text-align:center">Copyright © Jason D. McCormick under the terms of the MIT License |
<a href="https://github.com/jxmx/rf-exp-assess">Code on GitHub</a>
</p>
</div>
</div>
</footer>
<script src="js/jquery-3.7.1.min.js"></script>
<script src="js/oet65.js"></script>
<script src="js/rfecalc.js"></script>
<script src="js/rf.js"></script>
</body>
</html>