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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">
<path stroke-linecap="round" stroke-linejoin="round" d="M13 5l7 7-7 7M5 5l7 7-7 7" />
</symbol>
<symbol id="lt-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">
<path stroke-linecap="round" stroke-linejoin="round" d="M11 19l-7-7 7-7m8 14l-7-7 7-7" />
</symbol>
<symbol id="trash" xmlns="http://www.w3.org/2000/svg" class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor">
<path stroke-linecap="round" stroke-linejoin="round" d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0" />
</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 3 - Determine Antenna Gain</h2>
<div class="progress p-0">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
</div>
</div>
<div class="row mt-3">
<p>The next step is to discover and determine the gain of your antenna. Commercial
manufacturers will publish the gain in dBi (gain over a theoretical antenna)
or dBd (gain over a dipole) for each band they are designed to be operated on.
Look up the antenna to be assessed on the manufacturer's website. For the purposes
of the FCC Exposure Analysis, the gain must be expressed as dBi. If the published
value is dBd, add 2.2 to the gain before entering it into this form.
</p>
<p>If the information is unknown, or the antenna is a homebrew, use the table provided
by the <a target="_blank" href="http://www.arrl.org/rf-exposure-calc-instructions#gain">ARRL</a> and the RSGB to approximate the gain.
</p>
<p>Note: For a highly directional antenna such as a Yagi, keep in mind that this
calcuator will only provide the "worse case" scenario. It may be valuable depending
on installation location to perform more precise calculations in different directions/gains
when an antenna isn't generally rotated. Performing this is outside the scope of this calculator.
</p>
<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 Antenna Information</p>
</div>
<div class="mb-3">
<label for="antennatype">Antenna Type</label>
<input type="text" class="form-control" id="antennatype" name="antennatype" required>
</div>
<div class="mb-3">
<label for="antennagain">Antenna Gain dBi</label>
<br><i>Number only</i>
<input type="text" class="form-control" id="antennagain" name="antennagain" placeholder="2.1" required>
</div>
<div class="mb-3">
<button type="button" class="shadow" onclick="backClick('2')"><svg class="svgicon"><use href="#lt-chevron"></use></svg> Back</button>
<button type="button" class="shadow" onclick="nextClick('4')">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 px-5 report-out">
<div class="mb-3 subheaderbar">
<p class="text-center text-white text-bold">Entered Station Information</p>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="radioname">Radio</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="radioname" name="radioname" readonly>
</div>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="frequency">Frequency</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="frequency" name="frequency" readonly>
</div>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="power">Radio Power Out</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="power" name="power" readonly>
</div>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="feedtype">Feedline Type</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="feedunit" name="feedtype" readonly>
</div>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="feedlength">Feedline Length</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="feedlength" name="feedlength" readonly>
<input type="hidden" class="form-control-plaintext" id="feedunit" name="feedunit" readonly>
</div>
</div>
<div class="mb-3 row">
<label class="col-sm-6 col-form-label" for="feedloss">Power Loss per 100 units (dB)</label>
<div class="col-sm-6">
<input type="text" class="form-control-plaintext" id="feedloss" name="feedloss" readonly>
</div>
</div>
</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>