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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">
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</symbol>
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<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 2 - Determine Feedline Loss</h2>
<div class="progress p-0">
<div class="progress-bar progress-bar-striped" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
</div>
</div>
<div class="row mt-3">
<p>The next step is to discover and determine the power loss created by the feedline
between the radio and the antenna. For the purposes of this calculation, to err on the side of caution,
small losses from barrel connectors, etc. will be ignored.
</p>
<p>Measure or otherwise determine the length of the feedline. This should be the completele
length of all feedline exiting your radio/amp from the last page. Include any jumpers or drip loops. Recird this number below.
The unit of measurement can be either meters or feet below so long as the length and the dB loss per 100 "unit" is the
same unit of length.
</p>
<p>Determine the type of feedline used between your radio and the antenna. The loss is, in general,
greater for thinner coax and less for thicker coax. If you know the manufacturer of the feedline
in use, the manufacturer will publish a table of losses in dB at a given frequency per 100ft.
Determine where the frequency being measured falls into the chart and choose the larger
value in the range where the frequency lands. For example, if the chart lists
a 10 MHz value and a 30 MHz value and the frequency being measured is 14.225 (i.e. 20m) then
choose the upper value of the loss in dB at 30 MHz. This will ensure that maximum safety is applied
to the calulation.
</p>
<p>
If you are unable to determine the loss by published manufacturer, consider using the
<a target="_blank" href="https://static.dxengineering.com/global/images/chartsguides/d/dxe-8x.pdf">information
published by DX Engineering</a>, the
<a target="_blank" href="https://www.timesmicrowave.com/Calculator">Times Microwave Calculator</a>,
or other major vendor source as an approximation.
</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 Feedline Information</p>
</div>
<div class="mb-3">
<label for="feedtype">Feedline Type</label>
<input type="text" class="form-control" id="feedtype" name="feedtype" required>
</div>
<div class="mb-3">
<label for="feedunit">Feedline Unit of Measure</label>
<br><i>This calculator works with either feet or meters, but the feedline length
and the feedline losses per 100 units must be int he same unit of measurement
or the calculation will be in correct. </i>
<select class="form-select" aria-label="select duty cycle" id="feedunit" name="feedunit">
<option value="ft" label="ft" selected="selected">ft</option>
<option value="m" label="m">m</option>
</select>
</div>
<div class="mb-3">
<label for="feedlength">Feedline Length</label>
<br><i>Number only; maximum of one decimal place (e.g. 25.5) - Do not include any unit of meature (e.g. ft, m)</i>
<input type="text" class="form-control" id="feedlength" name="feedlength" required>
</div>
<div class="mb-3">
<label for="feedloss">Power Loss per 100 units of measure (dB)</label>
<br><i>Number only; maximum of one decimal place (e.g. 2.1) - Do not include "dB"</i>
<input type="text" class="form-control" id="feedloss" name="feedloss" required>
</div>
<div class="mb-3">
<button type="button" class="shadow" onclick="backClick('1')"><svg class="svgicon"><use href="#lt-chevron"></use></svg> Back</button>
<button type="button" class="shadow" onclick="nextClick('3')">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 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>
</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>