2020-04-09 23:09:33 -06:00
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<!DOCTYPE html>
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<html>
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2020-05-01 15:07:09 -06:00
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<head>
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<title>Vail</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- Material Design Lite -->
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<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
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<link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.teal-purple.min.css">
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<script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>
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<!-- Vail stuff -->
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2020-05-18 14:10:55 -06:00
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<link rel="icon" href="vail.png" sizes="128x128" type="image/png">
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<link rel="icon" href="vail.svg" sizes="any" type="image/svg+xml">
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2020-05-01 15:07:09 -06:00
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<script src="vail.js"></script>
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<link rel="stylesheet" href="vail.css">
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</head>
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<body>
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<div class="mdl-layout mdl-js-layout">
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<header class="mdl-layout__header mdl-layout__header--scroll">
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<div class="mdl-layout__header-row">
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<!-- Title -->
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<span class="mdl-layout-title">Vail</span>
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<!-- Add spacer, to align navigation to the right -->
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<div class="mdl-layout-spacer"></div>
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<!-- Navigation -->
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<nav class="mdl-navigation">
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<a class="mdl-navigation__link" href="https://github.com/nealey/vail">Source Code</a>
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<a class="mdl-navigation__link" href="https://github.com/nealey/vail/issues/new">Bug Report</a>
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2020-05-17 15:34:09 -06:00
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<a class="mdl-navigation__link" href="https://github.com/nealey/vail-adapter">USB Adapter</a>
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2020-05-01 15:07:09 -06:00
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<a class="mdl-navigation__link" href="https://morse.withgoogle.com/learn/">Learn Morse</a>
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</nav>
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</div>
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</header>
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<div class="mdl-layout__drawer">
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<span class="mdl-layout-title">Repeaters</span>
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<nav class="mdl-navigation">
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<a class="mdl-navigation__link" href="?repeater=">General Chaos</a>
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2020-05-17 16:58:07 -06:00
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<a class="mdl-navigation__link" href="?repeater=1-15+WPM">1-15 WPM</a>
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<a class="mdl-navigation__link" href="?repeater=16-20+WPM">16-20 WPM</a>
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<a class="mdl-navigation__link" href="?repeater=21-99+WPM">21-99 WPM</a>
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2020-05-01 15:07:09 -06:00
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</nav>
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<hr>
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<nav class="mdl-navigation">
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<a class="mdl-navigation__link" href="https://morse.withgoogle.com/learn/">Learn Morse Code</a>
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2020-05-17 12:52:25 -06:00
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<a class="mdl-navigation__link" href="https://github.com/nealey/vail-adapter">Use a physical key</a>
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2020-05-01 15:07:09 -06:00
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</nav>
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</div>
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2020-05-17 12:52:25 -06:00
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<div id="snackbar" class="mdl-js-snackbar mdl-snackbar">
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<div class="mdl-snackbar__text"></div>
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<button class="mdl-snackbar__action" type="button"></button>
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</div>
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2020-05-01 15:07:09 -06:00
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<main class="mdl-layout__content">
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<div class="flex">
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2020-05-17 12:52:25 -06:00
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<div class="mdl-card mdl-shadow--4dp">
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2020-05-01 15:07:09 -06:00
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<div class="mdl-card__title">
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<h2 class="mdl-card__title-text">Input</h2>
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</div>
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<div class="mdl-tabs mdl-js-tabs mdl-js-ripple-effect">
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<div class="mdl-tabs__tab-bar">
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<a href="#straight" class="mdl-tabs__tab is-active">Straight Key</a>
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<a href="#iambic" class="mdl-tabs__tab">Iambic</a>
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<a href="#tools" class="mdl-tabs__tab">Tools</a>
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</div>
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<div class="mdl-tabs__panel is-active" id="straight">
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<table class="center wide">
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<tr>
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<td>
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<button id="key" class="key mdl-button mdl-js-button mdl-button--raised mdl-button--colored">
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Key
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</button>
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</td>
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</tr>
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<tr>
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<td>
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<kbd>c</kbd> or <kbd>,</kbd> or <kbd>⇧ Shift</kbd>
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</td>
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</tr>
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</table>
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</div>
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<div class="mdl-tabs__panel" id="iambic">
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<table class="center wide">
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<tr>
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<td>
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<button id="dit" class="key mdl-button mdl-js-button mdl-button--raised mdl-button--colored">
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Dit
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</button>
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</td>
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<td>
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<button id="dah" class="key mdl-button mdl-js-button mdl-button--raised mdl-button--colored">
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Dah
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</button>
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</td>
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</tr>
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<tr>
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<td>
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<kbd>.</kbd> or <kbd>z</kbd>
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2020-05-17 12:52:25 -06:00
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<br>
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right-click for Dah
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2020-05-01 15:07:09 -06:00
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</td>
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<td>
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<kbd>/</kbd> or <kbd>x</kbd>
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</td>
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</tr>
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</table>
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</div>
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<div class="mdl-tabs__panel" id="tools">
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<table class="center wide">
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<tr>
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<td>
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<button id="ck" class="key mdl-button mdl-js-button mdl-button--raised mdl-button--colored">
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CK
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</button>
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</td>
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</tr>
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<tr>
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<td>Echo On</td>
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</tr>
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</table>
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</div>
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2020-05-17 15:34:09 -06:00
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<div class="mdl-card__actions">
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<button class="mdl-button mdl-js-button mdl-button--fab mdl-button--mini-fab mdl-button--colored maximize" title="maximize">
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<i class="material-icons mdl-color-text--white" role="presentation">aspect_ratio</i>
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</button>
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</div>
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2020-05-01 15:07:09 -06:00
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</div>
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</div>
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<div class="mdl-card mdl-shadow--4dp">
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<div class="mdl-card__title">
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2020-05-17 16:58:07 -06:00
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<h2 class="mdl-card__title-text">Alphabet</h2>
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2020-05-01 15:07:09 -06:00
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</div>
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2020-05-17 16:58:07 -06:00
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<div class="mdl-tabs mdl-js-tabs mdl-js-ripple-effect">
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<div class="mdl-tabs__tab-bar">
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<a href="#morse-tree" class="mdl-tabs__tab is-active">Dichotomous Key</a>
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<a href="#morse-list" class="mdl-tabs__tab">List</a>
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</div>
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<div class="mdl-tabs__panel is-active" id="morse-tree">
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<table>
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<tbody>
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<tr>
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<td rowspan="8">e .</td>
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<td rowspan="4">i ..</td>
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<td rowspan="2">s ...</td>
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<td rowspan="1">h ....</td>
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</tr>
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<tr>
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<td rowspan="1">v ...-</td>
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</tr>
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<tr>
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<td rowspan="2">u ..-</td>
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<td rowspan="1">f ..-.</td>
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</tr>
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<tr>
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<td rowspan="1"></td>
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</tr>
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<tr>
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<td rowspan="4">a .-</td>
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<td rowspan="2">r .-.</td>
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<td rowspan="1">l .-..</td>
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</tr>
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<tr>
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2020-05-18 14:10:55 -06:00
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<td rowspan="1"></td>
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2020-05-17 16:58:07 -06:00
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</tr>
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<tr>
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<td rowspan="2">w .--</td>
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<td rowspan="1">p .--.</td>
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</tr>
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<tr>
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2020-05-18 14:10:55 -06:00
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<td rowspan="1">j .---</td>
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2020-05-17 16:58:07 -06:00
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</tr>
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2020-05-17 12:52:25 -06:00
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2020-05-17 16:58:07 -06:00
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<tr>
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<td rowspan="8">t -</td>
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<td rowspan="4">n -.</td>
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<td rowspan="2">d -..</td>
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<td rowspan="1">b -...</td>
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</tr>
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<tr>
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<td rowspan="1">x -..-</td>
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</tr>
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<tr>
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<td rowspan="2">k -.-</td>
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<td rowspan="1">c -.-.</td>
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</tr>
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<tr>
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<td rowspan="1">y -.--</td>
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</tr>
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<tr>
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<td rowspan="4">m --</td>
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<td rowspan="2">g --.</td>
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<td rowspan="1">z --..</td>
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</tr>
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<tr>
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<td rowspan="1">q --.-</td>
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</tr>
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<tr>
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<td rowspan="2">o ---</td>
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<td rowspan="1"></td>
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</tr>
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<tr>
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<td rowspan="1"></td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="mdl-tabs__panel" id="morse-list">
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<span>a .-</span>
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<span>b -...</span>
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<span>c -.-.</span>
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<span>d -..</span>
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<span>e .</span>
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<span>f ..-.</span>
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<span>g --.</span>
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<span>h ....</span>
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<span>i ..</span>
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<span>j .---</span>
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<span>k -.-</span>
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<span>l .-..</span>
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<span>m --</span>
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<span>n -.</span>
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<span>o ---</span>
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<span>p .--.</span>
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<span>q --.-</span>
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<span>r .-.</span>
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<span>s ...</span>
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<span>t -</span>
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<span>u ..-</span>
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<span>v ...-</span>
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<span>w .--</span>
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<span>x -..-</span>
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<span>y -.--</span>
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<span>z --..</span>
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</div>
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</div>
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2020-05-17 15:34:09 -06:00
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</div>
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<div class="mdl-card mdl-shadow--4dp">
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<div class="mdl-card__title">
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<h2 class="mdl-card__title-text">Knobs</h2>
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</div>
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<div class="mdl-card__supporting-text">
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<p>
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Dit length (iambic):
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<output id="iambic-duration-value"></output>ms
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<input
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id="iambic-duration"
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class="mdl-slider mdl-js-slider"
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type="range"
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min="40"
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max="255"
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value="100">
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</p>
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<p>
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Recieve delay:
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<output id="rx-delay-value"></output>ms
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<input
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id="rx-delay"
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class="mdl-slider mdl-js-slider"
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type="range"
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min="0"
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max="9999"
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value="4000">
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</p>
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<hr>
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<table>
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<tbody>
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<tr>
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<td>
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Suggested receive delay:
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</td>
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<td>
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<output id="suggested-delay-value">0</output>ms
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</td>
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</tr>
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<tr>
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<td>
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Average round-trip time:
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</td>
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<td>
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<output id="lag-value">0</output>ms
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</td>
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</tr>
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<tr>
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<td>
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Longest recent transmission:
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</td>
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<td>
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<output id="longest-rx-value">0</output>ms
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</td>
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</tr>
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<tr>
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<td>
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Repeater:
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</td>
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<td>
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<span id="repeater"></span>
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</td>
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</tr>
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</tbody>
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</table>
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2020-05-01 15:07:09 -06:00
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</div>
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</div>
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<div class="mdl-card mdl-shadow--4dp">
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<div class="mdl-card__title">
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<h2 class="mdl-card__title-text">Vail</h2>
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</div>
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<div class="mdl-card__supporting-text">
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<p>
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This is a CW repeater,
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named after Alfred Vail,
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who may or may not have invented what's called "Morse code",
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but clearly had some role in it.
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</p>
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<p>
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Just like a radio repeater,
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anybody can connect and start transmitting stuff,
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and this will broadcast it to everyone connected.
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</p>
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<h3 class="mdl-card__title-text">Why Does This Exist?</h3>
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<p>
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I need a place to practice CW with actual human beings,
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and I want it to be as close as possible to what I'd experience on a radio.
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Also, I don't want to make people buy a bunch of radio hardware.
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Nothing else like this exists on the Internet, as far as I can tell.
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</p>
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</div>
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</div>
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<div class="mdl-card mdl-shadow--4dp">
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<div class="mdl-card__title">
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<h2 class="mdl-card__title-text">How It Works</h2>
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</div>
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<div class="mdl-card__supporting-text">
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<p>
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The Internet isn't exactly like radio waves:
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it still goes at near the speed of light,
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but there are multiple hops between endpoints,
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which buffer up transmissions, and multiplex them onto a single uplink connection.
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These repeaters (routers)
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are also allowed to just drop things if they need to.
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It's the responsibility of the communicating parties
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to work out whether something needs to be retransmitted.
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Because of this,
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there's no telling how long it will take for a transmission to get to a destination.
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</p>
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<p>
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Each Vail transmission (packet) consists of:
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</p>
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<ul>
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<li>timestamp (milliseconds since 1 Jan 1970, 00:00:00 in Reykjavík)</li>
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<li>transmission duration (milliseconds)</li>
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<li>silence duration (milliseconds, optional)</li>
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<li>transmission duration (milliseconds, optional)</li>
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<li>silence duration (milliseconds, optional)</li>
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<li>Repeat as necessary</li>
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</ul>
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<p>
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The repeater does nothing but broadcast everything it gets
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to every connected Vail client,
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including the one that sent the packet.
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When your client gets back the exact same thing it sent,
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it compares the current time to the time in the packet.
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This is the <i>round-trip time</i>:
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the time it takes for a packet to get from your computer to the repeater and back.
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</p>
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<p>
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When the client gets a packet it didn't send,
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it adds the <i>receive delay</i> to the timestamp,
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and schedules to play the tones and silences in the packet
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at that time.
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</p>
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<p>
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By adding the maximum round-trip time to the <i>longest recent transmission</i>
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(the length of a dah, hopefully),
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your client can make a guess about how much time needs to be added to a received timestamp,
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in order to have it play back in the future at the time it comes in.
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This is just a guess.
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If you're communicating with somebody with a higher round-trip time than you have,
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you'll need to raise your receive delay to account for it.
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</p>
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</div>
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</div>
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<div class="mdl-card mdl-shadow--4dp">
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<div class="mdl-card__title">
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<h2 class="mdl-card__title-text">Why do I hear a low tone?</h2>
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</div>
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<div class="mdl-card__supporting-text">
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<p>
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This is the "drop tone", and will be accompanied by an error.
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</p>
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<p>
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This means the packet arrived so late, it can't be played in time.
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In technical terms: the timestamp of the packet plus the receive delay
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is less than the current time.
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It can't be scheduled to play, because we can't go back in time.
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</p>
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<p>
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This could be happening for three reasons:
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</p>
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<ol>
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<li>You (the person hearing the drop tone) need a larger receive delay</li>
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<li>The receiving computer's clock is in the future (running fast)</li>
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<li>The sending computer's clock is in the past (running slow)</li>
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</ol>
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<p>
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Make sure your clock is synced with an Internet time server.
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Accurate time is very important to how Vail works.
|
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</p>
|
|
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|
|
</div>
|
|
|
|
|
</div>
|
2020-05-17 12:52:25 -06:00
|
|
|
|
|
|
|
|
<div class="mdl-card mdl-shadow--4dp">
|
|
|
|
|
<div class="mdl-card__title">
|
|
|
|
|
<h2 class="mdl-card__title-text">Future plans</h2>
|
|
|
|
|
</div>
|
|
|
|
|
<div class="mdl-card__supporting-text">
|
|
|
|
|
<ul>
|
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|
<li>Move to a more permanent URL</li>
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<li>Make this page less ugly</li>
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<li>Arduino program to let you hook up an iambic paddle over USB</li>
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<li>Document the protocol</li>
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</ul>
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|
|
<h3 class="mdl-card__title-text">How can I help?</h3>
|
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<ul>
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<li>Improve the <a href="https://github.com/nealey/vail/">source code</a></li>
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<li>Email me and let me know you're using it</li>
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</ul>
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<p>
|
|
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|
|
<a href="mailto:neale@woozle.org">Neale Pickett</a> kd7oqi
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
2020-05-01 15:07:09 -06:00
|
|
|
</div>
|
|
|
|
|
</main>
|
|
|
|
|
</div>
|
|
|
|
|
</body>
|
2020-04-10 10:23:40 -06:00
|
|
|
</html>
|
