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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2020-05-26 20:52:48 -06:00
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<link rel="manifest" href="manifest.json">
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<link rel="icon" href="vail.png" sizes="256x256" type="image/png">
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<link rel="icon" href="vail.svg" sizes="any" type="image/svg+xml">
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2021-04-26 16:09:03 -06:00
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<script type="module" src="vail.mjs"></script>
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2020-05-01 15:07:09 -06:00
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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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2021-04-27 18:37:25 -06:00
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<span class="mdl-layout-title">Local Practice</span>
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<nav class="mdl-navigation">
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<a class="mdl-navigation__link" href="?repeater=Fortunes">Fortunes</a>
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<a class="mdl-navigation__link" href="?repeater=Fortunes: Pauses ×2">Fortunes (slow)</a>
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<a class="mdl-navigation__link" href="?repeater=Fortunes: Pauses ×4">Fortunes (very slow)</a>
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<a class="mdl-navigation__link" href="?repeater=Fortunes: Pauses ×6">Fortunes (very very slow)</a>
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<a class="mdl-navigation__link" href="?repeater=Fortunes: Pauses ×10">Fortunes (crazy slow)</a>
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</nav>
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2021-04-27 12:42:06 -06:00
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<nav class="mdl-navigation">
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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 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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2020-05-20 22:56:22 -06:00
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<div class="mdl-card mdl-shadow--4dp input-methods">
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2021-04-27 12:42:06 -06:00
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<div id="recv">
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<!-- This div appears as a little light that turns on when someone's sending -->
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<i class="material-icons" id="muted">volume_off</i>
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</div>
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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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2020-06-01 19:55:28 -06:00
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<h2 class="mdl-card__title-text">
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2021-04-27 12:42:06 -06:00
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<div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
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<input class="mdl-textfield__input" type="text" id="repeater" list="repeater-list">
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<datalist id="repeater-list">
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<option>General Chaos</option>
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<option>1-15 WPM</option>
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<option>16-20 WPM</option>
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<option>21+ WPM</option>
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2021-04-27 18:37:25 -06:00
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<option>Fortunes: Pauses ×8</option>
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<option>Fortunes: Pauses ×4</option>
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<option>Fortunes: Pauses ×2</option>
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<option>Fortunes</option>
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2021-04-27 12:42:06 -06:00
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</datalist>
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<label class="mdl-textfield__label" for="repeater">Repeater</label>
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</div>
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2020-06-01 19:55:28 -06:00
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</h2>
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2020-05-01 15:07:09 -06:00
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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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2020-05-20 22:56:22 -06:00
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<td colspan="2">
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2020-05-01 15:07:09 -06:00
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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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2020-05-20 22:56:22 -06:00
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<td>
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<i class="material-icons" role="presentation">keyboard</i>
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</td>
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2020-05-01 15:07:09 -06:00
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<td>
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2020-05-19 08:21:33 -06:00
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<kbd>c</kbd>
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<kbd>,</kbd>
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<kbd>Enter</kbd>
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2020-05-20 22:56:22 -06:00
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</td>
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</tr>
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<tr>
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<td>
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<i class="material-icons" role="presentation">gamepad</i>
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</td>
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<td>
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2021-04-26 16:09:03 -06:00
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<img class="gamepad b0" title="Gamepad Bottom Button" src="b0.svg" alt="Bottom button">
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<img class="gamepad b1" title="Gamepad Right Button" src="b1.svg" alt="Right button">
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2020-05-01 15:07:09 -06:00
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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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2020-05-20 22:56:22 -06:00
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<td colspan="2">
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2020-05-01 15:07:09 -06:00
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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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2020-05-20 22:56:22 -06:00
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<td colspan="2">
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2020-05-01 15:07:09 -06:00
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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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2020-05-20 22:56:22 -06:00
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<td>
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<i class="material-icons" role="presentation">keyboard</i>
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</td>
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2020-05-01 15:07:09 -06:00
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<td>
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2020-05-19 08:21:33 -06:00
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<kbd>.</kbd>
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2020-05-21 20:38:44 -06:00
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<kbd>x</kbd>
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2020-05-20 22:56:22 -06:00
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</td>
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<td>
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<i class="material-icons" role="presentation">keyboard</i>
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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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2020-05-19 08:21:33 -06:00
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<kbd>/</kbd>
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2020-05-21 20:38:44 -06:00
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<kbd>z</kbd>
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2020-05-20 22:56:22 -06:00
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</td>
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</tr>
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<tr>
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<td>
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<i class="material-icons" role="presentation">gamepad</i>
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</td>
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<td>
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2021-04-26 16:09:03 -06:00
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<img class="gamepad b2" title="Gamepad Left Button" src="b2.svg" alt="Left Button">
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<kbd class="gamepad" title="Gamepad Left Shoulder Button">LB</kbd>
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2020-05-20 22:56:22 -06:00
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</td>
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<td>
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<i class="material-icons" role="presentation">gamepad</i>
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</td>
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<td>
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2021-04-26 16:09:03 -06:00
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<img class="gamepad b3" title="Gamepad Top Button" src="b3.svg" alt="Top Button">
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<kbd class="gamepad" title="Gamepad Right Shoulder Button">RB</kbd>
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2020-05-01 15:07:09 -06:00
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</td>
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</tr>
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2020-05-20 22:56:22 -06:00
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<tr>
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<td colspan="4" class="mdl-card__supporting-text" style="text-align: center;">
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Second mouse button: Dah
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</td>
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</tr>
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2020-05-01 15:07:09 -06:00
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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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2021-04-27 17:30:16 -06:00
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<div class="flex mdl-card__supporting-text">
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<button id="ck" class="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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<p>
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Send <code>CK</code> (check) to the repeater, and play when it comes back.
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</p>
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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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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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2020-05-21 20:32:36 -06:00
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<div class="mdl-tabs__panel mdl-card__supporting-text long is-active" id="morse-tree">
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2020-05-17 16:58:07 -06:00
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<table>
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<tbody>
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<tr>
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2020-05-19 12:15:36 -06:00
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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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2020-05-21 20:32:36 -06:00
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<td class="dah">4 ....-</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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2020-05-19 12:15:36 -06:00
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<td rowspan="1">V ...-</td>
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2020-05-21 20:32:36 -06:00
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<td class="dah">3 ...--</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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2020-05-19 12:15:36 -06:00
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<td rowspan="2">U ..-</td>
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<td rowspan="1">F ..-.</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="1"></td>
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2020-05-21 20:32:36 -06:00
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<td class="dah">2 ..---</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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2020-05-19 12:15:36 -06:00
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<td rowspan="4">A .-</td>
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<td rowspan="2">R .-.</td>
|
|
|
|
|
|
<td rowspan="1">L .-..</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-18 14:10:55 -06:00
|
|
|
|
<td rowspan="1"></td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="2">W .--</td>
|
|
|
|
|
|
<td rowspan="1">P .--.</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="1">J .---</td>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<td class="dah">1 .----</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
2020-05-17 12:52:25 -06:00
|
|
|
|
|
2020-05-17 16:58:07 -06:00
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="8">T -</td>
|
|
|
|
|
|
<td rowspan="4">N -.</td>
|
|
|
|
|
|
<td rowspan="2">D -..</td>
|
|
|
|
|
|
<td rowspan="1">B -...</td>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<td>6 -....</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="1">X -..-</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="2">K -.-</td>
|
|
|
|
|
|
<td rowspan="1">C -.-.</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="1">Y -.--</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="4">M --</td>
|
|
|
|
|
|
<td rowspan="2">G --.</td>
|
|
|
|
|
|
<td rowspan="1">Z --..</td>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<td>7 --...</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="1">Q --.-</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<td rowspan="2">O ---</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
<td rowspan="1"></td>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<td>8 ---..</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td rowspan="1"></td>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<td>9 ----.</td>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
|
|
|
|
</table>
|
|
|
|
|
|
</div>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<div class="mdl-tabs__panel mdl-card__supporting-text long" id="morse-list">
|
2020-05-19 12:15:36 -06:00
|
|
|
|
<span>A .-</span>
|
|
|
|
|
|
<span>B -...</span>
|
|
|
|
|
|
<span>C -.-.</span>
|
|
|
|
|
|
<span>D -..</span>
|
|
|
|
|
|
<span>E .</span>
|
|
|
|
|
|
<span>F ..-.</span>
|
|
|
|
|
|
<span>G --.</span>
|
|
|
|
|
|
<span>H ....</span>
|
|
|
|
|
|
<span>I ..</span>
|
|
|
|
|
|
<span>J .---</span>
|
|
|
|
|
|
<span>K -.-</span>
|
|
|
|
|
|
<span>L .-..</span>
|
|
|
|
|
|
<span>M --</span>
|
|
|
|
|
|
<span>N -.</span>
|
|
|
|
|
|
<span>O ---</span>
|
|
|
|
|
|
<span>P .--.</span>
|
|
|
|
|
|
<span>Q --.-</span>
|
|
|
|
|
|
<span>R .-.</span>
|
|
|
|
|
|
<span>S ...</span>
|
|
|
|
|
|
<span>T -</span>
|
|
|
|
|
|
<span>U ..-</span>
|
|
|
|
|
|
<span>V ...-</span>
|
|
|
|
|
|
<span>W .--</span>
|
|
|
|
|
|
<span>X -..-</span>
|
|
|
|
|
|
<span>Y -.--</span>
|
|
|
|
|
|
<span>Z --..</span>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<br>
|
|
|
|
|
|
<span>0 -----</span>
|
|
|
|
|
|
<span>1 .----</span>
|
|
|
|
|
|
<span>2 ..---</span>
|
|
|
|
|
|
<span>3 ...--</span>
|
|
|
|
|
|
<span>4 ....-</span>
|
|
|
|
|
|
<span>5 .....</span>
|
|
|
|
|
|
<span>6 -....</span>
|
|
|
|
|
|
<span>7 --...</span>
|
|
|
|
|
|
<span>8 ---..</span>
|
|
|
|
|
|
<span>9 ----.</span>
|
|
|
|
|
|
<br>
|
2021-04-26 17:55:46 -06:00
|
|
|
|
<span>End of transmission .-.-.</span>
|
|
|
|
|
|
<span>Over -.-</span>
|
2020-05-21 20:32:36 -06:00
|
|
|
|
<span>Correction ........</span>
|
|
|
|
|
|
<span>? / Say Again ..--..</span>
|
2020-05-17 16:58:07 -06:00
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
2020-05-17 15:34:09 -06:00
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div class="mdl-card mdl-shadow--4dp">
|
|
|
|
|
|
<div class="mdl-card__title">
|
|
|
|
|
|
<h2 class="mdl-card__title-text">Knobs</h2>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
<div class="mdl-card__supporting-text">
|
|
|
|
|
|
<p>
|
|
|
|
|
|
Dit length (iambic):
|
|
|
|
|
|
<output id="iambic-duration-value"></output>ms
|
|
|
|
|
|
<input
|
|
|
|
|
|
id="iambic-duration"
|
|
|
|
|
|
class="mdl-slider mdl-js-slider"
|
|
|
|
|
|
type="range"
|
|
|
|
|
|
min="40"
|
|
|
|
|
|
max="255"
|
|
|
|
|
|
value="100">
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<p>
|
2021-04-27 12:42:06 -06:00
|
|
|
|
Receive delay:
|
2020-05-17 15:34:09 -06:00
|
|
|
|
<output id="rx-delay-value"></output>ms
|
|
|
|
|
|
<input
|
|
|
|
|
|
id="rx-delay"
|
|
|
|
|
|
class="mdl-slider mdl-js-slider"
|
|
|
|
|
|
type="range"
|
|
|
|
|
|
min="0"
|
|
|
|
|
|
max="9999"
|
|
|
|
|
|
value="4000">
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<hr>
|
|
|
|
|
|
<table>
|
|
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
Suggested receive delay:
|
|
|
|
|
|
</td>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
<output id="suggested-delay-value">0</output>ms
|
|
|
|
|
|
</td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
Average round-trip time:
|
|
|
|
|
|
</td>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
<output id="lag-value">0</output>ms
|
|
|
|
|
|
</td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
Longest recent transmission:
|
|
|
|
|
|
</td>
|
|
|
|
|
|
<td>
|
|
|
|
|
|
<output id="longest-rx-value">0</output>ms
|
|
|
|
|
|
</td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>
|
2020-06-01 19:55:28 -06:00
|
|
|
|
Your clock is off by:
|
2020-05-17 15:34:09 -06:00
|
|
|
|
</td>
|
|
|
|
|
|
<td>
|
2020-06-01 19:55:28 -06:00
|
|
|
|
<output id="clock-off-value">??</output>ms
|
2020-05-17 15:34:09 -06:00
|
|
|
|
</td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
|
|
|
|
</table>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div class="mdl-card mdl-shadow--4dp">
|
|
|
|
|
|
<div class="mdl-card__title">
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<h2 class="mdl-card__title-text">Documentation</h2>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
</div>
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<div class="mdl-tabs mdl-js-tabs mdl-js-ripple-effect">
|
|
|
|
|
|
<div class="mdl-tabs__tab-bar">
|
|
|
|
|
|
<a href="#doc-about" class="mdl-tabs__tab is-active">About</a>
|
|
|
|
|
|
<a href="#doc-faq" class="mdl-tabs__tab">FAQ</a>
|
|
|
|
|
|
<a href="#doc-geek" class="mdl-tabs__tab">Geek Stuff</a>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
<div class="mdl-tabs__panel mdl-card__supporting-text long is-active" id="doc-about">
|
|
|
|
|
|
<p>
|
|
|
|
|
|
This is a CW repeater,
|
|
|
|
|
|
named after Alfred Vail,
|
|
|
|
|
|
who may or may not have invented what's called "Morse code",
|
|
|
|
|
|
but clearly had some role in it.
|
|
|
|
|
|
</p>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<p>
|
|
|
|
|
|
Just like a radio repeater,
|
|
|
|
|
|
anybody can connect and start transmitting stuff,
|
|
|
|
|
|
and this will broadcast it to everyone connected.
|
|
|
|
|
|
</p>
|
|
|
|
|
|
</div>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<div class="mdl-tabs__panel mdl-card__supporting-text long" id="doc-faq">
|
|
|
|
|
|
<h3 class="mdl-card__title-text">Why Does This Exist?</h3>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
I needed a place to practice CW with actual human beings,
|
|
|
|
|
|
and I wanted it to be as close as possible to what I'd experience on a radio.
|
|
|
|
|
|
I also didn't have a lot of money to spend on equipment, but I did have a computer, phone, and gamepad.
|
|
|
|
|
|
Nothing else like this exists on the Internet, as far as I can tell.
|
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
<h3 class="mdl-card__title-text">Why do I hear a low tone?</h3>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
This is the "drop tone", and will be accompanied by an error.
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
This means the packet arrived so late, it can't be played in time.
|
|
|
|
|
|
In technical terms: the timestamp of the packet plus the receive delay
|
|
|
|
|
|
is less than the current time.
|
|
|
|
|
|
It can't be scheduled to play, because we can't go back in time.
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
This could be happening for three reasons:
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<ol>
|
|
|
|
|
|
<li>You (the person hearing the drop tone) need a larger receive delay</li>
|
|
|
|
|
|
<li>The receiving computer's clock is in the future (running fast)</li>
|
|
|
|
|
|
<li>The sending computer's clock is in the past (running slow)</li>
|
|
|
|
|
|
</ol>
|
|
|
|
|
|
<p>
|
2021-04-27 17:30:16 -06:00
|
|
|
|
Vail attempts to correct for clock differences,
|
|
|
|
|
|
but making sure your computer has correct time,
|
|
|
|
|
|
down to the millisecond,
|
|
|
|
|
|
can help with reliability.
|
2021-04-27 12:42:06 -06:00
|
|
|
|
</p>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<h3 class="mdl-card__title-text">How can I help?</h3>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li>Improve the <a href="https://github.com/nealey/vail/">source code</a></li>
|
|
|
|
|
|
<li>Email me and let me know you're using it</li>
|
|
|
|
|
|
<li>Vail costs me 50¢ a year to run: you could buy me a cup of coffee every 5 years or so to offset the expense</li>
|
|
|
|
|
|
</ul>
|
2020-05-01 15:07:09 -06:00
|
|
|
|
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<h3 class="mdl-card__title-text">Who made this?</h3>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
<a href="mailto:neale@woozle.org">Neale Pickett</a> kd7oqi
|
|
|
|
|
|
</p>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
2020-05-01 15:07:09 -06:00
|
|
|
|
|
2021-04-27 12:42:06 -06:00
|
|
|
|
<div class="mdl-tabs__panel mdl-card__supporting-text long" id="doc-geek">
|
|
|
|
|
|
<p>
|
|
|
|
|
|
The Internet isn't exactly like radio waves:
|
|
|
|
|
|
it still goes at near the speed of light,
|
|
|
|
|
|
but there are multiple hops between endpoints,
|
|
|
|
|
|
which buffer up transmissions, and multiplex them onto a single uplink connection.
|
|
|
|
|
|
These repeaters (routers)
|
|
|
|
|
|
are also allowed to just drop things if they need to.
|
|
|
|
|
|
It's the responsibility of the communicating parties
|
|
|
|
|
|
to work out whether something needs to be retransmitted.
|
|
|
|
|
|
Because of this,
|
|
|
|
|
|
there's no telling how long it will take for a transmission to get to a destination.
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
Each Vail transmission (packet) consists of:
|
|
|
|
|
|
</p>
|
|
|
|
|
|
<ul>
|
|
|
|
|
|
<li>timestamp (milliseconds since 1 Jan 1970, 00:00:00 in Reykjavík)</li>
|
|
|
|
|
|
<li>transmission duration (milliseconds)</li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<p>
|
|
|
|
|
|
The repeater does nothing but broadcast everything it gets
|
|
|
|
|
|
to every connected Vail client,
|
|
|
|
|
|
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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2020-05-01 15:07:09 -06:00
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</div>
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</div>
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2020-05-17 12:52:25 -06:00
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2020-05-01 15:07:09 -06:00
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</div>
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</main>
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</div>
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</body>
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2020-04-10 10:23:40 -06:00
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</html>
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2020-05-20 22:56:22 -06:00
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<!-- vim: set noet ts=2 sw=2 : -->
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