latest user manual PDF
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<p>If you connect the microphone input on your computer to your radio receiver, you can decode off air signals. If you have a rig interface, try configuring that as the <em>From Radio To Computer</em> device, with your computer’s sound card as the <em>From Computer To Speaker/Headphone</em> device.</p>
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<p>If you don’t have anyone to transmit FreeDV signals to you, try the test wave files in the next section.</p>
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<h2 id="test-wave-files"><span class="header-section-number">2.3</span> Test Wave Files</h2>
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<p>In https://github.com/drowe67/freedv-gui/tree/master/wav are audio files containing off-air FreeDV modem signals. There is one for each FreeDV mode. Select a FreeDV mode and press Start. Choose a file using “Tools - Start/Stop Play File From Radio”. You should hear decoded FreeDV speech.</p>
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<p>In the installation are audio files containing off-air FreeDV modem signals. There is one file per FreeDV mode and are in the following locations depending on platform:</p>
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<table>
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<thead>
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<tr class="header">
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<th>Platform</th>
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<th>Typical Location</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td>Windows</td>
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<td>C:\Program Files\FreeDV [version]\share\freedv-gui\wav</td>
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</tr>
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<tr class="even">
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<td>Linux</td>
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<td>/usr/share/freedv-gui/wav or /usr/local/share/freedv-gui/wav</td>
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</tr>
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<tr class="odd">
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<td>macOS</td>
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<td>See https://github.com/drowe67/freedv-gui/tree/master/wav</td>
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</tr>
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</tbody>
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</table>
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<p>To play these files, first select a FreeDV mode and press Start. Then choose a file using “Tools - Start/Stop Play File From Radio”. You should then hear decoded FreeDV speech.</p>
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<p>These files will give you a feel for what FreeDV signals sound like, and for the basic operation of the FreeDV software.</p>
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<h2 id="transmitreceive-two-sound-cards"><span class="header-section-number">2.4</span> Transmit/Receive (Two Sound Cards)</h2>
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<p>For Tx/Rx operation you need to configure two sound cards, by setting up Tools - Audio Config <em>Transmit</em> and <em>Receive</em> Tabs.</p>
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