Adds the Tuners wiki page for Version 0.3.0

Tuners_V0.3.0.md

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+**Version:** 0.3.0
+
+Tuners
+---
+The tuners tab lists all tuners currently recognized and available for use by the sdrtrunk
+application.  You can create one or more tuner configurations for each tuner and identify
+one of those configurations as the default configuration for the tuner.  The application 
+attempts to reconfigure your tuner to the same settings used the last time that you ran the
+software.
+
+![Figure 1: Tuners](images/Tuners_V0.3.0.png)
+**Figure 1:** Tuners View 
+
+The tuners view contains three sections with all available tuners listed in the top section, tuner 
+configurations listed in the lower-left panel and a tuner configuration editor panel in the 
+lower-right panel.
+
+Select a tuner row in the top table to view available tuner configurations in the lower-left.
+
+Select a tuner configuration in the lower-left table to view the tuner configuration editor panel
+in the lower right.
+
+Supported Tuners
+---
+The following tuners are currently supported by the SDRTrunk application.  Additional tuner support will 
+be added in the future.
+
+  * [Airspy](Airspy)
+  * [Funcube Dongle Pro](FuncubeDonglePro) (1.0)
+  * [Funcube Dongle Pro Plus](FuncubeDongleProPlus) (2.0)
+  * [HackRF](HackRF)
+  * [RTL-2832 with Elonics E4000](E4000)
+  * [RTL-2832 with Rafael Micro R820T or R820T2](R820T)
+
+Tuner Management
+---
+The application automatically manages all tuners as a pooled set of resources.  As you enable channels 
+for decoding, sdrtrunk polls each tuner to see if it can support the requested channel frequency, and 
+then assigns the channel to the tuner.  If no tuners can support the channel, then the channel will 
+not start and you will receive a popup message indicating that no tuners are available.
+
+Each tuner can source one or more channel frequencies so long as the set of channel frequencies fit 
+within the current center tuned frequency and bandwidth (sample rate) of the tuner.  As additional 
+channels are sourced by the tuner, the tuner controller will automatically adjust the center frequency 
+to provide a best-fit of all sourced channels, while ensuring that no channels overlap any 
+DC-spike that may be present in the center of the spectrum for some types of tuners.
+
+Tuners Table
+---
+All available tuners are detailed in the table at the top of the tuners view.  The following columns
+are included in the table:
+
+#### Tuner
+Description of the tuner model
+
+#### ID
+Identifier or serial number of the tuner
+
+#### Sample Rate
+Current sample rate setting for the tuner
+
+#### Frequency
+Current center tuned frequency of the tuner.  **Note:** the sdrtrunk application automatically adjusts
+the tuner's center tuned frequency according to the channels that are being sourced from the tuner.  You
+can adjust this frequency and each of the decoding channels will adjust their offset to compensate.  
+However, it's recommended to let the application manage this setting for you.
+
+#### Channels
+Number of decoding channels currently being sourced by the tuner.
+
+#### Spectral
+Provides a quick-link for showing the tuner in the primary spectral display.  Click the **Main**
+link in the row to show that tuner in the primary spectral display.
+
+#### Display
+Provides a quick-link to launch a new spectral display window for the tuner.  Click the **New**
+link in the row to create a new spectral display window for the tuner.
+
+**Note:** you can launch multiple windows for each tuner or combination of tuners.  However, each
+window adds to the overall processing workload for the computer and using too many spectral
+display windows may impair application performance.
+
+Tuner Configuration Table
+---
+The tuner configuration table lists all tuner configurations for the currently selected tuner.  This
+section includes a descriptive name for the tuner and a **Frequency** control for adjusting the 
+center tuned frequency for the currently selected tuner.  The following columns are included in 
+the tuner configuration table:
+
+#### Tuner Type
+Indicates the type of tuner for the configuration.
+
+#### Name
+Name of the tuner configuration
+
+#### Assigned
+Only one of the tuner configurations listed will contain an asterisk (*) indicating that the 
+configuration is the currently assigned configuration for the selected tuner.
+
+The following buttons allow you to manage your tuner configurations for the currently selected
+tuner:
+
+#### New Button
+Click to create a new tuner configuration for the selected tuner.
+
+#### Delete Button
+Click to delete the currently selected tuner configuration.  If you attempt to delete a 
+tuner configuration that is assigned to the currently selected tuner, a popup error 
+message will appear indicating that you have to assign another tuner configuration to
+the tuner before you can delete the currently selected tuner configuration.
+
+#### Assign Button
+Assigns the currently selected tuner configuration as the default configuration for the
+currently selected tuner.  The default configuration is used to configure the tuner 
+each time you start the application.
+
+Tuner Configuration Editor
+---
+Selecting a tuner configuration in the tuner configuration table will load the 
+corresponding editor for the tuner configuration and allow you to change settings
+for the tuner.  See each specific tuner type listed above in the **Supported Tuners**
+section for a listing of available settings.
+
+**Note:** any changes made to the default tuner configuration will be automatically
+applied to the currently selected tuner.