Updates the R820T/2 tuner wiki entry for version 0.3.0

R820T_V0.3.0.md

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+**Version:** 0.3.0
+
+RTL-2832 R820T and R820T2 Tuner Configuration
+---
+
+![Figure 1: R820T Tuner Configuration](images/R820T_V0.3.0.png)
+
+**Figure 1:** R820T Tuner Configuration
+
+The following settings shown in Figure 1 are available for configuring the tuner:
+
+#### Name
+Name for the tuner configuration. 
+
+#### Tuner Info Button
+Provides a summary of details about the currently selected tuner, including USB ID, Vendor, Product, 
+Serial number, IR status, and Remote Wake status.
+
+#### Sample Rate
+Allows you to change the sample rate.
+
+#### PPM
+Adjusts the frequency correction Parts Per Million (PPM) value for the tuner.  Airspy normally
+provides fairly stable frequency accuracy and this value can be left at 0.0.  If you notice in
+the spectral display that the frequency labels are slightly misaligned to observed signals, you
+can adjust this value to align the frequency to the observed signals with known operating 
+frequencies.
+
+#### Master Gain
+Sets the overall gain for the tuner and automatically controls the individual gain controls.  Use 
+the **Manual** setting to enable and independently change the LNA, Mixer and Enhance gain controls
+
+#### LNA Gain
+Sets the LNA gain.  Place the Master Gain into **Manual** mode to enable this control.
+
+#### Mixer Gain
+Sets the Mixer gain.  Place the Master Gain into **Manual** mode to enable this control.
+
+#### Enhance Gain
+Sets the Enhance gain.  Place the Master Gain into **Manual** mode to enable this control.