From c6afb1c133cec77a61b9667bfb1404a0e565e17b Mon Sep 17 00:00:00 2001
From: Robert Scullin <rscullin@users.noreply.github.com>
Date: Sun, 25 Oct 2020 06:33:25 -0400
Subject: [PATCH] Fixes #815 - Change usable bandwidth percentage based on
 Airspy samplerate (#976)

---
 .../source/tuner/TunerController.java         |  8 ++++++++
 .../tuner/airspy/AirspyTunerController.java   | 19 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/main/java/io/github/dsheirer/source/tuner/TunerController.java b/src/main/java/io/github/dsheirer/source/tuner/TunerController.java
index c471d33e..e5de2e64 100644
--- a/src/main/java/io/github/dsheirer/source/tuner/TunerController.java
+++ b/src/main/java/io/github/dsheirer/source/tuner/TunerController.java
@@ -275,6 +275,14 @@ public abstract class TunerController implements Tunable, ISourceEventProcessor,
         return (int)(getBandwidth() * mUsableBandwidthPercentage);
     }
 
+    /**
+     * Sets the usable bandwidth percentage -- this can change based on samplerate for some tuners
+     */
+    public void setUsableBandwidthPercentage(double usableBandwidthPercentage)
+    {
+        mUsableBandwidthPercentage = usableBandwidthPercentage;
+    }
+
     /**
      * Usable half bandwidth - total bandwidth minus unusable space at either end of the spectrum.
      *
diff --git a/src/main/java/io/github/dsheirer/source/tuner/airspy/AirspyTunerController.java b/src/main/java/io/github/dsheirer/source/tuner/airspy/AirspyTunerController.java
index 4c493655..0487d1ab 100644
--- a/src/main/java/io/github/dsheirer/source/tuner/airspy/AirspyTunerController.java
+++ b/src/main/java/io/github/dsheirer/source/tuner/airspy/AirspyTunerController.java
@@ -406,6 +406,25 @@ public class AirspyTunerController extends USBTunerController
             {
                 mSampleRate = rate.getRate();
                 mFrequencyController.setSampleRate(mSampleRate);
+
+                // Update the Usable Bandwidth Percentage, as the usable range varies with the sample rate.
+                // Values below are from https://github.com/DSheirer/sdrtrunk/issues/815#issuecomment-699859590
+                switch(mSampleRate)
+                {
+                    default:
+                    case 10000000:
+                        super.setUsableBandwidthPercentage(0.90);
+                        break;
+                    case 6000000:
+                        super.setUsableBandwidthPercentage(0.83);
+                        break;
+                    case 3000000:
+                        super.setUsableBandwidthPercentage(0.66);
+                        break;
+                    case 2500000:
+                        super.setUsableBandwidthPercentage(0.60);
+                        break;
+                }
             }
         }
     }