diff --git a/qspectrumanalyzer/__main__.py b/qspectrumanalyzer/__main__.py
index 0a2d33a..a61562f 100755
--- a/qspectrumanalyzer/__main__.py
+++ b/qspectrumanalyzer/__main__.py
@@ -53,6 +53,14 @@ class QSpectrumAnalyzerSettings(QtGui.QDialog, Ui_QSpectrumAnalyzerSettings):
     def on_backendComboBox_currentIndexChanged(self, text):
         """Change executable when backend is changed"""
         self.executableEdit.setText(text)
+        if text == "hackrf_sweep":
+            self.sampleRateSpinBox.setMinimum(20000000)
+            self.sampleRateSpinBox.setMaximum(20000000)
+            self.sampleRateSpinBox.setValue(20000000)
+        else:
+            self.sampleRateSpinBox.setMinimum(0)
+            self.sampleRateSpinBox.setMaximum(25000000)
+            self.sampleRateSpinBox.setValue(2560000)
 
     def accept(self):
         """Save settings when dialog is accepted"""
@@ -185,11 +193,74 @@ class QSpectrumAnalyzerMainWindow(QtGui.QMainWindow, Ui_QSpectrumAnalyzerMainWin
 
         backend = settings.value("backend", "rtl_power")
         if backend == "rtl_power_fftw":
+            self.gainSpinBox.setMinimum(-1)
+            self.gainSpinBox.setMaximum(49)
+            self.gainSpinBox.setValue(-1)
+            self.startFreqSpinBox.setMinimum(24)
+            self.startFreqSpinBox.setMaximum(1766)
+            self.startFreqSpinBox.setValue(87)
+            self.stopFreqSpinBox.setMinimum(24)
+            self.stopFreqSpinBox.setMaximum(1766)
+            self.stopFreqSpinBox.setValue(108)
+            self.binSizeSpinBox.setMinimum(0)
+            self.binSizeSpinBox.setMaximum(2800)
+            self.binSizeSpinBox.setValue(10)
+            self.intervalSpinBox.setMinimum(0)
+            self.intervalSpinBox.setMaximum(999)
+            self.intervalSpinBox.setValue(10)
+            self.ppmSpinBox.setMinimum(-999)
+            self.ppmSpinBox.setMaximum(999)
+            self.ppmSpinBox.setValue(0)
+            self.cropSpinBox.setMinimum(0)
+            self.cropSpinBox.setMaximum(99)
+            self.cropSpinBox.setValue(0)
             self.rtl_power_thread = RtlPowerFftwThread(self.data_storage)
         elif backend == "hackrf_sweep":
+            self.gainSpinBox.setMinimum(0)
+            self.gainSpinBox.setMaximum(102)
+            self.gainSpinBox.setValue(40)
+            self.startFreqSpinBox.setMinimum(0)
+            self.startFreqSpinBox.setMaximum(7230)
+            self.startFreqSpinBox.setValue(0)
+            self.stopFreqSpinBox.setMinimum(0)
+            self.stopFreqSpinBox.setMaximum(7250)
+            self.stopFreqSpinBox.setValue(6000)
+            self.binSizeSpinBox.setMinimum(40)
+            self.binSizeSpinBox.setMaximum(5000)
+            self.binSizeSpinBox.setValue(1000)
+            self.intervalSpinBox.setMinimum(0)
+            self.intervalSpinBox.setMaximum(0)
+            self.intervalSpinBox.setValue(0)
+            self.ppmSpinBox.setMinimum(0)
+            self.ppmSpinBox.setMaximum(0)
+            self.ppmSpinBox.setValue(0)
+            self.cropSpinBox.setMinimum(0)
+            self.cropSpinBox.setMaximum(0)
+            self.cropSpinBox.setValue(0)
             self.rtl_power_thread = HackRFSweepThread(self.data_storage)
             print(self.rtl_power_thread)
         else:
+            self.gainSpinBox.setMinimum(-1)
+            self.gainSpinBox.setMaximum(49)
+            self.gainSpinBox.setValue(-1)
+            self.startFreqSpinBox.setMinimum(24)
+            self.startFreqSpinBox.setMaximum(1766)
+            self.startFreqSpinBox.setValue(87)
+            self.stopFreqSpinBox.setMinimum(24)
+            self.stopFreqSpinBox.setMaximum(1766)
+            self.stopFreqSpinBox.setValue(108)
+            self.binSizeSpinBox.setMinimum(0)
+            self.binSizeSpinBox.setMaximum(2800)
+            self.binSizeSpinBox.setValue(10)
+            self.intervalSpinBox.setMinimum(0)
+            self.intervalSpinBox.setMaximum(999)
+            self.intervalSpinBox.setValue(10)
+            self.ppmSpinBox.setMinimum(-999)
+            self.ppmSpinBox.setMaximum(999)
+            self.ppmSpinBox.setValue(0)
+            self.cropSpinBox.setMinimum(0)
+            self.cropSpinBox.setMaximum(99)
+            self.cropSpinBox.setValue(0)
             self.rtl_power_thread = RtlPowerThread(self.data_storage)
 
         self.rtl_power_thread.rtlPowerStarted.connect(self.update_buttons)
@@ -223,9 +294,9 @@ class QSpectrumAnalyzerMainWindow(QtGui.QMainWindow, Ui_QSpectrumAnalyzerMainWin
     def load_settings(self):
         """Restore spectrum analyzer settings and window geometry"""
         settings = QtCore.QSettings()
-        self.startFreqSpinBox.setValue(settings.value("start_freq", 88.0, float))
+        self.startFreqSpinBox.setValue(settings.value("start_freq", 87.0, float))
         self.stopFreqSpinBox.setValue(settings.value("stop_freq", 108.0, float))
-        self.binSizeSpinBox.setValue(settings.value("bin_size", 100.0, float))
+        self.binSizeSpinBox.setValue(settings.value("bin_size", 10.0, float))
         self.intervalSpinBox.setValue(settings.value("interval", 10.0, float))
         self.gainSpinBox.setValue(settings.value("gain", 0, int))
         self.ppmSpinBox.setValue(settings.value("ppm", 0, int))
diff --git a/qspectrumanalyzer/backend.py b/qspectrumanalyzer/backend.py
index 1fa6556..5345629 100644
--- a/qspectrumanalyzer/backend.py
+++ b/qspectrumanalyzer/backend.py
@@ -275,7 +275,7 @@ class RtlPowerFftwThread(RtlPowerBaseThread):
 class HackRFSweepThread(RtlPowerBaseThread):
     """Thread which runs hackrf_sweep process"""
     def setup(self, start_freq=0, stop_freq=6000, bin_size=1000,
-            interval=0.0, gain=0, ppm=0, crop=0, single_shot=False,
+            interval=0.0, gain=40, ppm=0, crop=0, single_shot=False,
             device_index=0, sample_rate=20000000):
         """Setup hackrf_sweep params"""
         # theoretically we can support bins smaller than 40 kHz, but it is
@@ -293,6 +293,14 @@ class HackRFSweepThread(RtlPowerBaseThread):
         total_bandwidth = step_count * step_bandwidth
         stop_freq = start_freq + total_bandwidth
 
+        # distribute gain between two analog gain stages
+        if gain < 0:
+            gain = 0
+        if gain > 102:
+            gain = 102
+        lna_gain = 8 * (gain // 18)
+        vga_gain = 2 * ((gain - lna_gain) // 2)
+
         self.params = {
             "start_freq": start_freq, # MHz
             "stop_freq": stop_freq, # MHz
@@ -301,7 +309,9 @@ class HackRFSweepThread(RtlPowerBaseThread):
             "sample_rate": 20e6, # sps
             "bin_size": bin_size, # kHz
             "interval": 0, # seconds
-            "gain": 0,
+            "gain": gain,
+            "lna_gain": lna_gain,
+            "vga_gain": vga_gain,
             "ppm": 0,
             "crop": 0,
             "single_shot": single_shot
@@ -322,6 +332,8 @@ class HackRFSweepThread(RtlPowerBaseThread):
                                 int(self.params["stop_freq"])),
                         "-B",
                         "-w", "{}".format(int(self.params["bin_size"]*1000)),
+                        "-l", "{}".format(int(self.params["lna_gain"])),
+                        "-g", "{}".format(int(self.params["vga_gain"])),
             ]
 
             if self.params["single_shot"]:
diff --git a/qspectrumanalyzer/qspectrumanalyzer.ui b/qspectrumanalyzer/qspectrumanalyzer.ui
index 2562645..63467ba 100644
--- a/qspectrumanalyzer/qspectrumanalyzer.ui
+++ b/qspectrumanalyzer/qspectrumanalyzer.ui
@@ -189,13 +189,13 @@
         <number>3</number>
        </property>
        <property name="minimum">
-        <double>0.000000000000000</double>
+        <double>24.000000000000000</double>
        </property>
        <property name="maximum">
-        <double>6000.000000000000000</double>
+        <double>1766.000000000000000</double>
        </property>
        <property name="value">
-        <double>88.000000000000000</double>
+        <double>87.000000000000000</double>
        </property>
       </widget>
      </item>
@@ -227,10 +227,10 @@
         <number>3</number>
        </property>
        <property name="minimum">
-        <double>0.000000000000000</double>
+        <double>24.000000000000000</double>
        </property>
        <property name="maximum">
-        <double>6000.000000000000000</double>
+        <double>1766.000000000000000</double>
        </property>
        <property name="value">
         <double>108.000000000000000</double>
@@ -265,10 +265,10 @@
         <number>3</number>
        </property>
        <property name="maximum">
-        <double>5000.000000000000000</double>
+        <double>2800.000000000000000</double>
        </property>
        <property name="value">
-        <double>100.000000000000000</double>
+        <double>10.000000000000000</double>
        </property>
       </widget>
      </item>
diff --git a/qspectrumanalyzer/ui_qspectrumanalyzer.py b/qspectrumanalyzer/ui_qspectrumanalyzer.py
index 115af1d..db0ed27 100644
--- a/qspectrumanalyzer/ui_qspectrumanalyzer.py
+++ b/qspectrumanalyzer/ui_qspectrumanalyzer.py
@@ -116,9 +116,9 @@ class Ui_QSpectrumAnalyzerMainWindow(object):
         self.startFreqSpinBox.setSizePolicy(sizePolicy)
         self.startFreqSpinBox.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter)
         self.startFreqSpinBox.setDecimals(3)
-        self.startFreqSpinBox.setMinimum(0.0)
-        self.startFreqSpinBox.setMaximum(6000.0)
-        self.startFreqSpinBox.setProperty("value", 88.0)
+        self.startFreqSpinBox.setMinimum(24.0)
+        self.startFreqSpinBox.setMaximum(1766.0)
+        self.startFreqSpinBox.setProperty("value", 87.0)
         self.startFreqSpinBox.setObjectName(_fromUtf8("startFreqSpinBox"))
         self.formLayout.setWidget(0, QtGui.QFormLayout.FieldRole, self.startFreqSpinBox)
         self.label_3 = QtGui.QLabel(self.frequencyDockWidgetContents)
@@ -132,8 +132,8 @@ class Ui_QSpectrumAnalyzerMainWindow(object):
         self.stopFreqSpinBox.setSizePolicy(sizePolicy)
         self.stopFreqSpinBox.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter)
         self.stopFreqSpinBox.setDecimals(3)
-        self.stopFreqSpinBox.setMinimum(0.0)
-        self.stopFreqSpinBox.setMaximum(6000.0)
+        self.stopFreqSpinBox.setMinimum(24.0)
+        self.stopFreqSpinBox.setMaximum(1766.0)
         self.stopFreqSpinBox.setProperty("value", 108.0)
         self.stopFreqSpinBox.setObjectName(_fromUtf8("stopFreqSpinBox"))
         self.formLayout.setWidget(1, QtGui.QFormLayout.FieldRole, self.stopFreqSpinBox)
@@ -148,8 +148,8 @@ class Ui_QSpectrumAnalyzerMainWindow(object):
         self.binSizeSpinBox.setSizePolicy(sizePolicy)
         self.binSizeSpinBox.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter)
         self.binSizeSpinBox.setDecimals(3)
-        self.binSizeSpinBox.setMaximum(5000.0)
-        self.binSizeSpinBox.setProperty("value", 100.0)
+        self.binSizeSpinBox.setMaximum(2800.0)
+        self.binSizeSpinBox.setProperty("value", 10.0)
         self.binSizeSpinBox.setObjectName(_fromUtf8("binSizeSpinBox"))
         self.formLayout.setWidget(2, QtGui.QFormLayout.FieldRole, self.binSizeSpinBox)
         spacerItem1 = QtGui.QSpacerItem(20, 0, QtGui.QSizePolicy.Minimum, QtGui.QSizePolicy.Expanding)