Option to select "Low sidelobes" or "Most sensitive" for waterfall spectra.

Configuration.cpp

@@ -630,6 +630,7 @@ private:
   bool udpWindowToFront_;
   bool udpWindowRestore_;
   DataMode data_mode_;
+  bool bLowSidelobes_;
   bool pwrBandTxMemory_;
   bool pwrBandTuneMemory_;
 
@@ -720,6 +721,7 @@ bool Configuration::accept_udp_requests () const {return m_->accept_udp_requests
 QString Configuration::n1mm_server_name () const {return m_->n1mm_server_name_;}
 auto Configuration::n1mm_server_port () const -> port_type {return m_->n1mm_server_port_;}
 bool Configuration::broadcast_to_n1mm () const {return m_->broadcast_to_n1mm_;}
+bool Configuration::lowSidelobes() const {return m_->bLowSidelobes_;}
 bool Configuration::udpWindowToFront () const {return m_->udpWindowToFront_;}
 bool Configuration::udpWindowRestore () const {return m_->udpWindowRestore_;}
 Bands * Configuration::bands () {return &m_->bands_;}
@@ -1285,6 +1287,8 @@ void Configuration::impl::initialize_models ()
   ui_->udpWindowRestore->setChecked(udpWindowRestore_);
   ui_->calibration_intercept_spin_box->setValue (calibration_.intercept);
   ui_->calibration_slope_ppm_spin_box->setValue (calibration_.slope_ppm);
+  ui_->rbLowSidelobes->setChecked(bLowSidelobes_);
+  if(!bLowSidelobes_) ui_->rbMaxSensitivity->setChecked(true);
 
   if (rig_params_.ptt_port.isEmpty ())
     {
@@ -1476,6 +1480,7 @@ void Configuration::impl::read_settings ()
   rig_params_.audio_source = settings_->value ("TXAudioSource", QVariant::fromValue (TransceiverFactory::TX_audio_source_front)).value<TransceiverFactory::TXAudioSource> ();
   rig_params_.ptt_port = settings_->value ("PTTport").toString ();
   data_mode_ = settings_->value ("DataMode", QVariant::fromValue (data_mode_none)).value<Configuration::DataMode> ();
+  bLowSidelobes_ = settings_->value("LowSidelobes",true).toBool();
   prompt_to_log_ = settings_->value ("PromptToLog", false).toBool ();
   autoLog_ = settings_->value ("AutoLog", false).toBool ();
   decodes_from_top_ = settings_->value ("DecodesFromTop", false).toBool ();
@@ -1577,6 +1582,7 @@ void Configuration::impl::write_settings ()
   settings_->setValue ("CATStopBits", QVariant::fromValue (rig_params_.stop_bits));
   settings_->setValue ("CATHandshake", QVariant::fromValue (rig_params_.handshake));
   settings_->setValue ("DataMode", QVariant::fromValue (data_mode_));
+  settings_->setValue ("LowSidelobes",bLowSidelobes_);
   settings_->setValue ("PromptToLog", prompt_to_log_);
   settings_->setValue ("AutoLog", autoLog_);
   settings_->setValue ("DecodesFromTop", decodes_from_top_);
@@ -2035,6 +2041,7 @@ void Configuration::impl::accept ()
   watchdog_ = ui_->tx_watchdog_spin_box->value ();
   TX_messages_ = ui_->TX_messages_check_box->isChecked ();
   data_mode_ = static_cast<DataMode> (ui_->TX_mode_button_group->checkedId ());
+  bLowSidelobes_ = ui_->rbLowSidelobes->isChecked();
   save_directory_ = ui_->save_path_display_label->text ();
   azel_directory_ = ui_->azel_path_display_label->text ();
   enable_VHF_features_ = ui_->enable_VHF_features_check_box->isChecked ();

Configuration.hpp

@@ -137,6 +137,7 @@ public:
   bool twoPass() const;
   bool bFox() const;
   bool bHound() const;
+  bool bLowSidelobes() const;
   bool x2ToneSpacing() const;
   bool x4ToneSpacing() const;
   bool MyDx() const;
@@ -152,6 +153,7 @@ public:
   port_type n1mm_server_port () const;
   bool valid_n1mm_info () const;
   bool broadcast_to_n1mm() const;
+  bool lowSidelobes() const;
   bool accept_udp_requests () const;
   bool udpWindowToFront () const;
   bool udpWindowRestore () const;

Configuration.ui

@@ -17,7 +17,7 @@
    <item>
     <widget class="QTabWidget" name="configuration_tabs">
      <property name="currentIndex">
-      <number>0</number>
+      <number>7</number>
      </property>
      <widget class="QWidget" name="general_tab">
       <attribute name="title">
@@ -2821,6 +2821,48 @@ Right click for insert and delete options.</string>
             </layout>
            </widget>
           </item>
+          <item row="4" column="0" colspan="2">
+           <widget class="QGroupBox" name="groupBox_7">
+            <property name="minimumSize">
+             <size>
+              <width>0</width>
+              <height>50</height>
+             </size>
+            </property>
+            <property name="title">
+             <string>Waterfall spectra</string>
+            </property>
+            <widget class="QRadioButton" name="rbLowSidelobes">
+             <property name="geometry">
+              <rect>
+               <x>10</x>
+               <y>20</y>
+               <width>91</width>
+               <height>17</height>
+              </rect>
+             </property>
+             <property name="text">
+              <string>Low sidelobes</string>
+             </property>
+             <property name="checked">
+              <bool>true</bool>
+             </property>
+            </widget>
+            <widget class="QRadioButton" name="rbMaxSensitivity">
+             <property name="geometry">
+              <rect>
+               <x>120</x>
+               <y>20</y>
+               <width>92</width>
+               <height>17</height>
+              </rect>
+             </property>
+             <property name="text">
+              <string>Most sensitive</string>
+             </property>
+            </widget>
+           </widget>
+          </item>
          </layout>
         </widget>
        </item>
@@ -3036,13 +3078,13 @@ Right click for insert and delete options.</string>
   </connection>
  </connections>
  <buttongroups>
-  <buttongroup name="CAT_data_bits_button_group"/>
-  <buttongroup name="special_op_activity_button_group"/>
-  <buttongroup name="PTT_method_button_group"/>
-  <buttongroup name="TX_audio_source_button_group"/>
-  <buttongroup name="TX_mode_button_group"/>
-  <buttongroup name="split_mode_button_group"/>
   <buttongroup name="CAT_stop_bits_button_group"/>
+  <buttongroup name="special_op_activity_button_group"/>
+  <buttongroup name="TX_mode_button_group"/>
+  <buttongroup name="CAT_data_bits_button_group"/>
+  <buttongroup name="TX_audio_source_button_group"/>
   <buttongroup name="CAT_handshake_button_group"/>
+  <buttongroup name="PTT_method_button_group"/>
+  <buttongroup name="split_mode_button_group"/>
  </buttongroups>
 </ui>

lib/symspec.f90

@@ -1,10 +1,11 @@
-subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,nminw,pxdb,s,   &
+subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,bLowSidelobes,    &
-     df3,ihsym,npts8,pxdbmax)
+     nminw,pxdb,s,df3,ihsym,npts8,pxdbmax)
 
 ! Input:
 !  k              pointer to the most recent new data
 !  ntrperiod      T/R sequence length, minutes
 !  nsps           samples per symbol, at 12000 Hz
+!  bLowSidelobes  true to use windowed FFTs
 !  ndiskdat       0/1 to indicate if data from disk
 !  nb             0/1 status of noise blanker (off/on)
 !  nbslider       NB setting, 0-100
@@ -29,6 +30,7 @@ subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,nminw,pxdb,s,   &
   real*4 tmp(NSMAX)
   complex cx(0:MAXFFT3/2)
   integer nch(7)
+  logical*1 bLowSidelobes
 
   common/spectra/syellow(NSMAX),ref(0:3456),filter(0:3456)
   data k0/99999999/,nfft3z/0/
@@ -48,15 +50,9 @@ subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,nminw,pxdb,s,   &
   if(nfft3.ne.nfft3z) then
 ! Compute new window
      pi=4.0*atan(1.0)
-!     width=0.25*nsps
-!     do i=1,nfft3
-!        z=(i-nfft3/2)/width
-!        w3(i)=exp(-z*z)
-!     enddo
 ! Coefficients taken from equation 37 of NUSC report:
 ! "Some windows with very good sidelobe behavior: application to 
 ! discrete Hilbert Transform, by Albert Nuttall"
-!
      a0=0.3635819
      a1=-0.4891775;
      a2=0.1365995;
@@ -99,10 +95,10 @@ subroutine symspec(shared_data,k,ntrperiod,nsps,ingain,nminw,pxdb,s,   &
   enddo
   ihsym=ihsym+1
 
-  xc(0:nfft3-1)=w3(1:nfft3)*xc(0:nfft3-1)    !Apply window w3
+  if(bLowSidelobes) xc(0:nfft3-1)=w3(1:nfft3)*xc(0:nfft3-1)    !Apply window 
   call four2a(xc,nfft3,1,-1,0)        !Real-to-complex FFT
 
-  df3=12000.0/nfft3                   !JT9-1: 0.732 Hz = 0.42 * tone spacing
+  df3=12000.0/nfft3                   !JT9: 0.732 Hz = 0.42 * tone spacing
   iz=min(NSMAX,nint(5000.0/df3))
   fac=(1.0/nfft3)**2
   do i=1,iz

widgets/mainwindow.cpp

@@ -86,8 +86,8 @@
 extern "C" {
   //----------------------------------------------------- C and Fortran routines
   void symspec_(struct dec_data *, int* k, int* ntrperiod, int* nsps, int* ingain,
-                int* minw, float* px, float s[], float* df3, int* nhsym, int* npts8,
+                bool* bLowSidelobes, int* minw, float* px, float s[], float* df3,
-                float *m_pxmax);
+                int* nhsym, int* npts8, float *m_pxmax);
 
   void hspec_(short int d2[], int* k, int* nutc0, int* ntrperiod, int* nrxfreq, int* ntol,
               int* nContest, bool* bmsk144, bool* btrain, double const pcoeffs[], int* ingain,
@@ -1364,7 +1364,9 @@ void MainWindow::dataSink(qint64 frames)
   int nsps=m_nsps;
   if(m_bFastMode) nsps=6912;
   int nsmo=m_wideGraph->smoothYellow()-1;
-  symspec_(&dec_data,&k,&trmin,&nsps,&m_inGain,&nsmo,&m_px,s,&m_df3,&m_ihsym,&m_npts8,&m_pxmax);
+  bool bLowSidelobes=m_config.lowSidelobes();
+  symspec_(&dec_data,&k,&trmin,&nsps,&m_inGain,&bLowSidelobes,&nsmo,&m_px,s,
+           &m_df3,&m_ihsym,&m_npts8,&m_pxmax);
   if(m_mode=="WSPR") wspr_downsample_(dec_data.d2,&k);
   if(m_ihsym <=0) return;
   if(ui) ui->signal_meter_widget->setValue(m_px,m_pxmax); // Update thermometer