diff --git a/jtms3.pro b/jtms3.pro
index e5712718e..93c322e60 100644
--- a/jtms3.pro
+++ b/jtms3.pro
@@ -6,7 +6,7 @@
 
 QT       += core gui network
 CONFIG   += qwt thread
-#CONFIG   += console
+CONFIG   += console
 
 TARGET = jtms3
 VERSION = 0.1
diff --git a/libm65/specjtms.f90 b/libm65/specjtms.f90
index d76e5eb9a..6b7965c12 100644
--- a/libm65/specjtms.f90
+++ b/libm65/specjtms.f90
@@ -20,6 +20,8 @@ subroutine specjtms(k,px,pxsmo,spk0,f0)
      sqsmo=0.
   endif
 
+  if(k.lt.kstep .or. k.gt.NSMAX) return
+
   t=k/48000.0
   nfft=4096
   df=48000.0/nfft
@@ -38,10 +40,12 @@ subroutine specjtms(k,px,pxsmo,spk0,f0)
   px=db(sq) - 23.0
   pxsmo=db(sqsmo) - 23.0
 
-  do i=i0,ia-1
-     d=id(i)
-     sq=sq + d*d
-  enddo
+  if(i0.gt.0) then
+     do i=i0,ia-1
+        d=id(i)
+        sq=sq + d*d
+     enddo
+  endif
   sq0=sq
 !  write(13,1010) t,rms,sq,px,pxsmo
 !1010 format(5f12.3)
@@ -71,7 +75,8 @@ subroutine specjtms(k,px,pxsmo,spk0,f0)
   
   call four2a(cx2,nfft,1,-1,1)                   !Forward c2c FFT of cx2
 
-  j0=nint(2.0*1428.57/df)
+!  j0=nint(2.0*1428.57/df)
+  j0=nint(2.0*1500.0/df)
   ja=j0-107
   jb=j0+107
   do j=ja,jb
diff --git a/mainwindow.cpp b/mainwindow.cpp
index cdaf00d10..fdb6acede 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//--------------------------------------------------------------- MainWindow
+//---------------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "devsetup.h"
diff --git a/plotter.cpp b/plotter.cpp
index eac3074df..c206a0bbe 100644
--- a/plotter.cpp
+++ b/plotter.cpp
@@ -112,17 +112,18 @@ void CPlotter::draw(float green[], int ig)                       //draw()
   int i,j,w,h;
   float y;
   int y1;
+  static int ig0=99999;
 
   w = m_WaterfallPixmap.width();
   h = m_WaterfallPixmap.height();
+  if(ig<ig0) {
+    m_WaterfallPixmap.fill(Qt::black);
+    m_ZoomWaterfallPixmap.fill(Qt::black);
+    m_2DPixmap.fill(Qt::black);
+  }
+  ig0=ig;
+
   double gain = pow(10.0,0.05*(m_plotGain+7));
-
-//move current data down one line
-//(must do this before attaching a QPainter object)
-//  m_WaterfallPixmap.scroll(0,1,0,0,w,h);
-//  m_ZoomWaterfallPixmap.scroll(0,1,0,0, w, h);
-//  memmove(&m_zwf[32768],m_zwf,32768*(h-1));
-
   QPainter painter1(&m_WaterfallPixmap);
   QPainter painter2D(&m_2DPixmap);
   painter2D.setPen(Qt::green);