diff --git a/libm65/decode1a.f b/libm65/decode1a.f
index f9abd66d1..aaaafbcac 100644
--- a/libm65/decode1a.f
+++ b/libm65/decode1a.f
@@ -133,12 +133,13 @@
       call timer('dec65b  ',1)
 
       if(nqd.eq.1 .and. nkv.eq.0) then
-         if(nutc.ne.nutc0) syncbest=0.
+         if(nutc.ne.nutc0 .or. nkhz.ne.nkhz0) syncbest=0.
          if(sync2.gt.syncbest) then
-            if(nutc.eq.nutc0) nsave=nsave-1
+            if(nutc.eq.nutc0 .and. nkhz.eq.nkhz0) nsave=nsave-1
             if(nkhz.ne.nkhz0) nsave=0
             nkhz0=nkhz
             nsave=min(32,nsave+1)
+            nsave=max(1,nsave)
             npol=nint(57.296*pol)
             call s3avg(nsave,mode65,nutc,ndf,dt+0.8,npol,s3,nsum,
      +                 nkv,decoded)
diff --git a/libm65/s3avg.f90 b/libm65/s3avg.f90
index 87e1cfa37..a3cceb8fd 100644
--- a/libm65/s3avg.f90
+++ b/libm65/s3avg.f90
@@ -18,6 +18,10 @@ subroutine s3avg(nsave,mode65,nutc,ndf,xdt,npol,s3,nsum,nkv,decoded)
   dt(nsave)=xdt                             !Save DT
   s3a(1:64,1:63,nsave)=s3                   !Save the spectra
 
+  write(71,3001) nsave,nutc,ndf,npol,xdt
+3001 format(4i5,f8.1)
+  flush(71)
+
   s3b=0.
   nsum=0
   idfdiff=100
diff --git a/mainwindow.cpp b/mainwindow.cpp
index b7a451fce..e8c9ac4d2 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1337,6 +1337,7 @@ void MainWindow::guiUpdate()
   static int nc1=1;
   static char msgsent[23];
   static int nsendingsh=0;
+  static int fQSOz=-1;
   int khsym=0;
 
   double tx1=0.0;
@@ -1503,6 +1504,11 @@ void MainWindow::guiUpdate()
 
     QDateTime t = QDateTime::currentDateTimeUtc();
     int fQSO=g_pWideGraph->QSOfreq();
+    if(fQSO != fQSOz) {
+      qDebug() << fQSOz << fQSO << m_nutc0;
+      m_nsave=0;
+      fQSOz=fQSO;
+    }
     g_pAstro->astroUpdate(t, m_myGrid, m_hisGrid, fQSO, m_setftx,
                           m_txFreq, m_azelDir);
     m_setftx=0;