diff --git a/sa_core.c b/sa_core.c
index 6df6c94..f047e9a 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -3642,20 +3642,21 @@ static bool sweep(bool break_on_operation)
 
 #ifdef __VBW__
   // ------------------------ do VBW processing ------------------------------
-
-    int vbw_count_div2 = actual_rbw_x10 * 100 / setting.frequency_step / (setting.vbw_x10 == 0 ? 10 : setting.vbw_x10);
-    while(vbw_count_div2-- > 0){
-      pureRSSI_t prev = temp_t[0];
-      int j;
-      // first point smooth
-      temp_t[0] = (prev + prev + temp_t[1])/3.0f;
-      for (j=1;j<sweep_points-1;j++){
-        pureRSSI_t old = temp_t[j]; // save current data point for next point smooth
-        temp_t[j] = (prev + temp_t[j] + temp_t[j] + temp_t[j+1])/4;
-        prev = old;
+    if (setting.frequency_step) {
+      int vbw_count_div2 = actual_rbw_x10 * 100 / setting.frequency_step / (setting.vbw_x10 == 0 ? 10 : setting.vbw_x10);
+      while(vbw_count_div2-- > 0){
+        pureRSSI_t prev = temp_t[0];
+        int j;
+        // first point smooth
+        temp_t[0] = (prev + prev + temp_t[1])/3.0f;
+        for (j=1;j<sweep_points-1;j++){
+          pureRSSI_t old = temp_t[j]; // save current data point for next point smooth
+          temp_t[j] = (prev + temp_t[j] + temp_t[j] + temp_t[j+1])/4;
+          prev = old;
+        }
+        // last point smooth
+        temp_t[j] = (temp_t[j] + temp_t[j] + prev)/3;
       }
-      // last point smooth
-      temp_t[j] = (temp_t[j] + temp_t[j] + prev)/3;
     }
 #endif
 
diff --git a/si4468.c b/si4468.c
index 44d8a57..65a5c19 100644
--- a/si4468.c
+++ b/si4468.c
@@ -1919,6 +1919,7 @@ void si_fm_offset(int16_t offset)
 extern deviceRSSI_t age[POINTS_COUNT];
 static int buf_index = 0;
 static bool  buf_read = false;
+uint32_t old_t = 0;
 
 void SI446x_Fill(int s, int start)
 {
@@ -1930,6 +1931,10 @@ void SI446x_Fill(int s, int start)
 #endif
 
   uint32_t t = setting.additional_step_delay_us;
+  if (t < old_t +100 && t + 100 > old_t) {
+    t = (t + old_t) >> 1;
+  }
+  old_t = t;
   __disable_irq();
   systime_t measure = chVTGetSystemTimeX();
 
diff --git a/ui_sa.c b/ui_sa.c
index ce06ca4..123aa86 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -3024,17 +3024,21 @@ redraw_cal_status:
   plot_printf(buf, BLEN, "%.1FHz", actual_rbw_x10*100.0);
   y = add_quick_menu(buf, x, y,(menuitem_t *)menu_rbw);
 
-#if 0
+#ifdef __VBW__
   // VBW
   if (setting.frequency_step > 0) {
-    ili9341_set_foreground(LCD_FG_COLOR);
-    y += YSTEP + YSTEP/2 ;
+    int vbw = setting.vbw_x10;
+    if (vbw != 0)
+      color = LCD_BRIGHT_COLOR_GREEN;
+    else {
+      color = LCD_FG_COLOR;
+      vbw = 10;
+    }
+    ili9341_set_foreground(color);
     ili9341_drawstring("VBW:", x, y);
-
     y += YSTEP;
-    plot_printf(buf, BLEN, "%dkHz",(int)setting.vbw_x10/10.0);
-    buf[6]=0;
-    ili9341_drawstring(buf, x, y);
+    plot_printf(buf, BLEN, "%.1FHz", actual_rbw_x10*100.0 *vbw/10.0);
+    y = add_quick_menu(buf, x, y,(menuitem_t *)menu_vbw);
   }
 #endif
   // Sweep time