diff --git a/nanovna.h b/nanovna.h
index 102d364..439ac6f 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -591,7 +591,7 @@ typedef struct setting
   int harmonic;
   int decay;
   int noise;
-  float vbw;
+  uint32_t vbw_x10;
   int  tracking_output;
   int repeat;
   uint32_t frequency0;
diff --git a/sa_core.c b/sa_core.c
index e281fef..85f7085 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -78,7 +78,7 @@ void reset_settings(int m)
   setting.step_delay = 0;
   setting.offset_delay = 0;
   setting.step_delay_mode = SD_NORMAL;
-  setting.vbw = 0;
+  setting.vbw_x10 = 0;
   setting.auto_reflevel = true;     // Must be after SetReflevel
   setting.decay=20;
   setting.noise=5;
@@ -1062,13 +1062,13 @@ case M_GENHIGH: // Direct output from 1
 void update_rbw(void)           // calculate the actual_rbw and the vbwSteps (# steps in between needed if frequency step is largen than maximum rbw)
 {
   if (setting.frequency_step > 0 && MODE_INPUT(setting.mode)) {
-    setting.vbw = (setting.frequency_step)/1000.0;
+    setting.vbw_x10 = (setting.frequency_step)/100;
   } else {
-    setting.vbw = 300; // trick to get right default rbw in zero span mode
+    setting.vbw_x10 = 3000; // trick to get right default rbw in zero span mode
   }
   actual_rbw_x10 = setting.rbw_x10;     // requested rbw
   if (actual_rbw_x10 == 0) {        // if auto rbw
-    actual_rbw_x10 = 20.0*setting.vbw; // rbw is twice the frequency step to ensure no gaps in coverage
+    actual_rbw_x10 = 2*setting.vbw_x10; // rbw is twice the frequency step to ensure no gaps in coverage
   }
   if (actual_rbw_x10 < 26)
     actual_rbw_x10 = 26;
@@ -1082,13 +1082,13 @@ void update_rbw(void)           // calculate the actual_rbw and the vbwSteps (#
   actual_rbw_x10 = SI4432_SET_RBW(actual_rbw_x10);  // see what rbw the SI4432 can realize
 
   if (setting.frequency_step > 0 && MODE_INPUT(setting.mode)) { // When doing frequency scanning in input mode
-    vbwSteps = ((int)(2 * (setting.vbw + (actual_rbw/2)) / actual_rbw)); // calculate # steps in between each frequency step due to rbw being less than frequency step
+    vbwSteps = ((int)(2 * (setting.vbw_x10 + (actual_rbw_x10/2)) / actual_rbw_x10)); // calculate # steps in between each frequency step due to rbw being less than frequency step
     if (setting.step_delay==1)                  // if in Precise scanning
       vbwSteps *= 2;                            // use twice as many steps
     if (vbwSteps < 1)                            // at least one step
       vbwSteps = 1;
   } else {                      // in all other modes
-    setting.vbw = actual_rbw_x10/10.0;
+    setting.vbw_x10 = actual_rbw_x10;
     vbwSteps = 1;               // only one vbwSteps
   }
   dirty = true;
@@ -2294,7 +2294,7 @@ void draw_cal_status(void)
     ili9341_drawstring("VBW:", x, y);
 
     y += YSTEP;
-    plot_printf(buf, BLEN, "%dkHz",(int)setting.vbw);
+    plot_printf(buf, BLEN, "%dkHz",(int)setting.vbw_x10/10.0);
     buf[6]=0;
     ili9341_drawstring(buf, x, y);
   }
@@ -2909,7 +2909,7 @@ do_again:
       setting.step_delay_mode = SD_NORMAL;
       setting.step_delay = setting.step_delay * 5 / 4;
       setting.rbw_x10 = SI4432_force_RBW(j);
-      shell_printf("RBW = %d, ",setting.rbw/10);
+      shell_printf("RBW = %d, ",setting.rbw_x10/10);
       set_sweep_frequency(ST_SPAN, (uint32_t)(setting.rbw_x10 * 20000));
 
       setting.repeat = 10;
@@ -2948,14 +2948,14 @@ do_again:
 #endif
       setting.offset_delay = 1600;
       test_value = saved_peakLevel;
-      if ((uint32_t)(setting.rbw * 10000) / 290 < 8000) {           // fast mode possible
+      if ((uint32_t)(setting.rbw_x10 * 1000) / 290 < 8000) {           // fast mode possible
         while (setting.offset_delay > 0 && test_value != 0 && test_value > saved_peakLevel - 1.5) {
           test_prepare(i);
           setting.step_delay_mode = SD_FAST;
           setting.offset_delay /= 2;
           setting.spur = 0;
           //      shell_printf("\n\rRBW = %f",SI4432_force_RBW(j));
-          set_sweep_frequency(ST_SPAN, (uint32_t)(setting.rbw * 200000));   // 200 times RBW
+          set_sweep_frequency(ST_SPAN, (uint32_t)(setting.rbw_x10 * 20000));   // 200 times RBW
           setting.repeat = 10;
           test_acquire(i);                        // Acquire test
           test_validate(i);                       // Validate test