Fast below IF added and increase RBW if fast scanning

sa_core.c

@@ -996,6 +996,17 @@ void set_freq(int V, unsigned long freq)    // translate the requested frequency
       } else {
 #ifdef __WIDE_OFFSET__
         uint32_t target_f;                    // Impossible to use offset so set SI4432 to new frequency
+        if (freq < real_old_freq[V]) {                          // sweeping down
+          if (freq - 80000 >= 480000000) {
+            target_f = freq - 160000;
+          } else {
+            target_f = freq - 80000;
+          }
+          SI4432_Set_Frequency(target_f);
+          SI4432_Write_Byte(SI4432_FREQ_OFFSET1, 0xff);           // set offset to most positive
+          SI4432_Write_Byte(SI4432_FREQ_OFFSET2, 0x01);
+          real_old_freq[V] = target_f;
+        } else {                                                // sweeping up
           if (freq + 80000 >= 480000000) {
             target_f = freq + 160000;
           } else {
@@ -1005,6 +1016,7 @@ void set_freq(int V, unsigned long freq)    // translate the requested frequency
           SI4432_Write_Byte(SI4432_FREQ_OFFSET1, 0);           // set offset to most negative
           SI4432_Write_Byte(SI4432_FREQ_OFFSET2, 0x02);
           real_old_freq[V] = target_f;
+        }
 #else
         SI4432_Set_Frequency(freq);           // Impossible to use offset so set SI4432 to new frequency
         SI4432_Write_Byte(SI4432_FREQ_OFFSET1, 0);           // set offset to zero
@@ -1147,6 +1159,12 @@ void update_rbw(void)           // calculate the actual_rbw and the vbwSteps (#
   }
   actual_rbw_x10 = setting.rbw_x10;     // requested rbw
   if (actual_rbw_x10 == 0) {        // if auto rbw
+    if (setting.step_delay_mode==SD_FAST) {    // if in fast scanning
+      if (fast_speedup > 2)
+        actual_rbw_x10 = 6*setting.vbw_x10; // rbw is four the frequency step to ensure no gaps in coverage as there are some weird jumps
+      else
+        actual_rbw_x10 = 4*setting.vbw_x10; // rbw is four the frequency step to ensure no gaps in coverage as there are some weird jumps
+    } else
       actual_rbw_x10 = 2*setting.vbw_x10; // rbw is twice the frequency step to ensure no gaps in coverage
   }
   if (actual_rbw_x10 < 26)

ui_sa.c

@@ -1292,7 +1292,7 @@ static const menuitem_t menu_atten[] = {
   { MT_CALLBACK | MT_LOW, 0,               "AUTO",    menu_atten_cb},
   { MT_KEYPAD | MT_LOW,   KM_ATTENUATION,  "MANUAL",  "0..30"},
   { MT_CALLBACK | MT_HIGH,0,               "0dB",     menu_atten_high_cb},
-  { MT_CALLBACK | MT_HIGH,30,              "\00225..30dB",    menu_atten_high_cb},
+  { MT_CALLBACK | MT_HIGH,30,              "\00225..40dB",    menu_atten_high_cb},
   { MT_CANCEL, 0,               "\032 BACK", NULL },
   { MT_FORM | MT_NONE,   0, NULL, NULL } // sentinel
 };