diff --git a/sa_core.c b/sa_core.c
index 83306d2..115fd3f 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -3329,7 +3329,7 @@ static int fm_modulation[MAX_MODULATION_STEPS+1];
 //
 //  Offset is 156.25Hz when below 600MHz and 312.5 when above.
 //
-#define LND  12   // Total NFM deviation is LND * 4 * 156.25 = 5kHz when below 600MHz or 600MHz - 434MHz
+#define LND  10   // Total NFM deviation is LND * 4 * 156.25 = 5kHz when below 600MHz or 600MHz - 434MHz
 #define HND  6
 #define LWD  240 // Total WFM deviation is LWD * 4 * 156.25 = 75kHz when below 600MHz
 #define HWD  120
@@ -4591,7 +4591,7 @@ again:                                                              // Spur redu
         pureRSSI = DEVICE_TO_PURE_RSSI((deviceRSSI_t)SI4432_Read_Byte(SI4432_REG_RSSI));
 #endif
 #ifdef __SI4463__
-        pureRSSI = Si446x_RSSI();
+        pureRSSI = Si446x_RSSI(break_on_operation);
         if (LO_shifting)
           pureRSSI += float_TO_PURE_RSSI(actual_rbw_x10>USE_SHIFT2_RBW ? config.shift2_level_offset : (lf < LOW_SHIFT_FREQ ? config.shift1_level_offset: 0.0));
 
@@ -4684,13 +4684,13 @@ again:                                                              // Spur redu
     //else
     {
 #ifdef __SI4432__
-      pureRSSI = SI4432_RSSI(lf, MODE_SELECT(setting.mode));            // Get RSSI, either from pre-filled buffer
+      pureRSSI = SI4432_RSSI(lf, MODE_SELECT(setting.mode), break_on_operation);            // Get RSSI, either from pre-filled buffer
 #endif
 #ifdef __SI4463__
       if (real_old_freq[SI4463_RX] == 0)
         pureRSSI = 0;
       else {
-        pureRSSI = Si446x_RSSI();
+        pureRSSI = Si446x_RSSI(break_on_operation);
         if (LO_shifting)
           pureRSSI += float_TO_PURE_RSSI(actual_rbw_x10>USE_SHIFT2_RBW ? config.shift2_level_offset : (lf < LOW_SHIFT_FREQ ? config.shift1_level_offset: 0.0));
       }
diff --git a/si4432.c b/si4432.c
index c920c7d..f7b8215 100644
--- a/si4432.c
+++ b/si4432.c
@@ -784,7 +784,7 @@ pureRSSI_t getSI4432_RSSI_correction(void){
   return SI4432_RSSI_correction;
 };
 
-pureRSSI_t SI4432_RSSI(uint32_t i, int s)
+pureRSSI_t SI4432_RSSI(uint32_t i, int s, bool break_on_operation)
 {
   (void) i;
   int32_t RSSI_RAW;
@@ -826,6 +826,8 @@ pureRSSI_t SI4432_RSSI(uint32_t i, int s)
     RSSI_RAW += DEVICE_TO_PURE_RSSI((deviceRSSI_t)SI4432_Read_Byte(SI4432_REG_RSSI));
     if (--i == 0) break;
     my_microsecond_delay(100);
+    if (break_on_operation && operation_requested)
+      break;
   }while(1);
 
   if (setting.repeat > 1){
diff --git a/si4432.h b/si4432.h
index 459cbb9..bcf4f4c 100644
--- a/si4432.h
+++ b/si4432.h
@@ -129,7 +129,7 @@ void SI4432_Reset(void);
 void SI4432_Init(void);
 void SI4432_Drive(int);
 pureRSSI_t getSI4432_RSSI_correction(void);
-pureRSSI_t SI4432_RSSI(uint32_t i, int s);
+pureRSSI_t SI4432_RSSI(uint32_t i, int s, bool break_on_operation);
 #ifdef __SIMULATION__
 float Simulated_SI4432_RSSI(uint32_t i, int s);
 #endif
@@ -184,7 +184,7 @@ extern int si5351_available;
 #ifdef __SI4463__
 #include "si446x_defs.h"
 #include "si446x.h"
-int16_t Si446x_RSSI(void);
+int16_t Si446x_RSSI(bool break_on_operation);
 uint8_t getFRR(uint8_t reg);
 si446x_state_t getState(void);
 void setState(si446x_state_t newState);
diff --git a/si4468.c b/si4468.c
index db7b98f..9ef22d1 100644
--- a/si4468.c
+++ b/si4468.c
@@ -1633,7 +1633,7 @@ void SI4432_Listen(int s)
 #endif
 
 
-int16_t Si446x_RSSI(void)
+int16_t Si446x_RSSI(bool break_on_operation)
 {
 #ifdef __FAST_SWEEP__
   if (buf_read) {
@@ -1696,6 +1696,8 @@ int16_t Si446x_RSSI(void)
     if (--i <= 0) break;
     if (setting.repeat > 1)
       my_microsecond_delay(SI4432_step_delay);
+    if (break_on_operation && operation_requested)
+      break;
   }while(1);
 
   if (setting.repeat > 1 && setting.exp_aver == 1)
diff --git a/ui.c b/ui.c
index ad76e6e..14815b5 100644
--- a/ui.c
+++ b/ui.c
@@ -2076,7 +2076,7 @@ const char *menu_modulation_text[MO_MAX]=
    "FM 3kHz",
    "FM 5kHz",
 #else
-   "FM 4kHz",
+   "FM 3kHz",
 #endif
    "FM 75kHz", "External"};