diff --git a/nanovna.h b/nanovna.h
index 858ed16..832587c 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -244,6 +244,7 @@ void set_marker_frequency(int m, freq_t f);
 void set_marker_time(int m, float f);
 void toggle_sweep(void);
 void toggle_mute(void);
+void toggle_pulse(void);
 void load_default_properties(void);
 
 enum {
@@ -977,6 +978,7 @@ typedef struct setting
   bool mute;                   // bool
   bool auto_IF;                // bool
   bool sweep;                  // bool
+  bool pulse;                  // bool
 
   uint8_t mode;                // enum
   uint8_t below_IF;            // enum
diff --git a/sa_core.c b/sa_core.c
index 949bcd2..b831d79 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -513,6 +513,12 @@ void toggle_tracking_output(void)
   dirty = true;
 }
 
+void toggle_pulse(void)
+{
+  setting.pulse = !setting.pulse;
+  dirty = true;
+}
+
 void toggle_debug_avoid(void)
 {
   debug_avoid = !debug_avoid;
@@ -2589,18 +2595,28 @@ pureRSSI_t perform(bool break_on_operation, int i, freq_t f, int tracking)     /
 
   // ---------------------------------  Pulse at start of low output sweep --------------------------
 
-  #ifdef __SI4432__
-  if (setting.mode == M_GENLOW && ( setting.frequency_step != 0 || setting.level_sweep != 0.0)) {// pulse high out
-    SI4432_Sel = SI4432_LO ;
+  if ((setting.mode == M_GENLOW || (setting.pulse && setting.mode == M_LOW)) && ( setting.frequency_step != 0 || setting.level_sweep != 0.0)) {// pulse high out
+#ifdef __SI4432__
+      SI4432_Sel = SI4432_LO ;
+#endif
     if (i == 0) {
 //      set_switch_transmit();
-      SI4432_Write_Byte(SI4432_GPIO2_CONF, 0x1D) ; // Set GPIO2 output to ground
+#ifdef __SI4432__
+      SI4432_Write_Byte(SI4432_GPIO2_CONF, 0x1D) ; // Set GPIO2 output to high
+#endif
+#ifdef __SI4463__
+      SI4463_set_gpio(0, SI446X_GPIO_MODE_DRIVE1);
+#endif
     } else if (i == 1) {
 //      set_switch_off();
+#ifdef __SI4432__
       SI4432_Write_Byte(SI4432_GPIO2_CONF, 0x1F) ; // Set GPIO2 output to ground
+#endif
+#ifdef __SI4463__
+      SI4463_set_gpio(0, SI446X_GPIO_MODE_DRIVE0);
+#endif
     }
   }
-#endif
 #ifdef TINYSA4
   // ----------------------------- set mixer drive --------------------------------------------
   if (setting.lo_drive & 0x04){
diff --git a/si4468.c b/si4468.c
index 8a7ec13..9c57ff3 100644
--- a/si4468.c
+++ b/si4468.c
@@ -1548,7 +1548,7 @@ uint16_t set_rbw(uint16_t WISH)  {
 
 freq_t SI4463_set_freq(freq_t freq)
 {
-//  SI4463_set_gpio(3,GPIO_HIGH);       // For measuring duration of set_freq
+//  SI4463_set_gpio(3,SI446X_GPIO_MODE_DRIVE1);       // For measuring duration of set_freq
   int S = 4 ;               // Approx 100 Hz channels
   SI4463_channel = 0;
   if (freq >= 822000000 && freq <= 1130000000)         {       // 822 to 1130MHz
@@ -1624,7 +1624,7 @@ freq_t SI4463_set_freq(freq_t freq)
       SI4463_do_api(data, sizeof(data), NULL, 0);
     }
     SI4463_frequency_changed = true;
-//    SI4463_set_gpio(3,GPIO_LOW);   // For measuring duration of set_freq
+//    SI4463_set_gpio(3,SI446X_GPIO_MODE_DRIVE0);   // For measuring duration of set_freq
     return actual_freq;
   }
 #endif
@@ -1686,7 +1686,7 @@ freq_t SI4463_set_freq(freq_t freq)
   else {
     SI4463_start_rx(SI4463_channel);
   }
-//  SI4463_set_gpio(3,GPIO_LOW);        // For measuring duration of set_freq
+//  SI4463_set_gpio(3,SI446X_GPIO_MODE_DRIVE0);        // For measuring duration of set_freq
   SI4463_frequency_changed = true;
   return actual_freq;
 }
diff --git a/ui_sa.c b/ui_sa.c
index 133c187..ac5d26e 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -1689,6 +1689,16 @@ static UI_FUNCTION_ADV_CALLBACK(menu_settings_bpf_acb){
   toggle_tracking();
 }
 
+static UI_FUNCTION_ADV_CALLBACK(menu_settings_pulse_acb){
+  (void)item;
+  (void)data;
+  if(b){
+    b->icon = setting.pulse ? BUTTON_ICON_CHECK : BUTTON_ICON_NOCHECK;
+    return;
+  }
+  toggle_pulse();
+}
+
 #ifdef __HAM_BAND__
 static UI_FUNCTION_ADV_CALLBACK(menu_settings_ham_bands){
   (void)item;
@@ -2302,6 +2312,7 @@ static const menuitem_t menu_settings3[] =
 #else
   { MT_KEYPAD,   KM_10MHZ,      "CORRECT\nFREQUENCY", "Enter actual l0MHz frequency"},
   { MT_KEYPAD,   KM_GRIDLINES,  "MINIMUM\nGRIDLINES", "Enter minimum horizontal grid divisions"},
+  { MT_ADV_CALLBACK,     0,     "PULSE\nHIGH",            menu_settings_pulse_acb},
 #ifdef __USE_SERIAL_CONSOLE__
   { MT_SUBMENU,  0, "CONNECTION", menu_connection},
 #endif
@@ -2422,7 +2433,11 @@ static const menuitem_t menu_settings[] =
 #endif
 #ifdef TINYSA4
   { MT_SUBMENU | MT_LOW,0,      "MIXER\nDRIVE",      menu_mixer_drive},
-#else
+  { MT_ADV_CALLBACK,     0,     "PULSE\nHIGH",            menu_settings_pulse_acb},
+#ifdef __USE_SERIAL_CONSOLE__
+  { MT_SUBMENU,  0, "CONNECTION", menu_connection},
+#endif
+  #else
   { MT_SUBMENU | MT_LOW,0,      "MIXER\nDRIVE",      menu_lo_drive},
 #endif
   { MT_SUBMENU,  0,             S_RARROW" MORE",     menu_settings2},