diff --git a/ubitx_20/ubitx_20.ino b/ubitx_20/ubitx_20.ino
index 2ce915d..bf4c9c5 100644
--- a/ubitx_20/ubitx_20.ino
+++ b/ubitx_20/ubitx_20.ino
@@ -755,6 +755,7 @@ void doRIT(){
   }
 }
 
+/*
 void doIFShift(){
   int knob = enc_read();
   unsigned long old_freq = frequency;
@@ -770,6 +771,7 @@ void doIFShift(){
     setFrequency(frequency);
   }
 }
+*/
 
 /**
  save Frequency and mode to eeprom
@@ -1169,8 +1171,8 @@ void loop(){
   if (!inTx){
     if (ritOn)
       doRIT();
-    else if (isIFShift)
-      doIFShift();
+    //else if (isIFShift)
+    //  doIFShift();
     else 
       doTuningWithThresHold();
 
diff --git a/ubitx_20/ubitx_idle.ino b/ubitx_20/ubitx_idle.ino
index b96e567..2e1c782 100644
--- a/ubitx_20/ubitx_idle.ino
+++ b/ubitx_20/ubitx_idle.ino
@@ -122,22 +122,34 @@ void updateLine2Buffer(char isDirectCall)
   
   if (isIFShift)
   {
+    if (isDirectCall == 1)
+      for (int i = 0; i < 16; i++)
+        line2Buffer[i] = ' ';
+      
       //IFShift Offset Value 
     line2Buffer[8] = 'I';
     line2Buffer[9] = 'F';
-  
-    line2Buffer[10] = ifShiftValue >= 0 ? '+' : 0;
-    line2Buffer[11] = 0;
-    line2Buffer[12] = ' ';
-    line2Buffer[13] = ' ';
-    line2Buffer[14] = ' ';
-    line2Buffer[15] = ' ';
-  
-    //11, 12, 13, 14, 15
-    memset(b, 0, sizeof(b));
-    ltoa(ifShiftValue, b, DEC);
-    strncat(line2Buffer, b, 5);
 
+    if (ifShiftValue == 0)
+    {
+      line2Buffer[10] = 'S';
+      line2Buffer[11] = ':';
+      line2Buffer[12] = 'O';
+      line2Buffer[13] = 'F';
+      line2Buffer[14] = 'F';
+    }
+    else
+    {
+      line2Buffer[10] = ifShiftValue >= 0 ? '+' : 0;
+      line2Buffer[11] = 0;
+      line2Buffer[12] = ' ';
+    
+      //11, 12, 13, 14, 15
+      memset(b, 0, sizeof(b));
+      ltoa(ifShiftValue, b, DEC);
+      strncat(line2Buffer, b, 5);
+    }
+    
     if (isDirectCall == 1)  //if call by encoder (not scheduler), immediate print value
         printLine2(line2Buffer);    
   }
diff --git a/ubitx_20/ubitx_menu.ino b/ubitx_20/ubitx_menu.ino
index 06823ca..82b1f7a 100644
--- a/ubitx_20/ubitx_menu.ino
+++ b/ubitx_20/ubitx_menu.ino
@@ -239,6 +239,7 @@ void menuRitToggle(int btn){
   }
 }
 
+/*
 void menuIFSToggle(int btn){
   if (!btn){
     if (isIFShift == 1)
@@ -260,6 +261,69 @@ void menuIFSToggle(int btn){
       printLine2ClearAndUpdate();
   }
 }
+*/
+void menuIFSToggle(int btn){
+  int knob = 0;
+  char needApplyChangeValue = 1;
+  
+  if (!btn){
+    if (isIFShift == 1)
+      printLineF2(F("IF Shift Change?"));
+    else
+      printLineF2(F("IF Shift:Off, On?"));
+  }
+  else {
+      if (isIFShift == 0){
+        printLineF2(F("IF Shift is ON"));
+        delay_background(500, 0);
+        isIFShift = 1;
+      }
+
+      delay_background(500, 0);
+      updateLine2Buffer(1);
+      setFrequency(frequency);
+
+      //Off or Change Value
+      while(!btnDown() && digitalRead(PTT) == HIGH){
+        if (needApplyChangeValue ==1)
+        {
+          updateLine2Buffer(1);
+          setFrequency(frequency);
+        
+          if (cwMode == 0)
+            si5351bx_setfreq(0, usbCarrier + (isIFShift ? ifShiftValue : 0));  //set back the carrier oscillator anyway, cw tx switches it off
+          else
+            si5351bx_setfreq(0, cwmCarrier + (isIFShift ? ifShiftValue : 0));  //set back the carrier oscillator anyway, cw tx switches it off
+
+          needApplyChangeValue = 0;
+        }
+        
+        knob = enc_read();
+        if (knob != 0){
+          if (knob < 0)
+            ifShiftValue -= 1l;
+          else if (knob > 0)
+            ifShiftValue += 1;
+
+          needApplyChangeValue = 1;
+        }
+      }
+
+      delay_background(500, 0); //for check Long Press function key
+      
+      if (btnDown() || digitalRead(PTT) == LOW || ifShiftValue == 0)
+      {
+        isIFShift = 0;
+        printLineF2(F("IF Shift is OFF"));
+        setFrequency(frequency);
+        delay_background(500, 0);
+      }
+      
+      menuOn = 0;
+      //delay_background(500, 0);
+      printLine2ClearAndUpdate();
+  }
+}
 
 
 /* 
@@ -377,9 +441,9 @@ void menuSelectMode(int btn){
     }
 
   if (cwMode == 0)
-    si5351bx_setfreq(0, usbCarrier);  //set back the carrier oscillator anyway, cw tx switches it off
+    si5351bx_setfreq(0, usbCarrier + (isIFShift ? ifShiftValue : 0));  //set back the carrier oscillator anyway, cw tx switches it off
   else
-    si5351bx_setfreq(0, cwmCarrier);  //set back the carrier oscillator anyway, cw tx switches it off
+    si5351bx_setfreq(0, cwmCarrier + (isIFShift ? ifShiftValue : 0));  //set back the carrier oscillator anyway, cw tx switches it off
     
     setFrequency(frequency);
     delay_background(500, 0);