diff --git a/src/extras/RFControl.cpp b/src/extras/RFControl.cpp
index 7f62c81..ce2ce88 100644
--- a/src/extras/RFControl.cpp
+++ b/src/extras/RFControl.cpp
@@ -36,6 +36,8 @@ RFControl::RFControl(uint8_t pin, boolean refClock){
 
   // If specified, set the base clock to 1 MHz so tick-units are in microseconds (before any CLK_DIV is applied), otherwise default will be 80 MHz APB clock
 
+  this->refClock=refClock;
+  
   if(refClock)
 #ifdef CONFIG_IDF_TARGET_ESP32C3
   REG_SET_FIELD(RMT_SYS_CONF_REG,RMT_SCLK_DIV_NUM,79);        // ESP32-C3 does not have a 1 MHz REF Tick Clock, but allows the 80 MHz APB clock to be scaled by an additional RMT-specific divider
@@ -100,4 +102,40 @@ void RFControl::phase(uint32_t nTicks, uint8_t phase){
 
 ///////////////////
 
+void RFControl::enableCarrier(uint32_t freq, float duty){
+
+  if(duty<0)
+    duty=0;
+  if(duty>1)
+    duty=1;
+
+  if(freq>0){
+    float period=1.0e6/freq*(refClock?1:80);
+    uint32_t highTime=period*duty+0.5;
+    uint32_t lowTime=period*(1.0-duty)+0.5;
+
+    if(highTime>0xFFFF || lowTime>0xFFFF){
+      Serial.printf("\n*** ERROR:  Can't enable carrier frequency=%d Hz for RF Control pin=%d, duty=%0.2f. Frequency is too low!\n\n",freq,config->gpio_num,duty);
+      return;      
+    }
+
+    if(highTime==0){
+      Serial.printf("\n*** ERROR:  Can't enable carrier frequency=%d Hz for RF Control pin=%d, duty=%0.2f. Duty is too low or frequency is too high!\n\n",freq,config->gpio_num,duty);
+      return;
+    }
+    
+    if(lowTime==0){
+      Serial.printf("\n*** ERROR:  Can't enable carrier frequency=%d Hz for RF Control pin=%d, duty=%0.2f. Duty is too high or frequency is too high!\n\n",freq,config->gpio_num,duty);
+      return;
+    }
+
+//    Serial.printf("%d %g %d %d\n",freq,period,highTime,lowTime);
+    rmt_set_tx_carrier(config->channel,true,highTime,lowTime,RMT_CARRIER_LEVEL_HIGH);       
+  } else {
+    rmt_set_tx_carrier(config->channel,false,0,0,RMT_CARRIER_LEVEL_HIGH);           
+  }
+}
+
+///////////////////
+
 uint8_t RFControl::nChannels=0;
diff --git a/src/extras/RFControl.h b/src/extras/RFControl.h
index 5ca787f..c099935 100644
--- a/src/extras/RFControl.h
+++ b/src/extras/RFControl.h
@@ -13,6 +13,7 @@ class RFControl {
     rmt_config_t *config=NULL;
     vector<uint32_t> data;
     boolean lowWord=true;
+    boolean refClock;
     static uint8_t nChannels;
                                
   public:    
@@ -24,6 +25,8 @@ class RFControl {
     void clear();                                         // clears transmitter memory
     void add(uint32_t onTime, uint32_t offTime);          // adds pulse of onTime ticks HIGH followed by offTime ticks LOW
     void phase(uint32_t nTicks, uint8_t phase);           // adds either a HIGH phase or LOW phase lasting numTicks ticks
+    void enableCarrier(uint32_t freq, float duty=0.5);    // enables carrier wave if freq>0, else disables carrier wave; duty is a fraction from 0-1
+    void disableCarrier(){enableCarrier(0);}              // disables carrier wave
 };
 
 // Helper macro for creating your own storage of uint32_t data array elements - used with first variation of start() above
diff --git a/src/extras/extras.ino b/src/extras/extras.ino
index f104b67..4640ae7 100644
--- a/src/extras/extras.ino
+++ b/src/extras/extras.ino
@@ -14,12 +14,21 @@ void setup() {
 
   rf.clear();
 
-  rf.add(10000,10000);
-  rf.add(10000,10000);
-  rf.add(10000,30000);
+//  rf.add(1000000,1000000);
+//  rf.add(1000000,1000000);
+  rf.add(100000,1);
+
+  for(int i=100;i>=0;i-=5){
+    rf.enableCarrier(38000,i/100.0);
+    rf.start(1,4);
+  }
+//  rf.disableCarrier();
+//  rf.start(1,200);
+
+  while(1);
 
   uint32_t t0=micros();
-  rf.start(4,1);
+  rf.start(4,80);
   uint32_t t1=micros();
    
   Serial.println("End Example");