diff --git a/src/extras/RFControl.cpp b/src/extras/RFControl.cpp
index bfb195d..5938089 100644
--- a/src/extras/RFControl.cpp
+++ b/src/extras/RFControl.cpp
@@ -32,7 +32,12 @@ RFControl::RFControl(int pin){
 ///////////////////
 
 void RFControl::start(uint8_t _numCycles, uint8_t tickTime){
-  pRMT[pCount]=0;                                             // load end-marker (zero bytes) into RMT memory
+
+  if(pCount%2==0)                                             // if next entry is lower 16 bits of 32-bit memory
+    pRMT[pCount/2]=0;                                         // set memory to zero (end-marker)
+  else
+    pRMT[pCount/2]&=0xFFFF;                                   // else preserve lower 16 bits and zero our upper 16 bits
+  
   REG_WRITE(GPIO_ENABLE_W1TS_REG,1<<pin);                     // enable output on pin
   numCycles=_numCycles;                                       // set number of cycles to repeat transmission
   REG_SET_FIELD(RMT_CH0CONF0_REG,RMT_DIV_CNT_CH0,tickTime);   // set one tick = 1 microsecond * tickTime (RMT will be set to use 1 MHz REF_TICK, not 80 MHz APB_CLK)    
@@ -50,21 +55,35 @@ void RFControl::clear(){
 ///////////////////
 
 void RFControl::add(uint16_t onTime, uint16_t offTime){
-  
-  if(pCount==511){                                            // maximum number of pulses reached (saving one space for end-marker)
-    Serial.print("\n*** ERROR: Can't add more than 511 pulses to RF Control Module\n\n");
+
+  phase(onTime,RF_HIGH);
+  phase(offTime,RF_LOW);  
+}
+
+///////////////////
+
+void RFControl::phase(uint16_t numTicks, PHASE phase){
+
+  if(pCount==1023){                                            // maximum number of entries reached (saving one space for end-marker)
+    Serial.print("\n*** ERROR: Can't add more than 1023 entries to RF Control Module\n\n");
   } else
   
-  if(offTime>32767 || offTime<1 || onTime>32767 || onTime<1){
-    Serial.print("\n*** ERROR: Request to add RF Control pulse with onTime=");
-    Serial.print(onTime);
-    Serial.print(" and offTime=");
-    Serial.print(offTime);
+  if(numTicks>32767 || numTicks<1){
+    Serial.print("\n*** ERROR: Request to add RF Control entry with numTicks=");
+    Serial.print(numTicks);
     Serial.print(" is out of allowable range: 1-32767\n\n");
   } else {
+
+    int index=pCount/2;
     
-    pRMT[pCount++]=(offTime<<16)+onTime+(1<<15);              // load pulse information into RMT memory and increment pointer      
+    if(pCount%2==0)                                             
+      pRMT[index]=numTicks | (int)phase;                                      // load entry into lower 16 bits of 32-bit memory           
+    else
+      pRMT[index]=pRMT[index] & 0xFFFF | (numTicks<<16) | ((int)phase<<16);   // load entry into upper 16 bits of 32-bit memory, preserving lower 16 bits
+
+    pCount++;
   }
+
 }
 
 ///////////////////
@@ -82,3 +101,5 @@ boolean RFControl::configured=false;
 volatile int RFControl::numCycles;
 uint32_t *RFControl::pRMT=(uint32_t *)RMT_CHANNEL_MEM(0);
 int RFControl::pCount=0;
+RFControl::PHASE RF_LOW=RFControl::PHASE::Low;
+RFControl::PHASE RF_HIGH=RFControl::PHASE::High;
diff --git a/src/extras/RFControl.h b/src/extras/RFControl.h
index 9f35d15..99a3433 100644
--- a/src/extras/RFControl.h
+++ b/src/extras/RFControl.h
@@ -12,11 +12,20 @@ class RFControl {
     static int pCount;
     static void eot_int(void *arg);                         
 
-  public:  
+  public:    
+
+    enum class PHASE {
+      Low=0,
+      High=0x8000
+    };
+
     RFControl(int pin);                                     // creates transmitter on pin
     static void clear();                                    // clears transmitter memory
     static void add(uint16_t onTime, uint16_t offTime);     // adds pulse of onTime ticks HIGH followed by offTime ticks LOW
+    static void phase(uint16_t numTicks, PHASE phase);      // adds either a HIGH phase or LOW phase lasting numTicks ticks
     void start(uint8_t _numCycles, uint8_t tickTime=1);     // starts transmission of pulses, repeated for numCycles, where each tick in pulse is tickTime microseconds long
 };
 
+extern RFControl::PHASE RF_LOW;
+extern RFControl::PHASE RF_HIGH;
    
diff --git a/src/extras/extras.ino b/src/extras/extras.ino
index 8d8b76d..1f85782 100644
--- a/src/extras/extras.ino
+++ b/src/extras/extras.ino
@@ -1,5 +1,30 @@
 
-#error THIS IS NOT COMPILABLE CODE
+// This is a placeholder .ino file that allows you to easily edit the contents of this library using the Arduino IDE,
+// as well as compile and test from this point.  This file is ignored when the library is included in other sketches.
 
-This is a dummy .ino file that allows you to easily edit the contents of this library using the Arduino IDE.
-The code is NOT designed to be compiled from this point.  Compile and test the library using one of the examples.
+#include "RFControl.h"
+
+void setup(){
+
+  Serial.begin(115200);
+  delay(1000);
+
+  Serial.print("\n\nTest sketch for HomeSpan Extras Library\n\n");
+
+  RFControl rf(4);
+
+  Serial.println("Starting...");
+  
+  rf.clear();
+  for(int i=0;i<3;i++)
+    rf.add(2000,2000);
+  rf.phase(10000,RF_LOW); 
+  rf.start(5,100);
+  
+  Serial.println("Done!");
+  
+}
+
+void loop(){
+  
+}