diff --git a/src/protocols/AFSK/AFSK.cpp b/src/protocols/AFSK/AFSK.cpp
index bbf25b3a..6d7e518d 100644
--- a/src/protocols/AFSK/AFSK.cpp
+++ b/src/protocols/AFSK/AFSK.cpp
@@ -5,6 +5,11 @@ AFSKClient::AFSKClient(PhysicalLayer* phy, uint32_t pin): outPin(pin) {
   phyLayer = phy;
 }
 
+AFSKClient::AFSKClient(AFSKClient* aud) {
+  phyLayer = aud->phyLayer;
+  outPin = aud->outPin;
+}
+
 int16_t AFSKClient::begin() {
   return(phyLayer->startDirect());
 }
diff --git a/src/protocols/AFSK/AFSK.h b/src/protocols/AFSK/AFSK.h
index cdf6ebca..3b69f308 100644
--- a/src/protocols/AFSK/AFSK.h
+++ b/src/protocols/AFSK/AFSK.h
@@ -22,6 +22,12 @@ class AFSKClient  {
     */
     AFSKClient(PhysicalLayer* phy, uint32_t pin);
 
+    /*!
+      \brief Copy contructor.
+      \param aud Pointer to the AFSKClient instance to copy.
+    */
+    AFSKClient(AFSKClient* aud);
+
     /*!
       \brief Initialization method.
       \returns \ref status_codes
@@ -56,6 +62,7 @@ class AFSKClient  {
     friend class SSTVClient;
     friend class AX25Client;
     friend class FSK4Client;
+    friend class BellClient;
 };
 
 #endif