diff --git a/Multiprotocol/Multiprotocol.h b/Multiprotocol/Multiprotocol.h
index ff498b9..06c0231 100644
--- a/Multiprotocol/Multiprotocol.h
+++ b/Multiprotocol/Multiprotocol.h
@@ -19,7 +19,7 @@
 #define VERSION_MAJOR		1
 #define VERSION_MINOR		2
 #define VERSION_REVISION	1
-#define VERSION_PATCH_LEVEL	50
+#define VERSION_PATCH_LEVEL	51
 
 //******************
 // Protocols
diff --git a/Multiprotocol/WFLY_cyrf6936.ino b/Multiprotocol/WFLY_cyrf6936.ino
index ddc59d2..1742768 100644
--- a/Multiprotocol/WFLY_cyrf6936.ino
+++ b/Multiprotocol/WFLY_cyrf6936.ino
@@ -155,6 +155,9 @@ uint16_t ReadWFLY()
 	uint8_t status,len,sum=0,check=0;
 	uint8_t start;
 	static uint8_t retry;
+	#ifdef USE_CYRF6936_CH15_TUNING
+		static uint16_t Channel15=1024;
+	#endif
 
 	switch(phase)
 	{
@@ -236,6 +239,15 @@ uint16_t ReadWFLY()
 			while ((uint8_t)((uint8_t)micros()-(uint8_t)start) < 200)
 				if((CYRF_ReadRegister(CYRF_02_TX_CTRL) & 0x80) == 0x00)
 					break;										// Packet transmission complete
+			#ifdef USE_CYRF6936_CH15_TUNING
+				if(Channel15!=Channel_data[CH15])
+				{ // adjust frequency
+					Channel15=Channel_data[CH15]+0x155;	// default value is 0x555 = 0x400 + 0x155
+					CYRF_WriteRegister(CYRF_1B_TX_OFFSET_LSB, Channel15&0xFF);
+					CYRF_WriteRegister(CYRF_1C_TX_OFFSET_MSB, Channel15>>8);
+					Channel15-=0x155;
+				}
+			#endif
 			return WFLY_send_data_packet();
 	}
 	return 1000;
@@ -253,7 +265,7 @@ uint16_t initWFLY()
 		rx_tx_addr[2]=0xBF;					// ID
 		rx_tx_addr[3]=0x13;					// ID
 		ch=0x16;							// value seen between 0x0A and 0x17
-		rc_ch_num=0x15						// RF channel to send the current hopping table
+		rf_ch_num=0x15						// RF channel to send the current hopping table
 	#endif
 
 	debug("ID:")
diff --git a/Multiprotocol/_Config.h b/Multiprotocol/_Config.h
index 7116405..808a54d 100644
--- a/Multiprotocol/_Config.h
+++ b/Multiprotocol/_Config.h
@@ -109,6 +109,12 @@
 //#define FORCE_AFHDS2A_TUNING	0
 //#define FORCE_BUGS_TUNING	0
 
+/** CYRF6936 Fine Frequency Tuning **/
+//This is required in rare cases where some CYRF6936 modules and/or RXs have an inaccurate crystal oscillator.
+//If using Serial mode only (for now), you can use CH15 to find the right tuning value. -100%=-300, 0%=default 0, +100%=+300.
+//Uncomment the line below (remove the "//") to enable this feature.
+//#define USE_CYRF6936_CH15_TUNING
+
 /** Low Power **/
 //Low power is reducing the transmit power of the multi module. This setting is configurable per model in PPM (table below) or Serial mode (radio GUI).
 //It can be activated when flying indoor or small models since the distance is short or if a model is causing issues when flying closed to the TX.