diff --git a/Multiprotocol/JJRC345_nrf24l01.ino b/Multiprotocol/JJRC345_nrf24l01.ino
index fdcf3f210..07f16f056 100644
--- a/Multiprotocol/JJRC345_nrf24l01.ino
+++ b/Multiprotocol/JJRC345_nrf24l01.ino
@@ -18,7 +18,7 @@
 
 #include "iface_nrf24l01.h"
 
-#define JJRC345_FORCE_ID
+//#define JJRC345_FORCE_ID
 
 #define JJRC345_PACKET_PERIOD		7450 // Timeout for callback in uSec
 #define JJRC345_INITIAL_WAIT		500
@@ -37,15 +37,15 @@ enum JJRC345_FLAGS {
 static uint8_t __attribute__((unused)) JJRC345_convert_channel(uint8_t num)
 {
 	uint8_t val=convert_channel_8b(num);
-	// 70..60..41..01, 80 center, 81..C1..E0..F0
+	// 7E..60..41..01, 80 center, 81..C1..E0..FE
 	if(val<0x80)
 	{
 		val=0x80-val;	// 80..01
-		if(val>0x70)
-			val=0x70;	// 70..01
+		if(val>0x7E)
+			val=0x7E;	// 7E..01
 	}
-	else if(val>0xF0)
-		val=0xF0;			// 81..F0
+	else if(val>0xFE)
+		val=0xFE;			// 81..FE
 	return val;
 }
 
@@ -55,7 +55,6 @@ static void __attribute__((unused)) JJRC345_send_packet()
 	packet[2] = 0x00;
 	if (IS_BIND_IN_PROGRESS)
 	{ //00 05 00 0A 46 4A 41 47 00 00 40 46 A5 4A F1 18
-		debug("CH:%d,",JJRC345_RF_BIND_CHANNEL);
 		packet[1]  = JJRC345_RF_BIND_CHANNEL;
 		packet[4]  = hopping_frequency[0];
 		packet[5]  = hopping_frequency[1];
@@ -66,7 +65,6 @@ static void __attribute__((unused)) JJRC345_send_packet()
 	else
 	{ //00 41 00 0A 00 80 80 80 00 00 40 46 00 49 F1 18
 		NRF24L01_WriteReg(NRF24L01_05_RF_CH, hopping_frequency[hopping_frequency_no]);
-		debug("CH:%d,", hopping_frequency[hopping_frequency_no]);
 		hopping_frequency_no++;
 		hopping_frequency_no %= JJRC345_NUM_CHANNELS;
 		packet[1]  = hopping_frequency[hopping_frequency_no];	// next packet will be sent on this channel
@@ -78,19 +76,20 @@ static void __attribute__((unused)) JJRC345_send_packet()
 
 		if(CH5_SW)	//Flip
 		{
-			if(packet[6]>90)
+			if(packet[6]>0x90)
 				packet[6]=0xFF;
-			else if(packet[6]<80 && packet[6]>10)
+			else if(packet[6]<0x80 && packet[6]>0x10)
 				packet[6]=0x7F;
-			else if(packet[7]>90)
+			else if(packet[7]>0x90)
 				packet[7]=0xFF;
-			else if(packet[7]<80 && packet[7]>10)
+			else if(packet[7]<0x80 && packet[7]>0x10)
 				packet[7]=0x7F;
 		}
 		
 		packet[12] = 0x02;										// Rate: 00-01-02
 	}
-	packet[3] = (packet[4] >= 0xB7) ? 0x0e : 0x0a;				// Some flag or check... 0A when Thr <= B6, 0E when Thr >= B7, sometimes 06 when moving Ele/Ail
+
+	packet[3] = 0x00;											// Checksum upper bits
 
 	packet[8] = 0x00											// Rudder trim, 00 when not used, 01..1F when trimmed left, 20..3F
 				| GET_FLAG(CH6_SW,JJRC345_FLAG_HEADLESS)		// Headless mode: 00 normal, 40 headless
@@ -101,19 +100,15 @@ static void __attribute__((unused)) JJRC345_send_packet()
 	packet[11] = hopping_frequency[0];							// First hopping frequency
 
 	// Checksum
-	packet[13] = 0x02-packet[3];
+	uint16_t sum=2;
 	for (uint8_t i = 0; i < 13; i++)
-	{
-		debug(" %02X", packet[i]);
-		packet[13] += packet[i];
-	}
-	debug("%02X ", packet[13]);
+		sum += packet[i];
+	packet[13]=sum;
+	packet[3]=((sum>>8)<<2)+2;
 	
 	// TX ID
 	packet[14] = rx_tx_addr[2];
-	debug(" %02X", packet[14]);
 	packet[15] = rx_tx_addr[3];
-	debugln(" %02X", packet[15]);
 
 	// Power on, TX mode
 	XN297_Configure(_BV(NRF24L01_00_EN_CRC) | _BV(NRF24L01_00_CRCO) | _BV(NRF24L01_00_PWR_UP));