diff --git a/app/app.c b/app/app.c
index 5a8d112..26cf97a 100644
--- a/app/app.c
+++ b/app/app.c
@@ -1711,16 +1711,22 @@ void APP_TimeSlice500ms(void)
 
 	if (gDTMF_RX_live_timeout > 0)
 	{
-		if (--gDTMF_RX_live_timeout == 0)
+		#ifdef ENABLE_RSSI_BAR
+			if (center_line == CENTER_LINE_DTMF_DEC ||
+				center_line == CENTER_LINE_NONE)  // wait till the center line is free for us to use before timing out
+		#endif
 		{
-			if (gDTMF_RX_live[0] != 0)
+			if (--gDTMF_RX_live_timeout == 0)
 			{
-				memset(gDTMF_RX_live, 0, sizeof(gDTMF_RX_live));
-				gUpdateDisplay   = true;
+				if (gDTMF_RX_live[0] != 0)
+				{
+					memset(gDTMF_RX_live, 0, sizeof(gDTMF_RX_live));
+					gUpdateDisplay   = true;
+				}
 			}
 		}
 	}
-
+	
 	if (gDTMF_RX_timeout > 0)
 		if (--gDTMF_RX_timeout == 0)
 			DTMF_clear_RX();
diff --git a/app/dtmf.c b/app/dtmf.c
index fc1954e..19353b9 100644
--- a/app/dtmf.c
+++ b/app/dtmf.c
@@ -403,13 +403,12 @@ void DTMF_Reply(void)
 	if (pString == NULL)
 		return;
 
-	Delay = gEeprom.DTMF_PRELOAD_TIME;
+	Delay = (gEeprom.DTMF_PRELOAD_TIME < 200) ? 200 : gEeprom.DTMF_PRELOAD_TIME;
 
 	if (gEeprom.DTMF_SIDE_TONE)
-	{	// the will also hear the transmitted tones
+	{	// the user will also hear the transmitted tones
 		GPIO_SetBit(&GPIOC->DATA, GPIOC_PIN_AUDIO_PATH);
 		gEnableSpeaker = true;
-		Delay = (gEeprom.DTMF_PRELOAD_TIME < 60) ? 60 : gEeprom.DTMF_PRELOAD_TIME;
 	}
 
 	SYSTEM_DelayMs(Delay);
diff --git a/driver/bk4819.c b/driver/bk4819.c
index 0090c2e..5f654b5 100644
--- a/driver/bk4819.c
+++ b/driver/bk4819.c
@@ -913,7 +913,7 @@ void BK4819_EnableDTMF(void)
 	// REG_24 <3:0>  14 Max symbol number for SelCall detection
 
 //	const uint16_t threshold = 24;    // doesn't decode non-QS radios
-	const uint16_t threshold = 140;   // but 128 ~ 247 does
+	const uint16_t threshold = 200;   // but 128 ~ 247 does
 	BK4819_WriteRegister(BK4819_REG_24,                // 1 00011000 1 1 1 1110
 		  (1u        << BK4819_REG_24_SHIFT_UNKNOWN_15)
 		| (threshold << BK4819_REG_24_SHIFT_THRESHOLD)      // 0 ~ 255
diff --git a/firmware.bin b/firmware.bin
index d2c5ec5..0971643 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index 8576750..b7b70f9 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ
diff --git a/radio.c b/radio.c
index 538200b..2b3235a 100644
--- a/radio.c
+++ b/radio.c
@@ -564,8 +564,8 @@ void RADIO_SetupRegisters(bool bSwitchToFunction0)
 		case BK4819_FILTER_BW_WIDE:
 		case BK4819_FILTER_BW_NARROW:
 			#ifdef ENABLE_AM_FIX
-				BK4819_SetFilterBandwidth(Bandwidth, gRxVfo->AM_mode && gSetting_AM_fix);
-//				BK4819_SetFilterBandwidth(Bandwidth, false);
+//				BK4819_SetFilterBandwidth(Bandwidth, gRxVfo->AM_mode && gSetting_AM_fix);
+				BK4819_SetFilterBandwidth(Bandwidth, true);
 			#else
 				BK4819_SetFilterBandwidth(Bandwidth, false);
 			#endif
@@ -732,6 +732,7 @@ void RADIO_SetupRegisters(bool bSwitchToFunction0)
 	#else
 		if (gCurrentFunction != FUNCTION_TRANSMIT)
 		{
+			BK4819_DisableDTMF();
 			BK4819_EnableDTMF();
 			InterruptMask |= BK4819_REG_3F_DTMF_5TONE_FOUND;
 		}
@@ -812,8 +813,8 @@ void RADIO_SetTxParameters(void)
 		case BK4819_FILTER_BW_WIDE:
 		case BK4819_FILTER_BW_NARROW:
 			#ifdef ENABLE_AM_FIX
-				BK4819_SetFilterBandwidth(Bandwidth, gCurrentVfo->AM_mode && gSetting_AM_fix);
-//				BK4819_SetFilterBandwidth(Bandwidth, false);
+//				BK4819_SetFilterBandwidth(Bandwidth, gCurrentVfo->AM_mode && gSetting_AM_fix);
+				BK4819_SetFilterBandwidth(Bandwidth, true);
 			#else
 				BK4819_SetFilterBandwidth(Bandwidth, false);
 			#endif
diff --git a/ui/main.c b/ui/main.c
index 2534fd3..6512816 100644
--- a/ui/main.c
+++ b/ui/main.c
@@ -36,17 +36,6 @@
 #include "ui/main.h"
 #include "ui/ui.h"
 
-enum center_line_t {
-	CENTER_LINE_NONE = 0,
-	CENTER_LINE_IN_USE,
-	CENTER_LINE_AUDIO_BAR,
-	CENTER_LINE_RSSI,
-	CENTER_LINE_AM_FIX_DATA,
-	CENTER_LINE_DTMF_DEC,
-	CENTER_LINE_CHARGE_DATA
-};
-typedef enum center_line_t center_line_t;
-
 center_line_t center_line = CENTER_LINE_NONE;
 
 // ***************************************************************************
diff --git a/ui/main.h b/ui/main.h
index 3c5b27d..80024f9 100644
--- a/ui/main.h
+++ b/ui/main.h
@@ -17,6 +17,19 @@
 #ifndef UI_MAIN_H
 #define UI_MAIN_H
 
+enum center_line_t {
+	CENTER_LINE_NONE = 0,
+	CENTER_LINE_IN_USE,
+	CENTER_LINE_AUDIO_BAR,
+	CENTER_LINE_RSSI,
+	CENTER_LINE_AM_FIX_DATA,
+	CENTER_LINE_DTMF_DEC,
+	CENTER_LINE_CHARGE_DATA
+};
+typedef enum center_line_t center_line_t;
+
+extern center_line_t center_line;
+
 void UI_DisplayAudioBar(void);
 void UI_UpdateRSSI(const int16_t rssi, const int vfo);
 void UI_DisplayMain(void);