diff --git a/app/action.c b/app/action.c
index a4cd3ac..7c10326 100644
--- a/app/action.c
+++ b/app/action.c
@@ -243,29 +243,32 @@ void ACTION_Scan(bool bRestart)
 #endif
 
 #if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
-	static void ACTION_AlarmOr1750(const bool b1750)
-	{
-		(void)b1750;
-		gInputBoxIndex = 0;
+static void ACTION_AlarmOr1750(const bool b1750)
+{
 
-		#if defined(ENABLE_ALARM) && defined(ENABLE_TX1750)
-			gAlarmState = b1750 ? ALARM_STATE_TX1750 : ALARM_STATE_TXALARM;
-			gAlarmRunningCounter = 0;
-		#elif defined(ENABLE_ALARM)
-			gAlarmState          = ALARM_STATE_TXALARM;
-			gAlarmRunningCounter = 0;
-		#else
-			gAlarmState = ALARM_STATE_TX1750;
-		#endif
+	#if defined(ENABLE_ALARM)
+		const AlarmState_t alarm_mode = (gEeprom.ALARM_MODE == ALARM_MODE_TONE) ? ALARM_STATE_TXALARM : ALARM_STATE_SITE_ALARM;
+		gAlarmRunningCounter = 0;
+	#endif
 
-		gFlagPrepareTX = true;
+	#if defined(ENABLE_ALARM) && defined(ENABLE_TX1750)
+		gAlarmState = b1750 ? ALARM_STATE_TX1750 : alarm_mode;
+	#elif defined(ENABLE_ALARM)
+		gAlarmState = alarm_mode;
+	#else
+		gAlarmState = ALARM_STATE_TX1750;
+	#endif
 
-		if (gScreenToDisplay != DISPLAY_MENU)     // 1of11 .. don't close the menu
-			gRequestDisplayScreen = DISPLAY_MAIN;
-	}
+	(void)b1750;
+	gInputBoxIndex = 0;
+
+	gFlagPrepareTX = gAlarmState != ALARM_STATE_OFF;
+
+	if (gScreenToDisplay != DISPLAY_MENU)     // 1of11 .. don't close the menu
+		gRequestDisplayScreen = DISPLAY_MAIN;
+}
 #endif
 
-
 #ifdef ENABLE_FMRADIO
 	void ACTION_FM(void)
 	{
diff --git a/app/app.c b/app/app.c
index e8674ce..13f9a25 100644
--- a/app/app.c
+++ b/app/app.c
@@ -646,36 +646,36 @@ static void CheckRadioInterrupts(void)
 			g_CTCSS_Lost = false;
 
 		#ifdef ENABLE_VOX
-			if (interrupt_status_bits & BK4819_REG_02_VOX_LOST)
+		if (interrupt_status_bits & BK4819_REG_02_VOX_LOST)
+		{
+			g_VOX_Lost         = true;
+			gVoxPauseCountdown = 10;
+
+			if (gEeprom.VOX_SWITCH)
 			{
-				g_VOX_Lost         = true;
-				gVoxPauseCountdown = 10;
-	
-				if (gEeprom.VOX_SWITCH)
+				if (gCurrentFunction == FUNCTION_POWER_SAVE && !gRxIdleMode)
 				{
-					if (gCurrentFunction == FUNCTION_POWER_SAVE && !gRxIdleMode)
-					{
-						gPowerSave_10ms            = power_save2_10ms;
-						gPowerSaveCountdownExpired = 0;
-					}
-	
-					if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF && (gScheduleDualWatch || gDualWatchCountdown_10ms < dual_watch_count_after_vox_10ms))
-					{
-						gDualWatchCountdown_10ms = dual_watch_count_after_vox_10ms;
-						gScheduleDualWatch = false;
-	
-						// let the user see DW is not active
-						gDualWatchActive = false;
-						gUpdateStatus    = true;
-					}
+					gPowerSave_10ms            = power_save2_10ms;
+					gPowerSaveCountdownExpired = 0;
+				}
+
+				if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF && (gScheduleDualWatch || gDualWatchCountdown_10ms < dual_watch_count_after_vox_10ms))
+				{
+					gDualWatchCountdown_10ms = dual_watch_count_after_vox_10ms;
+					gScheduleDualWatch = false;
+
+					// let the user see DW is not active
+					gDualWatchActive = false;
+					gUpdateStatus    = true;
 				}
 			}
+		}
 
-			if (interrupt_status_bits & BK4819_REG_02_VOX_FOUND)
-			{
-				g_VOX_Lost         = false;
-				gVoxPauseCountdown = 0;
-			}
+		if (interrupt_status_bits & BK4819_REG_02_VOX_FOUND)
+		{
+			g_VOX_Lost         = false;
+			gVoxPauseCountdown = 0;
+		}
 		#endif
 
 		if (interrupt_status_bits & BK4819_REG_02_SQUELCH_LOST)
@@ -717,87 +717,86 @@ void APP_EndTransmission(void)
 }
 
 #ifdef ENABLE_VOX
-	static void HandleVox(void)
-	{
+static void HandleVox(void)
+{
 #ifdef ENABLE_DTMF_CALLING
-		if (gSetting_KILLED)
-			return;
+	if (gSetting_KILLED)
+		return;
 #endif
 
-		if (gVoxResumeCountdown == 0)
-		{
-			if (gVoxPauseCountdown)
-				return;
-		}
-		else
-		{
-			g_VOX_Lost         = false;
-			gVoxPauseCountdown = 0;
-		}
-	
-		#ifdef ENABLE_FMRADIO
-			if (gFmRadioMode)
-				return;
-		#endif
-	
-		if (gCurrentFunction == FUNCTION_RECEIVE || gCurrentFunction == FUNCTION_MONITOR)
+	if (gVoxResumeCountdown == 0)
+	{
+		if (gVoxPauseCountdown)
 			return;
-	
-		if (gScanStateDir != SCAN_OFF)
+	}
+	else
+	{
+		g_VOX_Lost         = false;
+		gVoxPauseCountdown = 0;
+	}
+
+	#ifdef ENABLE_FMRADIO
+		if (gFmRadioMode)
 			return;
-	
-		if (gVOX_NoiseDetected)
+	#endif
+
+	if (gCurrentFunction == FUNCTION_RECEIVE || gCurrentFunction == FUNCTION_MONITOR)
+		return;
+
+	if (gScanStateDir != SCAN_OFF)
+		return;
+
+	if (gVOX_NoiseDetected)
+	{
+		if (g_VOX_Lost)
+			gVoxStopCountdown_10ms = vox_stop_count_down_10ms;
+		else if (gVoxStopCountdown_10ms == 0)
+			gVOX_NoiseDetected = false;
+
+		if (gCurrentFunction == FUNCTION_TRANSMIT && !gPttIsPressed && !gVOX_NoiseDetected)
 		{
-			if (g_VOX_Lost)
-				gVoxStopCountdown_10ms = vox_stop_count_down_10ms;
-			else
-			if (gVoxStopCountdown_10ms == 0)
-				gVOX_NoiseDetected = false;
-	
-			if (gCurrentFunction == FUNCTION_TRANSMIT && !gPttIsPressed && !gVOX_NoiseDetected)
+			if (gFlagEndTransmission)
 			{
-				if (gFlagEndTransmission)
+				//if (gCurrentFunction != FUNCTION_FOREGROUND)
+					FUNCTION_Select(FUNCTION_FOREGROUND);
+			}
+			else
+			{
+				APP_EndTransmission();
+
+				if (gEeprom.REPEATER_TAIL_TONE_ELIMINATION == 0)
 				{
 					//if (gCurrentFunction != FUNCTION_FOREGROUND)
 						FUNCTION_Select(FUNCTION_FOREGROUND);
 				}
 				else
-				{
-					APP_EndTransmission();
-	
-					if (gEeprom.REPEATER_TAIL_TONE_ELIMINATION == 0)
-					{
-						//if (gCurrentFunction != FUNCTION_FOREGROUND)
-							FUNCTION_Select(FUNCTION_FOREGROUND);
-					}
-					else
-						gRTTECountdown = gEeprom.REPEATER_TAIL_TONE_ELIMINATION * 10;
-				}
-	
-				gUpdateStatus        = true;
-				gUpdateDisplay       = true;
-				gFlagEndTransmission = false;
+					gRTTECountdown = gEeprom.REPEATER_TAIL_TONE_ELIMINATION * 10;
 			}
-			return;
+
+			gUpdateStatus        = true;
+			gUpdateDisplay       = true;
+			gFlagEndTransmission = false;
 		}
-	
-		if (g_VOX_Lost)
+		return;
+	}
+
+	if (g_VOX_Lost)
+	{
+		gVOX_NoiseDetected = true;
+
+		if (gCurrentFunction == FUNCTION_POWER_SAVE)
+			FUNCTION_Select(FUNCTION_FOREGROUND);
+
+		if (gCurrentFunction != FUNCTION_TRANSMIT && gSerialConfigCountDown_500ms == 0)
 		{
-			gVOX_NoiseDetected = true;
-	
-			if (gCurrentFunction == FUNCTION_POWER_SAVE)
-				FUNCTION_Select(FUNCTION_FOREGROUND);
-	
-			if (gCurrentFunction != FUNCTION_TRANSMIT && gSerialConfigCountDown_500ms == 0)
-			{
 #ifdef ENABLE_DTMF_CALLING
-				gDTMF_ReplyState = DTMF_REPLY_NONE;
+			gDTMF_ReplyState = DTMF_REPLY_NONE;
 #endif
-				RADIO_PrepareTX();
-				gUpdateDisplay = true;
-			}
+			RADIO_PrepareTX();
+			gUpdateDisplay = true;
 		}
 	}
+}
 #endif
 
 void APP_Update(void)
@@ -910,23 +909,20 @@ void APP_Update(void)
 		HandleVox();
 #endif
 
-	if (gSchedulePowerSave)
-	{
-		if (
-#ifdef ENABLE_FMRADIO
-			gFmRadioMode                  ||
-#endif
-			gPttIsPressed                     ||
+	if (gSchedulePowerSave) {
+		if (gPttIsPressed                     ||
 		    gKeyBeingHeld                     ||
 			gEeprom.BATTERY_SAVE == 0         ||
 		    gScanStateDir != SCAN_OFF         ||
-		    gCssBackgroundScan                      ||
+		    gCssBackgroundScan                ||
 		    gScreenToDisplay != DISPLAY_MAIN  
+#ifdef ENABLE_FMRADIO
+			|| gFmRadioMode
+#endif
 #ifdef ENABLE_DTMF_CALLING			
 			|| gDTMF_CallState != DTMF_CALL_STATE_NONE
 #endif
-			)
-		{
+		){
 			gBatterySaveCountdown_10ms   = battery_save_count_10ms;
 		}
 		else 
@@ -1181,7 +1177,7 @@ void APP_TimeSlice10ms(void)
 	if (gCurrentFunction == FUNCTION_TRANSMIT)
 	{
 		#ifdef ENABLE_ALARM
-			if (gAlarmState == ALARM_STATE_TXALARM || gAlarmState == ALARM_STATE_ALARM)
+			if (gAlarmState == ALARM_STATE_TXALARM || gAlarmState == ALARM_STATE_SITE_ALARM)
 			{
 				uint16_t Tone;
 
@@ -1203,7 +1199,7 @@ void APP_TimeSlice10ms(void)
 
 					if (gAlarmState == ALARM_STATE_TXALARM)
 					{
-						gAlarmState = ALARM_STATE_ALARM;
+						gAlarmState = ALARM_STATE_SITE_ALARM;
 
 						RADIO_EnableCxCSS();
 						BK4819_SetupPowerAmplifier(0, 0);
@@ -1353,14 +1349,14 @@ void APP_TimeSlice500ms(void)
 
 	// Skipped authentic device check
 
-	#ifdef ENABLE_FMRADIO
-		if (gFmRadioCountdown_500ms > 0)
-		{
-			gFmRadioCountdown_500ms--;
-			if (gFmRadioMode)           // 1of11
-				return;
-		}
-	#endif
+#ifdef ENABLE_FMRADIO
+	if (gFmRadioCountdown_500ms > 0)
+	{
+		gFmRadioCountdown_500ms--;
+		if (gFmRadioMode)           // 1of11
+			return;
+	}
+#endif
 
 	if (gBacklightCountdown_500ms > 0 &&  !gAskToSave &&  !gCssBackgroundScan &&
 		// don't turn off backlight if user is in backlight menu option
@@ -1564,30 +1560,29 @@ void APP_TimeSlice500ms(void)
 }
 
 #if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
-	static void ALARM_Off(void)
-	{
-		gAlarmState = ALARM_STATE_OFF;
+static void ALARM_Off(void)
+{
+	AUDIO_AudioPathOff();
+	gEnableSpeaker = false;
 
-		AUDIO_AudioPathOff();
-		gEnableSpeaker = false;
-
-		if (gEeprom.ALARM_MODE == ALARM_MODE_TONE)
-		{
-			RADIO_SendEndOfTransmission();
-			RADIO_EnableCxCSS();
-		}
-
-		#ifdef ENABLE_VOX
-			gVoxResumeCountdown = 80;
-		#endif
-
-		SYSTEM_DelayMs(5);
-
-		RADIO_SetupRegisters(true);
-
-		if (gScreenToDisplay != DISPLAY_MENU)     // 1of11 .. don't close the menu
-			gRequestDisplayScreen = DISPLAY_MAIN;
+	if (gAlarmState == ALARM_STATE_TXALARM) {
+		RADIO_SendEndOfTransmission();
+		RADIO_EnableCxCSS();
 	}
+
+	gAlarmState = ALARM_STATE_OFF;
+
+#ifdef ENABLE_VOX
+	gVoxResumeCountdown = 80;
+#endif
+
+	SYSTEM_DelayMs(5);
+
+	RADIO_SetupRegisters(true);
+
+	if (gScreenToDisplay != DISPLAY_MENU)     // 1of11 .. don't close the menu
+		gRequestDisplayScreen = DISPLAY_MAIN;
+}
 #endif
 
 
@@ -1842,22 +1837,21 @@ static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 				}
 			}
 #if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
+			else if ((!bKeyHeld && bKeyPressed) || (gAlarmState == ALARM_STATE_TX1750 && bKeyHeld && !bKeyPressed))
+			{
+				ALARM_Off();
+
+				if (gEeprom.REPEATER_TAIL_TONE_ELIMINATION == 0)
+					FUNCTION_Select(FUNCTION_FOREGROUND);
 				else
-				if ((!bKeyHeld && bKeyPressed) || (gAlarmState == ALARM_STATE_TX1750 && bKeyHeld && !bKeyPressed))
-				{
-					ALARM_Off();
+					gRTTECountdown = gEeprom.REPEATER_TAIL_TONE_ELIMINATION * 10;
 
-					if (gEeprom.REPEATER_TAIL_TONE_ELIMINATION == 0)
-						FUNCTION_Select(FUNCTION_FOREGROUND);
-					else
-						gRTTECountdown = gEeprom.REPEATER_TAIL_TONE_ELIMINATION * 10;
-
-					if (Key == KEY_PTT)
-						gPttWasPressed  = true;
-					else
-					if (!bKeyHeld)
-						gPttWasReleased = true;
-				}
+				if (Key == KEY_PTT)
+					gPttWasPressed  = true;
+				else
+				if (!bKeyHeld)
+					gPttWasReleased = true;
+			}
 #endif
 		}
 		else if (Key != KEY_SIDE1 && Key != KEY_SIDE2) {
diff --git a/functions.c b/functions.c
index d2a4d86..5d8107d 100644
--- a/functions.c
+++ b/functions.c
@@ -174,35 +174,33 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 			gDTMF_RX_live_timeout = 0;
 			memset(gDTMF_RX_live, 0, sizeof(gDTMF_RX_live));
 
-			#if defined(ENABLE_FMRADIO)
-				if (gFmRadioMode)
-					BK1080_Init(0, false);
-			#endif
+		#if defined(ENABLE_FMRADIO)
+			if (gFmRadioMode)
+				BK1080_Init(0, false);
+		#endif
 
-			#ifdef ENABLE_ALARM
-				if (gAlarmState == ALARM_STATE_TXALARM && gEeprom.ALARM_MODE != ALARM_MODE_TONE)
-				{
-					gAlarmState = ALARM_STATE_ALARM;
+		#ifdef ENABLE_ALARM
+			if (gAlarmState == ALARM_STATE_SITE_ALARM)
+			{
+				GUI_DisplayScreen();
 
-					GUI_DisplayScreen();
+				AUDIO_AudioPathOff();
 
-					AUDIO_AudioPathOff();
+				SYSTEM_DelayMs(20);
+				BK4819_PlayTone(500, 0);
+				SYSTEM_DelayMs(2);
 
-					SYSTEM_DelayMs(20);
-					BK4819_PlayTone(500, 0);
-					SYSTEM_DelayMs(2);
+				AUDIO_AudioPathOn();
 
-					AUDIO_AudioPathOn();
+				gEnableSpeaker = true;
 
-					gEnableSpeaker = true;
+				SYSTEM_DelayMs(60);
+				BK4819_ExitTxMute();
 
-					SYSTEM_DelayMs(60);
-					BK4819_ExitTxMute();
-
-					gAlarmToneCounter = 0;
-					break;
-				}
-			#endif
+				gAlarmToneCounter = 0;
+				break;
+			}
+		#endif
 
 			gUpdateStatus = true;
 
@@ -219,24 +217,25 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 				BK4819_PlaySingleTone(2525, 250, 0, gEeprom.DTMF_SIDE_TONE);
 
 			#if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
-				if (gAlarmState != ALARM_STATE_OFF)
-				{
-					#ifdef ENABLE_TX1750
-						if (gAlarmState == ALARM_STATE_TX1750)
-							BK4819_TransmitTone(true, 1750);
-					#endif
-					#ifdef ENABLE_ALARM
-						if (gAlarmState == ALARM_STATE_TXALARM)
-							BK4819_TransmitTone(true, 500);
-					#endif
-					SYSTEM_DelayMs(2);
-					AUDIO_AudioPathOn();
-					#ifdef ENABLE_ALARM
-						gAlarmToneCounter = 0;
-					#endif
-					gEnableSpeaker = true;
-					break;
-				}
+			if (gAlarmState != ALARM_STATE_OFF) {
+				#ifdef ENABLE_TX1750
+				if (gAlarmState == ALARM_STATE_TX1750)
+					BK4819_TransmitTone(true, 1750);
+				#endif
+
+				#ifdef ENABLE_ALARM
+				if (gAlarmState == ALARM_STATE_TXALARM)
+					BK4819_TransmitTone(true, 500);
+
+				gAlarmToneCounter = 0;
+				#endif
+
+				SYSTEM_DelayMs(2);
+				AUDIO_AudioPathOn();
+				gEnableSpeaker = true;
+
+				break;
+			}
 			#endif
 
 			if (gCurrentVfo->SCRAMBLING_TYPE > 0 && gSetting_ScrambleEnable)
diff --git a/misc.h b/misc.h
index 59e70a0..05d4723 100644
--- a/misc.h
+++ b/misc.h
@@ -63,7 +63,7 @@ enum {
 enum AlarmState_t {
 	ALARM_STATE_OFF = 0,
 	ALARM_STATE_TXALARM,
-	ALARM_STATE_ALARM,
+	ALARM_STATE_SITE_ALARM,
 	ALARM_STATE_TX1750
 };
 typedef enum AlarmState_t AlarmState_t;
diff --git a/radio.c b/radio.c
index eaacfa5..b9e6bde 100644
--- a/radio.c
+++ b/radio.c
@@ -42,18 +42,19 @@ VFO_Info_t    *gCurrentVfo;
 DCS_CodeType_t gCurrentCodeType;
 VfoState_t     VfoState[2];
 
-const char gModulationStr[][4] =
-{
-	"FM",
-	"AM",
-	"USB",
+const char gModulationStr[MODULATION_UKNOWN][4] = {
+	[MODULATION_FM]="FM",
+	[MODULATION_AM]="AM",
+	[MODULATION_USB]="USB",
 	
 #ifdef ENABLE_BYP_RAW_DEMODULATORS
-	"BYP",
-	"RAW"
+	[MODULATION_BYP]="BYP",
+	[MODULATION_RAW]="RAW"
 #endif
 };
 
+
+
 bool RADIO_CheckValidChannel(uint16_t Channel, bool bCheckScanList, uint8_t VFO)
 {	// return true if the channel appears valid
 
@@ -955,31 +956,23 @@ void RADIO_SetupAGC(bool listeningAM, bool disable)
 
 void RADIO_SetVfoState(VfoState_t State)
 {
-	if (State == VFO_STATE_NORMAL)
-	{
+	if (State == VFO_STATE_NORMAL) {
 		VfoState[0] = VFO_STATE_NORMAL;
 		VfoState[1] = VFO_STATE_NORMAL;
-		gVFOStateResumeCountdown_500ms = 0;
-	}
-	else
-	{
-		if (State == VFO_STATE_VOLTAGE_HIGH)
-		{
-			VfoState[0] = VFO_STATE_VOLTAGE_HIGH;
-			VfoState[1] = VFO_STATE_TX_DISABLE;
-		}
-		else
-		{	// 1of11
-			const unsigned int vfo = (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_OFF) ? gEeprom.RX_VFO : gEeprom.TX_VFO;
-			VfoState[vfo] = State;
-		}
-
-		gVFOStateResumeCountdown_500ms = vfo_state_resume_countdown_500ms;
+	} else if (State == VFO_STATE_VOLTAGE_HIGH) {
+		VfoState[0] = VFO_STATE_VOLTAGE_HIGH;
+		VfoState[1] = VFO_STATE_TX_DISABLE;
+	} else {
+		// 1of11
+		const unsigned int vfo = (gEeprom.CROSS_BAND_RX_TX == CROSS_BAND_OFF) ? gEeprom.RX_VFO : gEeprom.TX_VFO;
+		VfoState[vfo] = State;
 	}
 
+	gVFOStateResumeCountdown_500ms = (State == VFO_STATE_NORMAL) ? 0 : vfo_state_resume_countdown_500ms;
 	gUpdateDisplay = true;
 }
 
+
 void RADIO_PrepareTX(void)
 {
 	VfoState_t State = VFO_STATE_NORMAL;  // default to OK to TX
@@ -1004,97 +997,84 @@ void RADIO_PrepareTX(void)
 
 	RADIO_SelectCurrentVfo();
 
-	#if defined(ENABLE_ALARM) && defined(ENABLE_TX1750)
-		if (gAlarmState == ALARM_STATE_OFF    ||
-		    gAlarmState == ALARM_STATE_TX1750 ||
-		   (gAlarmState == ALARM_STATE_ALARM && gEeprom.ALARM_MODE == ALARM_MODE_TONE))
-	#elif defined(ENABLE_ALARM)
-		if (gAlarmState == ALARM_STATE_OFF    ||
-		   (gAlarmState == ALARM_STATE_ALARM && gEeprom.ALARM_MODE == ALARM_MODE_TONE))
-	#elif defined(ENABLE_TX1750)
-		if (gAlarmState == ALARM_STATE_OFF    ||
-		    gAlarmState == ALARM_STATE_TX1750)
-	#endif
-	{
-		#ifndef ENABLE_TX_WHEN_AM
-			if (gCurrentVfo->Modulation != MODULATION_FM)
-			{	// not allowed to TX if in AM mode
-				State = VFO_STATE_TX_DISABLE;
-			}
-			else
+	if(TX_freq_check(gCurrentVfo->pTX->Frequency) != 0
+		#if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
+		&& gAlarmState != ALARM_STATE_SITE_ALARM
 		#endif
-		if (gSerialConfigCountDown_500ms > 0)
-		{	// TX is disabled or config upload/download in progress
-			State = VFO_STATE_TX_DISABLE;
-		}
-		else
-		if (TX_freq_check(gCurrentVfo->pTX->Frequency) == 0)
-		{	// TX frequency is allowed
-			if (gCurrentVfo->BUSY_CHANNEL_LOCK && gCurrentFunction == FUNCTION_RECEIVE)
-				State = VFO_STATE_BUSY;          // busy RX'ing a station
-			else
-			if (gBatteryDisplayLevel == 0)
-				State = VFO_STATE_BAT_LOW;       // charge your battery !
-			else
-			if (gBatteryDisplayLevel > 6)
-				State = VFO_STATE_VOLTAGE_HIGH;  // over voltage .. this is being a pain
-		}
-		else
-			State = VFO_STATE_TX_DISABLE;        // TX frequency not allowed
+	) {
+		// TX frequency not allowed
+		State = VFO_STATE_TX_DISABLE;
+	} else if (gSerialConfigCountDown_500ms > 0) {
+		// TX is disabled or config upload/download in progress
+		State = VFO_STATE_TX_DISABLE;
+	} else if (gCurrentVfo->BUSY_CHANNEL_LOCK && gCurrentFunction == FUNCTION_RECEIVE) {
+		// busy RX'ing a station
+		State = VFO_STATE_BUSY;
+	} else if (gBatteryDisplayLevel == 0) {
+		// charge your battery !git co
+		State = VFO_STATE_BAT_LOW;
+	} else if (gBatteryDisplayLevel > 6) {
+		// over voltage .. this is being a pain
+		State = VFO_STATE_VOLTAGE_HIGH;
 	}
+	#ifndef ENABLE_TX_WHEN_AM
+	else if (gCurrentVfo->Modulation != MODULATION_FM) {
+		// not allowed to TX if in AM mode
+		State = VFO_STATE_TX_DISABLE;
+	}
+	#endif
 
-	if (State != VFO_STATE_NORMAL)
-	{	// TX not allowed
+	if (State != VFO_STATE_NORMAL) {
+		// TX not allowed
 		RADIO_SetVfoState(State);
 
-		#if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
-			gAlarmState = ALARM_STATE_OFF;
-		#endif
+	#if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
+		gAlarmState = ALARM_STATE_OFF;
+	#endif
 
-#ifdef ENABLE_DTMF_CALLING
+	#ifdef ENABLE_DTMF_CALLING
 		gDTMF_ReplyState = DTMF_REPLY_NONE;
-#endif
+	#endif
 		AUDIO_PlayBeep(BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL);
 		return;
 	}
 
 	// TX is allowed
 
-#ifdef ENABLE_DTMF_CALLING
+	#ifdef ENABLE_DTMF_CALLING
 	if (gDTMF_ReplyState == DTMF_REPLY_ANI)
 	{
 		if (gDTMF_CallMode == DTMF_CALL_MODE_DTMF)
 		{
-			gDTMF_IsTx                  = true;
-			gDTMF_CallState             = DTMF_CALL_STATE_NONE;
+			gDTMF_IsTx = true;
+			gDTMF_CallState = DTMF_CALL_STATE_NONE;
 			gDTMF_TxStopCountdown_500ms = DTMF_txstop_countdown_500ms;
 		}
 		else
 		{
+			gDTMF_IsTx = false;
 			gDTMF_CallState = DTMF_CALL_STATE_CALL_OUT;
-			gDTMF_IsTx      = false;
 		}
 	}
-#endif
+	#endif
 
 	FUNCTION_Select(FUNCTION_TRANSMIT);
 
 	gTxTimerCountdown_500ms = 0;            // no timeout
 
 	#if defined(ENABLE_ALARM) || defined(ENABLE_TX1750)
-		if (gAlarmState == ALARM_STATE_OFF)
+	if (gAlarmState == ALARM_STATE_OFF)
 	#endif
 	{
 		if (gEeprom.TX_TIMEOUT_TIMER == 0)
 			gTxTimerCountdown_500ms = 60;   // 30 sec
-		else
-		if (gEeprom.TX_TIMEOUT_TIMER < (ARRAY_SIZE(gSubMenu_TOT) - 1))
+		else if (gEeprom.TX_TIMEOUT_TIMER < (ARRAY_SIZE(gSubMenu_TOT) - 1))
 			gTxTimerCountdown_500ms = 120 * gEeprom.TX_TIMEOUT_TIMER;  // minutes
 		else
 			gTxTimerCountdown_500ms = 120 * 15;  // 15 minutes
 	}
-	gTxTimeoutReached    = false;
 
+	gTxTimeoutReached    = false;
 	gFlagEndTransmission = false;
 	gRTTECountdown       = 0;
 
diff --git a/radio.h b/radio.h
index 64429c4..3b5f8b2 100644
--- a/radio.h
+++ b/radio.h
@@ -50,7 +50,8 @@ enum VfoState_t
 	VFO_STATE_TX_DISABLE,
 	VFO_STATE_TIMEOUT,
 	VFO_STATE_ALARM,
-	VFO_STATE_VOLTAGE_HIGH
+	VFO_STATE_VOLTAGE_HIGH,
+	_VFO_STATE_LAST_ELEMENT
 };
 typedef enum VfoState_t VfoState_t;
 
diff --git a/ui/main.c b/ui/main.c
index 103f103..6c20ec3 100644
--- a/ui/main.c
+++ b/ui/main.c
@@ -51,6 +51,16 @@ const int8_t dBmCorrTable[7] = {
 			 -1  // band 7
 		};
 
+const char *VfoStateStr[] = {
+       [VFO_STATE_NORMAL]="",
+       [VFO_STATE_BUSY]="BUSY",
+       [VFO_STATE_BAT_LOW]="BAT LOW",
+       [VFO_STATE_TX_DISABLE]="TX DISABLE",
+       [VFO_STATE_TIMEOUT]="TIMEOUT",
+       [VFO_STATE_ALARM]="ALARM",
+       [VFO_STATE_VOLTAGE_HIGH]="VOLT HIGH"
+};
+
 // ***************************************************************************
 
 static void DrawSmallAntennaAndBars(uint8_t *p, unsigned int level)
@@ -303,10 +313,7 @@ void UI_MAIN_TimeSlice500ms(void)
 
 void UI_DisplayMain(void)
 {
-	const unsigned int line0 = 0;  // text screen line
-	const unsigned int line1 = 4;
 	char               String[22];
-	unsigned int       vfo_num;
 
 	center_line = CENTER_LINE_NONE;
 
@@ -329,8 +336,10 @@ void UI_DisplayMain(void)
 							
 	unsigned int activeTxVFO = gRxVfoIsActive ? gEeprom.RX_VFO : gEeprom.TX_VFO;
 
-	for (vfo_num = 0; vfo_num < 2; vfo_num++)
+	for (unsigned int vfo_num = 0; vfo_num < 2; vfo_num++)
 	{
+		const unsigned int line0 = 0;  // text screen line
+		const unsigned int line1 = 4;
 		const unsigned int line       = (vfo_num == 0) ? line0 : line1;
 		const bool         isMainVFO   = (vfo_num == gEeprom.TX_VFO);
 		uint8_t           *p_line0    = gFrameBuffer[line + 0];
@@ -416,7 +425,7 @@ void UI_DisplayMain(void)
 		{	// transmitting
 
 #ifdef ENABLE_ALARM
-			if (gAlarmState == ALARM_STATE_ALARM)
+			if (gAlarmState == ALARM_STATE_SITE_ALARM)
 				mode = 2;
 			else
 #endif
@@ -483,10 +492,10 @@ void UI_DisplayMain(void)
 
 		// ************
 
-		unsigned int state = VfoState[vfo_num];
+		enum VfoState_t state = VfoState[vfo_num];
 
 #ifdef ENABLE_ALARM
-		if (gCurrentFunction == FUNCTION_TRANSMIT && gAlarmState == ALARM_STATE_ALARM) {
+		if (gCurrentFunction == FUNCTION_TRANSMIT && gAlarmState == ALARM_STATE_SITE_ALARM) {
 			if (activeTxVFO == vfo_num)
 				state = VFO_STATE_ALARM;
 		}
@@ -496,9 +505,8 @@ void UI_DisplayMain(void)
 
 		if (state != VFO_STATE_NORMAL)
 		{
-			const char *state_list[] = {"", "BUSY", "BAT LOW", "TX DISABLE", "TIMEOUT", "ALARM", "VOLT HIGH"};
-			if (state < ARRAY_SIZE(state_list))
-				UI_PrintString(state_list[state], 31, 0, line, 8);
+			if (state < ARRAY_SIZE(VfoStateStr))
+				UI_PrintString(VfoStateStr[state], 31, 0, line, 8);
 		}
 		else if (gInputBoxIndex > 0 && IS_FREQ_CHANNEL(gEeprom.ScreenChannel[vfo_num]) && gEeprom.TX_VFO == vfo_num)
 		{	// user entering a frequency