diff --git a/README.md b/README.md
index d14c8d5..72d1c7e 100644
--- a/README.md
+++ b/README.md
@@ -64,13 +64,13 @@ make
 To compile directly in windows without the need of a linux virtual machine:
 
 ```
-* Download and install "gcc-arm-none-eabi-10.3-2021.10-win32.exe" from https://developer.arm.com/downloads/-/gnu-rm
-* Download and install "gnu_make-3.81.exe" from https://gnuwin32.sourceforge.net/packages/make.htm
+1. Download and install "gcc-arm-none-eabi-10.3-2021.10-win32.exe" from https://developer.arm.com/downloads/-/gnu-rm
+2. Download and install "gnu_make-3.81.exe" from https://gnuwin32.sourceforge.net/packages/make.htm
+3. You may (or may not) need to reboot your PC after installing the above
 ```
 
-You may (or may not) need to reboot your PC after installing the above.
-
-Run 'win_make.bat' from the directory you saved this source code too, you may have to edit the bat file depending on where you installed 'gnu_make' too
+Then you can run 'win_make.bat' from the directory you saved this source code too.
+You may need to edit the bat file (path to make.exe) depending on where you installed 'gnu_make' too.
 
 # Credits
 
diff --git a/app/app.c b/app/app.c
index 3b26211..e5cc76b 100644
--- a/app/app.c
+++ b/app/app.c
@@ -1280,18 +1280,21 @@ void APP_TimeSlice500ms(void)
 {
 	// Skipped authentic device check
 
-	if (gBacklightCountdown > 0)
-		if (--gBacklightCountdown == 0)
-			if (gEeprom.BACKLIGHT < 5)
-				GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_BACKLIGHT);   // turn backlight off
-			
-	if (gKeypadLocked)
+	if (gCurrentFunction != FUNCTION_TRANSMIT)
+	{
+		if (gBacklightCountdown > 0)
+			if (--gBacklightCountdown == 0)
+				if (gEeprom.BACKLIGHT < 5)
+					GPIO_ClearBit(&GPIOB->DATA, GPIOB_PIN_BACKLIGHT);   // turn backlight off
+	}
+	
+	if (gKeypadLocked > 0)
 		if (--gKeypadLocked == 0)
 			gUpdateDisplay = true;
 
 	// Skipped authentic device check
 
-	if (gFmRadioCountdown)
+	if (gFmRadioCountdown > 0)
 	{
 		gFmRadioCountdown--;
 		return;
@@ -1326,7 +1329,7 @@ void APP_TimeSlice500ms(void)
 			gCurrentRSSI = BK4819_GetRSSI();
 			UI_UpdateRSSI(gCurrentRSSI);
 		}
-		else
+//		else
 		{
 			if ((gFM_ScanState == FM_SCAN_OFF || gAskToSave) && gScanState == SCAN_OFF && gCssScanMode == CSS_SCAN_MODE_OFF)
 			{
@@ -1344,7 +1347,7 @@ void APP_TimeSlice500ms(void)
 						gUpdateStatus = true;
 					}
 
-					if (gVoltageMenuCountdown)
+					if (gVoltageMenuCountdown > 0)
 					{
 						if (--gVoltageMenuCountdown == 0)
 						{
diff --git a/app/menu.c b/app/menu.c
index 0422e73..da9706b 100644
--- a/app/menu.c
+++ b/app/menu.c
@@ -1322,5 +1322,5 @@ void MENU_ProcessKeys(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 	}
 
 	if (gScreenToDisplay == DISPLAY_MENU && gMenuCursor == MENU_VOL)
-		gVoltageMenuCountdown = 32;
+		gVoltageMenuCountdown = 2 * 30;   // 30 sec
 }
diff --git a/driver/backlight.c b/driver/backlight.c
index 93b3495..2044a1e 100644
--- a/driver/backlight.c
+++ b/driver/backlight.c
@@ -19,6 +19,7 @@
 #include "driver/gpio.h"
 #include "settings.h"
 
+// this is decremented once every 500ms
 uint8_t gBacklightCountdown = 0;
 
 void BACKLIGHT_TurnOn(void)
@@ -33,16 +34,16 @@ void BACKLIGHT_TurnOn(void)
 	{
 		default:
 		case 1:	// 10 sec
-			gBacklightCountdown = 2 * 10;	// 1
+			gBacklightCountdown = 2 * 10;
 			break;
 		case 2:	// 20 sec
-			gBacklightCountdown = 2 * 20;	// 21
+			gBacklightCountdown = 2 * 20;
 			break;
 		case 3:	// 40 sec
-			gBacklightCountdown = 2 * 40;	// 61
+			gBacklightCountdown = 2 * 40;
 			break;
 		case 4:	// 80 sec
-			gBacklightCountdown = 2 * 80;	// 141
+			gBacklightCountdown = 2 * 80;
 			break;
 		case 5:	// always on
 			gBacklightCountdown = 0;
diff --git a/firmware b/firmware
index eb319db..0f7ebba 100644
Binary files a/firmware and b/firmware differ
diff --git a/firmware.bin b/firmware.bin
index 4c966d2..727ff15 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index 76a835e..975a47d 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ