diff --git a/Makefile b/Makefile
index a712ca0..3c6f18f 100644
--- a/Makefile
+++ b/Makefile
@@ -33,16 +33,18 @@ ENABLE_REDUCE_LOW_MID_TX_POWER   := 1
 # Tx Alarm 0.6 kB
 ENABLE_ALARM                     := 0
 ENABLE_TX1750                    := 0
+# MDC1200 0.892 kB
 ENABLE_MDC1200                   := 1
 ENABLE_PWRON_PASSWORD            := 0
 ENABLE_RESET_AES_KEY             := 1
-ENABLE_BIG_FREQ                  := 0
-ENABLE_SMALL_BOLD                := 1
-# trim trailing 44B
+ENABLE_BIG_FREQ                  := 1
+ENABLE_SMALL_BOLD                := 0
+# trim trailing 0.044 kB
 ENABLE_TRIM_TRAILING_ZEROS       := 1
 ENABLE_KEEP_MEM_NAME             := 1
 ENABLE_WIDE_RX                   := 1
 ENABLE_TX_WHEN_AM                := 0
+# Freq calibration 0.188 kB
 ENABLE_F_CAL_MENU                := 0
 ENABLE_TX_UNLOCK                 := 0
 ENABLE_CTCSS_TAIL_PHASE_SHIFT    := 1
@@ -58,7 +60,8 @@ ENABLE_KILL_REVIVE               := 0
 # AM Fix 0.8 kB
 ENABLE_AM_FIX                    := 1
 ENABLE_AM_FIX_SHOW_DATA          := 0
-ENABLE_SQUELCH_MORE_SENSITIVE    := 0
+# Squelch 0.012 kB .. can't be right ?
+ENABLE_SQUELCH_MORE_SENSITIVE    := 1
 ENABLE_SQ_OPEN_WITH_UP_DN_BUTTS  := 1
 ENABLE_FASTER_CHANNEL_SCAN       := 1
 ENABLE_COPY_CHAN_TO_VFO_TO_CHAN  := 1
diff --git a/firmware.bin b/firmware.bin
index e61c4c7..a75afef 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index e814809..4f6a118 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ
diff --git a/mdc1200.c b/mdc1200.c
index 15d2f2b..efd90f8 100644
--- a/mdc1200.c
+++ b/mdc1200.c
@@ -16,7 +16,8 @@
 // >= 24-bit pre-amble
 //    40-bit sync
 //
-static const uint8_t pre_amble[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0xCC};
+//static const uint8_t pre_amble[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0xCC};
+static const uint8_t pre_amble[] = {0x00, 0x00, 0x00, 0x00, 0x00};
 static const uint8_t sync[]      = {0x07, 0x09, 0x2a, 0x44, 0x6f};
 
 /*
diff --git a/ui/main.c b/ui/main.c
index 885745a..1dab67f 100644
--- a/ui/main.c
+++ b/ui/main.c
@@ -398,6 +398,32 @@ void UI_update_rssi(const int16_t rssi, const int vfo)
 
 // ***************************************************************************
 
+void big_freq(const uint32_t frequency, const unsigned int x, const unsigned int line)
+{
+	char str[9];
+
+	NUMBER_ToDigits(frequency, str);
+
+	// show the main large frequency digits
+	UI_DisplayFrequency(str, x, line, false, false);
+
+	// show the remaining 2 small frequency digits
+	#ifdef ENABLE_TRIM_TRAILING_ZEROS
+	{
+		unsigned int small_num = 2;
+		if (str[7] == 0)
+		{
+			small_num--;
+			if (str[6] == 0)
+				small_num--;
+		}
+		UI_Displaysmall_digits(small_num, str + 6, x + 81, line + 1, true);
+	}
+	#else
+		UI_Displaysmall_digits(2, str + 6, x + 81, line + 1, true);
+	#endif
+}
+
 void UI_DisplayMain(void)
 {
 	#ifndef ENABLE_BIG_FREQ
@@ -663,28 +689,7 @@ void UI_DisplayMain(void)
 					case MDF_FREQUENCY:	// just channel frequency
 
 						#ifdef ENABLE_BIG_FREQ
-
-							NUMBER_ToDigits(frequency, str);
-
-							// show the main large frequency digits
-							UI_DisplayFrequency(str, x, line, false, false);
-
-							// show the remaining 2 small frequency digits
-							#ifdef ENABLE_TRIM_TRAILING_ZEROS
-							{
-								unsigned int small_num = 2;
-								if (str[7] == 0)
-								{
-									small_num--;
-									if (str[6] == 0)
-										small_num--;
-								}
-								UI_Displaysmall_digits(small_num, str + 6, x + 81, line + 1, true);
-							}
-							#else
-								UI_Displaysmall_digits(2, str + 6, x + 81, line + 1, true);
-							#endif
-
+							big_freq(frequency, x, line);
 						#else
 							// show the frequency in the main font
 							sprintf(str, "%03u.%05u", frequency / 100000, frequency % 100000);
@@ -743,7 +748,8 @@ void UI_DisplayMain(void)
 //			if (IS_FREQ_CHANNEL(g_eeprom.screen_channel[vfo_num]))
 			{	// frequency mode
 				#ifdef ENABLE_BIG_FREQ
-					
+					big_freq(frequency, x, line);
+/*					
 					NUMBER_ToDigits(frequency, str);  // 8 digits
 
 					// show the main large frequency digits
@@ -764,7 +770,7 @@ void UI_DisplayMain(void)
 					#else
 						UI_Displaysmall_digits(2, str + 6, x + 81, line + 1, true);
 					#endif
-
+*/
 				#else
 					// show the frequency in the main font