diff --git a/app/app.c b/app/app.c
index 0dc60b1..ddbb116 100644
--- a/app/app.c
+++ b/app/app.c
@@ -2124,9 +2124,14 @@ void APP_time_slice_500ms(void)
 
 	#ifdef ENABLE_MDC1200
 		if (mdc1200_rx_ready_tick_500ms > 0)
+		{
 			if (--mdc1200_rx_ready_tick_500ms == 0)
+			{
 				if (g_center_line == CENTER_LINE_MDC1200)
 					g_center_line = CENTER_LINE_NONE;
+				g_update_display = true;
+			}
+		}
 	#endif
 
 	if (g_dtmf_rx_live_timeout > 0)
diff --git a/app/main.c b/app/main.c
index fcd1380..39da944 100644
--- a/app/main.c
+++ b/app/main.c
@@ -135,7 +135,11 @@ void toggle_chan_scanlist(void)
 			// find the first channel that contains this frequency
 			g_tx_vfo->freq_in_channel = BOARD_find_channel(g_tx_vfo->freq_config_tx.frequency);
 
-			g_request_save_vfo = true;
+			SETTINGS_save_channel(g_tx_vfo->channel_save, g_eeprom.tx_vfo, g_tx_vfo, 1);
+
+			#if defined(ENABLE_UART) && defined(ENABLE_UART_DEBUG)
+				UART_printf("chan-vfo %u\r\n", g_tx_vfo->channel_save);
+			#endif
 
 			g_beep_to_play = BEEP_880HZ_60MS_TRIPLE_BEEP;
 			//g_beep_to_play = BEEP_1KHZ_60MS_OPTIONAL;
@@ -150,7 +154,7 @@ void toggle_chan_scanlist(void)
 			// search the channels to see if the frequency is already present
 			unsigned int chan = BOARD_find_channel(g_eeprom.vfo_info[vfo].p_tx->frequency);
 			if (chan > USER_CHANNEL_LAST)
-			{	// find next next free channel
+			{	// not found - find next free channel to save too
 				//for (chan = g_eeprom.screen_channel[vfo]; chan <= USER_CHANNEL_LAST; chan++)
 				for (chan = 0; chan <= USER_CHANNEL_LAST; chan++)
 					if (!RADIO_CheckValidChannel(chan, false, vfo))
@@ -848,7 +852,7 @@ void MAIN_Key_UP_DOWN(bool key_pressed, bool key_held, scan_state_dir_t Directio
 			RADIO_ApplyOffset(g_tx_vfo, true);
 			
 			#if defined(ENABLE_UART) && defined(ENABLE_UART_DEBUG)
-//				UART_printf("save chan\r\n");
+				UART_printf("save chan %u\r\n", g_tx_vfo->channel_save);
 			#endif
 		}
 	}
diff --git a/driver/bk4819.c b/driver/bk4819.c
index e8a20db..18c2e81 100644
--- a/driver/bk4819.c
+++ b/driver/bk4819.c
@@ -2401,7 +2401,7 @@ void BK4819_reset_fsk(void)
 					(0u << 10) |   // 0/1     1 = invert data when RX
 					(0u <<  9) |   // 0/1     1 = invert data when TX
 					(0u <<  8) |   // 0/1     ???
-					(1u <<  4) |   // 0 ~ 15  preamble length
+					(4u <<  4) |   // 0 ~ 15  preamble length
 					(1u <<  3) |   // 0/1     sync length
 					(0u <<  0);    // 0 ~ 7   ???
 
diff --git a/firmware.bin b/firmware.bin
index 88a2daf..7f13be9 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index a091b2f..e7de7a5 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ