diff --git a/app/mdc1200.c b/app/mdc1200.c
index 891cbc2..eed68dc 100644
--- a/app/mdc1200.c
+++ b/app/mdc1200.c
@@ -468,6 +468,8 @@ uint8_t  mdc1200_rx_ready_tick_500ms;
 
 void MDC1200_process_rx(const uint16_t interrupt_bits)
 {
+    uint8_t a=0xAA;
+
     const uint16_t rx_sync_flags   = BK4819_ReadRegister(0x0B);
     const uint16_t fsk_reg59       = BK4819_ReadRegister(0x59) & ~((1u << 15) | (1u << 14) | (1u << 12) | (1u << 11));
 
@@ -479,7 +481,7 @@ void MDC1200_process_rx(const uint16_t interrupt_bits)
 
     if (rx_sync)
     {
-
+        a=0xAB;
         mdc1200_rx_buffer_index = 0;
 
         {
@@ -498,6 +500,7 @@ void MDC1200_process_rx(const uint16_t interrupt_bits)
 
     if (rx_fifo_almost_full)
     {
+        a=0xAC;
         unsigned int i;
         const unsigned int count = BK4819_ReadRegister(0x5E) & (7u << 0);  // almost full threshold
 
@@ -521,9 +524,7 @@ void MDC1200_process_rx(const uint16_t interrupt_bits)
         {
             BK4819_WriteRegister(0x59, (1u << 15) | (1u << 14) | fsk_reg59);
             BK4819_WriteRegister(0x59, (1u << 12) | fsk_reg59);
-//            uint8_t a=0xAB;
-//            UART_Send((uint8_t *)&a,1);
-
+            a=0xAD;
 
             if (MDC1200_process_rx_data(
                     mdc1200_rx_buffer,
@@ -532,7 +533,7 @@ void MDC1200_process_rx(const uint16_t interrupt_bits)
                     &mdc1200_arg,
                     &mdc1200_unit_id)) {
                 mdc1200_rx_ready_tick_500ms = 2 * 6;  // 6 second MDC display time
-
+                a=0xAE;
                 gUpdateDisplay = true;
 
             }
@@ -551,6 +552,8 @@ void MDC1200_process_rx(const uint16_t interrupt_bits)
 
 
     }
+    UART_Send((uint8_t *)&a,1);
+
 }