 void loop() {
 
   static unsigned long loop_init = millis();
+  static unsigned long rx_init = millis();
   
   byte mode = Icom706.getMode();
   uint32_t frequency = Icom706.getFrequency();


  switch ( operation_mode ) {
    
    case 0: rxRequestFrequencyAndMode(Icom706, frequency, mode);
            break;

    case 1: rxSetFrequency(Icom706, frequency, mode);  // set right frequency
            break;

    case 2: rxSetMode(Icom706, frequency, mode);  // set right mode
            break;

    default: ;
  }

#if defined (__AVR__)

    }
    
  } // rxSerial.available()

  // display of frequency and mode from time to time
  if ( millis() - loop_init > 2000 ) {
