About the COM1 button

   
         
   

VHF Comm - Icom A200 (Upper unit)

   
         
    Pressing the COM1 button monitors the Com 1 receiver output.    
   

If COM1 MIC is selected, the COM1 button has no additional effect.

   
         
    If COM2 MIC is selected, pressing COM1 simultaneously monitors Comms 1 & 2 and allows transmission on Com 2    
    If COM3 MIC  is selected, pressing COM1 simultaneously monitors Comms 1 & 3 and allows transmission on Com 3