About the COM3 MIC button


40 channel UHF FM Transceiver

    Pressing the COM3 MIC button selects the Com 3 transmitter and receiver.    

Check that the DU button on the front of Com 3 is OUT

    When COM3 MIC is selected, pressing COM1 and COM2 simultaneously monitors Comms 1 & 2 but transmission is only on Com 3    
    The COM3 MIC indicator light blinks while the Com 3 transmitter is keyed on    
    Include these indicators in your panel scan to detect inadvertent transmitter activation