No COS line in Kenwood TM531

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    Maybe anyone can help me here.
    I try to build an 23cm Repeater with two old Kenwood TM531 TRX and the PI-Repeater-1X board.
    Now i have the problem with the COS line. There is no COS connection possible on the front MIC connector.
    What can i do now?
    Anyone know where i can get this Signal out from the rig?

    Thank you for help!
    73s Klaus, OE4KMU


    Aaron, N3MBH
    Forum Administrator

    I am not familiar with this radio, but if it doesn’t have and external pin for this then you will need to modify the radio to add a control pin/line. Does the radio have an RX LED that you can pull COS from?

    Aaron – N3MBH

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