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Discussion in 'Radio Circuits, Repair & Performance' started by KC9NGH, Sep 10, 2009.

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  1. KC9NGH

    KC9NGH Ham Member QRZ Page

    I cant find info on this on the net and Ive tried a few different combinations to wire this to my FT-990 which is a standard Yaesu 8 pin. Microphone wire colors are red, black, white, sheild, green
  2. GM0GRD

    GM0GRD Ham Member QRZ Page

  3. W9GB

    W9GB Ham Member QRZ Page

    Get your radio's owner's manual for the pin assignments for the radio's microphone connector!!

    Astatic was one USA manufacturer (Shure, EV, and Turner were the others)
    that tried to stay consistent in the usage/wire color on microphone cabling.

    MIC Audio (+): WHITE
    MIC Audio (GND): SHIELD
    PTT (+): RED sometimes referred to as TX line
    PTT (-): BLACK

    GREEN wire? Likely not needed in your wiring
    RX wire, used in some applications to prevent feedback -- mute speakers

    IF the microphone is a USED purchase from eBay or a hamfest --
    DOUBLE CHECK the wiring (in case of undocumented mods)
    using the continuity function of your VOM/DVM.

    Last edited: Sep 19, 2009
  4. N1JBS

    N1JBS Ham Member QRZ Page

    Pin 8 is mic
    Pin 7 is ground
    Pin 6 is ptt

    Most Astatics are wired as some have already mentioned

    White is usually mic
    shield is ground
    red is usually ptt
    black is sometimes used as a receive wire, but could be the other half of the relay in the mic
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