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"Hum" on input from radio to mixer

Discussion in 'Ham Equipment' started by N0WY, Mar 19, 2012.

  1. N0WY

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    Aug 11, 2010
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    Hey all,

    I have waded into the land of dedicated audio equipment for my amateur radio equipment and am amazed by the reports I am receiving from others.

    I do have one problem I have yet to work out and was wondering if anyone had any ideas...but first let me explain what I have setup, as I am sure that would be the first question asked of me.

    Yaesu FT-857
    LDG YT-100 Tuner
    Behringer 1622FX USB Mixer
    iPlus by W2IHY
    Heil PR-781
    Yaesu FP-1030a Power Supply

    I am thinking the issue is that I do not have the power supply, tuner or radio grounded and I have heard that that could cause a hum. My issue is that I am in a 2nd story "office" in my house and running a ground that long would just turn it into another antenna.

    So I am wondering what I can do to work on getting rid of the "hum".

    Thanks so much,

  2. Moleculo

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    Staff Member

    Apr 14, 2002
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    I had a mean ground hum in my audio chain introduced by a Heil mic cable. In my case it was causing a ground loop. To solve the problem, I disconnected either the shield or ground wire from the rig side of the cable (I forgot which wire I removed but I remember it being obvious when I looked at the wiring diagram). The other thing to check is that all of the audio equipment is grounded to a common ground bus. Concentrate on the audio chain and you'll probably find the problem.

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