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Thread: Radio Static From Trim

  1. #1

    Join Date
    Jun 2018
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    Caldwell, ID
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    122

    Question Radio Static From Trim

    Almost every time I adjust the trim on my Kitfox 5, I hear static in my headset. I doesn't happen every time, but most times. Any ideas what could cause this?
    Bartman
    Retired USAF
    Kitfox 5
    N617BR

  2. #2
    Senior Member
    Join Date
    Oct 2016
    Location
    Western Australian
    Posts
    218

    Default Re: Radio Static From Trim

    Assuming you have electric trim it sounds like a ground loop. Are you using the airframe as a ground return for all your services? Try running a separate ground from the trim motor to the battery and see if you still get the same. The only other thing that I can think of would be the trim motor being close to the wires in your headset circuit (not the headset itself but the wires running to the headset plugs) and inducing the static. Does it happen to both headsets at the same time? If it's only one side then it would be a simple matter of routing that headset's wires away from the motor.

  3. #3

    Join Date
    Jun 2009
    Location
    N Little Rock Ar
    Posts
    128

    Default Re: Radio Static From Trim

    tip I got from Garmin ground trim motors as close to the trim motor as you can

    D Kelm 7SS
    Garmin G3X
    912iS Big Bore

  4. #4

    Join Date
    Jun 2018
    Location
    Caldwell, ID
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    122

    Default Re: Radio Static From Trim

    Quote Originally Posted by PaulSS View Post
    Assuming you have electric trim it sounds like a ground loop. Are you using the airframe as a ground return for all your services? Try running a separate ground from the trim motor to the battery and see if you still get the same. The only other thing that I can think of would be the trim motor being close to the wires in your headset circuit (not the headset itself but the wires running to the headset plugs) and inducing the static. Does it happen to both headsets at the same time? If it's only one side then it would be a simple matter of routing that headset's wires away from the motor.
    I am not the builder, so I'm not sure how everything is grounded. It does happen to both headsets at the same time.
    Bartman
    Retired USAF
    Kitfox 5
    N617BR

  5. #5
    Senior Member Esser's Avatar
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    Jul 2011
    Location
    Edmonton, AB
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    2,048

    Default Re: Radio Static From Trim

    Quote Originally Posted by dcsfoto View Post
    tip I got from Garmin ground trim motors as close to the trim motor as you can

    D Kelm 7SS
    Garmin G3X
    912iS Big Bore

    This pretty much goes against all the theory in AeroElectric connection. Everything should go to a common ground to prevent ground loop. My Kit was supplied with 2 wire cable that would reach from the firewall to the tail.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  6. #6
    Senior Member efwd's Avatar
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    Jun 2015
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    Yorba Linda, CA
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    2,817

    Default Re: Radio Static From Trim

    Yeh, that's opposite of what I have read and therefore did in my build. Haven't really tested the audio yet. Crossing my fingers.
    Eddie Forward
    Flying
    SS7, 912iS, Garmin G3X

  7. #7
    Senior Member
    Join Date
    Jul 2011
    Location
    milwaukee wi
    Posts
    490

    Default Re: Radio Static From Trim

    At his seminar, Bob Nuckols said to have an avionics ground and an electrical system ground and at some point, connect the two grounds.

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