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Thread: RF Interference

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    Barnacle Bill is offline Super Mod and 2014 Crappie.com Man of the Year * Crappie.com Supporter
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    Default RF Interference

    It has been requested that we have a sticky just for RF type interference with electronics. So this is the place to post your problems and cures for such type problems.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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    Good idea Bill...

    Let me get the links to these in here right at the first..

    Trolling Motor Induced Sonar Interference



    http://notjustfishing.com/MotoGuide.pdf





    www.podunkideas.com <--Click here
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    ------------------------>> Pro Staff Sonar Advisor

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    Quote Originally Posted by rnvinc View Post
    Good idea Bill...

    Let me get the links to these in here right at the first..

    Trolling Motor Induced Sonar Interference



    http://notjustfishing.com/MotoGuide.pdf

    This was Canepole's and DonG's idea. I think It could turn into something good.



    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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    Here are a couple more references from Humminbird.
    Humminbird: America


    Humminbird: America





    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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    Vexilar Tips and Articles



    Member BS Pro-Staff and Billbob Pro-Staff
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    Call these folks about your ferrite core needs for RFI. They are the toroidal donut experts.


    Toroid cores for amateur radio



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    Default Pictures

    RF interference after initial set-up. This noise was on SI & DI(455 & 800) with no noise on 2D.TD is mounted on TM

    Name:  HB TM Noise 001.jpg
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    After re-routing my TD cable the noise still remained on 800kHZ but was clear on 455kHZ.

    After installing the TMC-1 this is what I now have. Clear on 455 and very little on 800..I will live with this until I visit Tom..
    I have no idea what the white horizontal line is on the DI..It shows up when I select 800kHz even with the TM unplugged.
    Name:  More RF 002.jpg
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    USS Intrepid CVS-11 Helicopter Squadron-3 1960-1964



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    I have been working on my TM, so I thought I would make this short video so someone might relate to what is going on with pwm as related to noise and speed of the TM.
    You will see the noise spikes near the end of the video. I did some rough calculations of the noise frequencies present. The noise ranged between 1 megahertz down to 100 kilohertz. These noise frequencies fall in the band of the sonar transducer frequencies. (RF). That is why you see it on the screen. This is just a show and tell and does not cover all the noise sources of RF.



    Hope it make sense to someone.






    Wanted to add that the fundamental frequency of this PWM is 20Hz. So, what you see is a 20Hz modified square wave. When you run wide open, the bottom line goes straight, meaning a solid ground is supplied through the FET to the negative side brush of the motor so there would be no pulses, therefore no noise at WOT (kinda). The reason the pulse fundamental frequency is so low (20 Hz) is because at higher pulsed frequencies, you can actually hear the motor squeal like a pig. When you hear that "click" everytime you hit the foot switch, well, that is a 50 amp relay operating which places 12/24v to the positive motor brush. This is a coasting relay which prevents regenerative braking. In other words, the motor coasts to a stop instead of stopping suddenly. Electric choo choo trains use regenerative braking to slow down. Disc brakes don't work too good on choo choos.

    Last edited by Cane Pole; 01-09-2012 at 10:24 PM.
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    Quote Originally Posted by rnvinc View Post
    Good idea Bill...

    Let me get the links to these in here right at the first..

    Trolling Motor Induced Sonar Interference



    http://notjustfishing.com/MotoGuide.pdf

    Where would you be able to find an RF Choke describe in the article by Motorguide?
    Thanks




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    Quote Originally Posted by crappiemax View Post
    Where would you be able to find an RF Choke describe in the article by Motorguide?
    Thanks
    That is just a ferrite core. You can get them at Radio Shack.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va


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