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Thread: interference questions and advice

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    Senior Member 1idejim's Avatar
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    Default interference questions and advice

    hi guys, been awhile.

    i need some input and advice on the matter of interference.

    i'm using a 1748kh locator for irrigation valve and wire locating, i very seldom have issues that i can't work through but i get asked often about interference from power sources.

    i can talk bleeds and faults through without problems but i could use some input on high freq. locates in congested areas around transformers and close proximity to parallel paths.

    an extended earth ground helps but i could use a tip or two.

    thanks
    You Can't Fix It Till You Find It - Jim 3:23

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    Senior Member ProfessionalLocator's Avatar
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    Default Re: interference questions and advice

    I find a spot not too far away and induce from there in order to refine the marks where there is a lot of bleed off. But I set the box off the mark, not directly over the utility and on the side of the mark that does not have the offending utility. This way I induce a signal strong enough to read but too weak to bleed off.

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    Senior Member headcipher's Avatar
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    Default Re: interference questions and advice

    1748 khz? That is an extremely high frequency that will bleed off on a lot of different utilities especially in a congested area. Now if you mean 1.748khz, that would be a quite good locate freq. for congested areas. For the most part, the electric will be deeper and less likely to be bled off on from a irrigation line, I have the opposite problem at times. Induction from a confirmed isolated point or as ProLoc describes works well. Or if there is a problem, locate the electric by connecting to the transformer/vault/meter to eliminate the confusion as to what facility you are on. The only time I find a problem around vaults is when another facility grounds to my vault.

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    Senior Member 1idejim's Avatar
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    Default Re: interference questions and advice

    both the armada and the greenlee use 1,748 khz. i believe that the reasn is that the signal distorts at the solenoid for locating purposes when using a closed loop.
    You Can't Fix It Till You Find It - Jim 3:23

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    Senior Member [HAF]Foxtrot's Avatar
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    Default Re: interference questions and advice

    Wow that is a huge signal. If you mean 1,748 and not 1.748. Your probably bleeding on lines in China.

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    Senior Member 1idejim's Avatar
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    Default Re: interference questions and advice

    Quote Originally Posted by [HAF]Foxtrot View Post
    Wow that is a huge signal. If you mean 1,748 and not 1.748. Your probably bleeding on lines in China.
    one million seven hundred forty eight thousand, it's controllable most of the time.
    You Can't Fix It Till You Find It - Jim 3:23

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