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Thread: What determines the depth when making a detector

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  1. #31
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    us
    May 2010
    White Plains, New York
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    Quote Originally Posted by crashbandicoot View Post
    With the exception of Terry,s comment here,this is still an unproductive line of argument,FCC limitation on power is not the same as a company deliberately capping the depth a detector will reach.As I understand it the reason for different coils is to achieve a particular result,as in the bigger the coil,more depth,more coverage per swing,a smaller coil gives better separation in trashy places and is easier to use in close quarters,no conspiracy there.But I like an argument as well as anybody,so have at it!
    Think of your metal detector, operating at the frequency of your choice, as a manually dial-tuned radio. It transmits, and it receives, however to achieve both to its highest capabilities sending and receiving must be correctly "tuned" to defeat static from ground noise, magnetic anomalies, and minerals. The maximum power it can it can transmit is 96.4 of maximum power available, or about 5-watts.

    This is where tuning your machine - by internal computer circuitry, and/or manually, fits into the equation hard. There is always static with a Very Low Frequency device. Analog tuning, and training your ears to hear SLIGHT breaks and WHISPERS is key to depth.
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  2. #32
    us
    Sep 2013
    Scituate, RI
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    Coil size has a lot to do with how deep a detector can go. I bought a sniper coil for my AT Pro to pick out the good stuff in iron infested cellar holes. Worked pretty good, but the maximum depth was probably 5" or so and it didn't cover ground very fast in the woods. My 8 1/2"x11" coil can detect a dime up to 10" down and it covers a lot of ground. I felt like the sniper coil was missing a little too much and slowing me down, so I eventually sold it.

    But as I've stated before, the vast majority of coins are less than 8" down, so all this worrying about how deep your detector goes is wasted time.
    crashbandicoot likes this.

  3. #33
    br
    Jul 2018
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    okay...I can help on this (well perhaps)

    basically, the detector sends out a signal at a frequency, (or perhaps several frequencies) .
    The signal reflects, and the detector reads the reflection of the signal...

    There are a few things at play here...(not in order of importance)
    Signal frequency
    Signal strength
    Length of signal
    Strength of the return
    and of course, the speed of sound.

    all of these factors (and more) are what a detector does, and balances depending on the myriad of things programmed in to the detector.

    Lets say, for the topic at hand, depth. Depth is a function of several variables, but in my analysis signal length and frequency are the most able to expand or limit depth.

    Balancing depth is difficult....you want deep, shallow, all? Signal length will get you deeper, but, if a target is shallow, the signal will be reflecting back to the detector before the signal is finished broadcasting. You can optimized this by adjusting the frequency (due to the speed of sound length of time),
    buuuut...depending on the density of the matrix material...
    Now the return signal is measuring the background reflection and the strength of the return signal....things being equal, a denser material will have a stronger return signal...

    You balance your detector, given that all of this is relative, to minimize the matrix material, and show the relatively denser materials...

    I hope that you can see why the balance between depth, frequency, and signal strength are important...

    I could make this post last for days!

    Suffice to say....keep in mind all of these factors...
    crashbandicoot and ScoTTT2 like this.
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