3khz or 7.5 for Coins?
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Thread: 3khz or 7.5 for Coins?

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  1. #1
    us
    Dave

    Oct 2018
    Coffeyville, KS
    Minelab XTerra 705 Fisher F44
    74
    70 times
    Prospecting

    3khz or 7.5 for Coins?

    I am considering getting an additional coil for my XT705 Gold. It currently has the 5x10 18.75 khz coil. I seem to understand that lower frequencies are best for high conductors (silver/copper), and less sensitive to ferrous. I have a Fisher machine that operates at 7.8, so I was thinking getting a 3 khz coil for the 705 would cover all my bases...

    Any experience out there using the 705 at this freq? Recommendations?
    "A pipe gives a wise man time to think, and a fool something to put in his mouth." - e. e. cummings

  2. #2
    Charter Member
    us
    Oct 2014
    Massachusetts
    Garrett: AT Pro, AT Gold & Infinium; Minelab: Explorer SE, II & X-terra 705; Tesoro: Tejon & Outlaw; White's: V3i & DFX
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    The 3K Hz coil is fairly deep and hits hard on higher conductors. I like the 18K Hz for jewelry in parks and play areas.

 

 

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