Hello J_Player: I not use much the AL718, but something not work in G.G.707 the ferrite rod when come here from CA, read:
http://www.geotech1.com/forums/showt...urate+locators
Next in 2002 I went to old hacienda:inmigrants from Ireland, Jorge B. son of Thomas Braniff, rich man about 1900 in Mexico.
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I went to the area:
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and there I receive fantastic null, in a deep hole in a river, I triangulate the null,,, the other thing, later the amplifier generate more strong sound in amplifier:
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when I discover broken the ferrite rod I send to Accurate L. for repair, next I receive the G.G. with new ferrite rod:
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but G.G. not receive that null in a deep hole,,,Now this old man -1926 say: the last people in hacienda put around in the deep hole very large amount of metal for strengthen the hole.
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for end. What is the reason G.G. boost signals when rod was broken?
also the Al718 not receiver null from deep river.
I think when G.G. broken work to more freq. may be 50-100 khz and detect big metal objets underground. What is you opinion