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Ok just looked at that post not much there but what is interesting is the cable construction and it looks like he was burning his coils in.
Any one know about this?
Any one know about this?
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i see perfect design from the perfectionist. no foil, no epoxy resin, just graphite layer - geotech1ers must learn on that and do not argue with me
that foil is good as shielding. OPEN YOUR EYES AND LEARN THE PICS.Comment
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I know this will hurt, but I always at least try to dare to be stupidOriginally posted by kt315 View Post
Can you please explain why is foil so bad for shielding to teach us something? You always say "its bad", but without explaining "why", its meaningless.
I tried to test this by building classic DD coil on wooden stencil to make both halves as identical as possible. Tested null and detection depth. Of course I got laud noise, because they were unshielded. Often only caused by my hand...
But then I tried thinnest kitchen foil I found and thicker (did not measure) copper tape. On the very same coils. Always was possible to null them down to 2mV (further nulling was impossible due to noise stronger than received signal) and all had exactly the same detection ability. I expected some difference like bigger residual voltage or reduction in detection depth ability, but there was nothing like that.
I really would like to understand differencies between graphite powder, Al and Cu tape, but I can not measure difference anywhere, nor difference in detection ability.
Foil is bad, because?Comment
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You are right KT something definatly to be learned there. the way the shielding is taylored to the coil. that is with the gaps down the middle.
Must not effect shielding and semms would actually increase sensativitv.
Almost looks like a negative image of a fractal antenna.
Ahhh just thinking maybe this helped with the knife like field of the coil.Comment
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Гиена. давай я те чисто по-русски объясню. первая причина потому что вы олухи царя небесного и не видите разницы между ЭЛЕКТРОМАГНИТНЫМИ
полями и ЭЛЕКТРОСТАТИЧЕСКИМИ. ибо физика за 9 класс прошла мимо вас.
так что продолжай использовать фольгу, но не приставай 'why no depth'.Comment
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Pardon?
I do not understnad russian and translator produced only some swearing or what...Comment
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I found that translator is better when translate russian into english. Looks like you forgott to mention second reason.Originally posted by kt315 View Post
So youre explanation why is foil so bad for shielding is because I am king of heaven's boobies. Thank you very much for your explanation, now I understand everything. You are like teachers from my basic school. Those also knew better than me what I know and very often were unable to explain their claims. Then went crazy when I asked again for proper explanation
As I wrote: I get into the very same depth with no shield, with aluminium and copper tapes, no difference at all. I will build big foot for IGSL, in principle its very similar to super D, which I already winded (making shell stencil right now for it). I will use aluminium foil. And I will use epoxy to fix coils in place. How else you want to fix your coils after nulling?
I know its impossible to use aluminium tape (any metalic tape) as shielding for PI coils (and epoxy for fixing windings). But this e-bay big foot seems to be made for Whites DFX, which is VLF.Comment
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Yea noticed the two resonant caps was thinking DFX myself.
By super d do you mean DOD arrangement?
Have one as well but have to revisite it for more testing. Much easier for a PI but I was not impressed with the sensativity to small items with the one I built.
I need to revisit it and properly tune to it.
As far as shielding goes Im no expert but ive seen both foil and the scotch tape recomended in the same manner .
Cutting the foil into a strip like tape then wraping leaving the gap where the lead wire enter. Ive actually wound a coil inside of a copper mesh but i had to compress the windings too tight. But the shielding was or seemed wonderful..Comment
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