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Your are a genius Skippy. 
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Here's some mathematics for you.
You measured inductances as: RX = 14.9 mH; TX = 10.4 mH. Ratio = 1.433, so the Turns ratio = Square-root(1.433) = 1.197
Your coil cross-sections show: RX = 155 Turns; TX = 129 Turns. Ratio = 155/129 = 1.201.
Pretty darn close. This also shows that if there are any 'extra' windings, for mysterious purposes, like broadband nulling, they can't be more than maybe 1 or 2 turns.Comment
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Skippy it was 15.9 the RX and yes the TX 10.4 - how does that effect you mathematic ?
EDIT THIS POST - Can't Remember my own work... Sorry 14.9 mH you where right. SORRY.
Finish paint and bottom seal. (Pictures)Comment
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dons shells are exellent, nice job it seems from skippys pics xp are not worried about interwire capacitanceComment
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The first scratches came to day, at my newly painted 7" coil.. Need to make cover or protection. But 2 hours search and 4 old hammered coins.. Its working pretty good amongst a lot of iron.
Thanks for all you help to make this coil.
HenrikComment
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Show us a pic of your hammereds !! SteveComment
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if you found them in the same field, they would be considered as a hoard in the uk.Comment
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Yes, we want to see those hammered coins.
So, have you had enough experience to know that you got the coil size right? Do you think a smaller one would have been better? I ask because I kept trying to persuade you to 'think small', knowing how good the 5 inch DD is on the Fisher F75 / Tek T2.
I've been thinking a bit more about shielding, about the conductive plastic, about the conductive filler resin. etc. When you have the time, it would be informative if you could analyse the original coils construction. I think the outer case resistance is best measured using a long strip shape. Such as a 10mm x 50mm x (?mm thickness), measure it end-to-end. As for the filler, I guess it will be hard to cut to a precise shape. Could you make a 10mm cube, and measure Resistance from the centre of one face to the centre of the opposite face?
With these figures, it might help recreate what XP have done.
I'll post up more later.Comment
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7" coil covers coming your way..Originally posted by Henrikras View PostThe first scratches came to day, at my newly painted 7" coil.. Need to make cover or protection. But 2 hours search and 4 old hammered coins.. Its working pretty good amongst a lot of iron.
Thanks for all you help to make this coil.
Henrik
DonComment
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Hi all.
Here is some pictures.. Pics 1+ 2 is the coil after 2 hours search. I will record a video next time I go out to the hot spot,
so you can see all the stones and briks there is at the surface.
Pics. 3-4-5 is the finds until know... That spot here was the reason to make a 7" (smaller) in a hurry.. Ive started out there 1-2 months ago, and it allmust impossible to do the search, there is so many nails and iron things. Ive found out that a faster Detector and smaller coils did a better job... More finds days with slow slow swing and in fast programs. But even with the 9" Deus coil and in the fast prg. I could see that the nails was masking.
It will properly Be a kind of a hoard - but the reason so many coins are found in the same place (and there is found many more since 1996 the spot was found), is that all the farmers had to pay the King at this place. Is was a kind of a casstle in the year 12-1500, then is was more like a Big farm.
Must of the coins is form a period 12-1440 where there where a lot of wars / fights here in DK.. We call them civil war coins.. They are with Very low % silver because the King needed money to participate in the wars.
But there is silver coins out there, not many and mustly broken.
Picture 7 is some of the iron stuf I dig up... Ist a good idea to dig those Big iron signal, there is easy to find..
Skippy I will do some measuring this evening.
Take care good Friends.
Henrik.Comment
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This is still my favourite thread of 2014. Henrikras has taken an idea from conception through to a successful conclusion ( with lots of technical advice and help from some others ), and has added utility to his Deus. He persevered and came out with his desired coil. And it is shared here, thanks to Geotech.
If there was a monthly Geotech prize, I would be voting for Henrikras to receive it. And I would be willing to paypal a small contribution ( to Carl or George ), so that they could maybe send him a goody bag of resin or winding wire etc. Maybe I'm going to far, but its just a thought.Comment
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i think thats a good idea, top man.Comment
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Thanks - but please think about this in some another way.
Competition isn't allways a good idea, but I'm Glad that some usefull came out in the open. This like many other threads is something we share and doing together in the spirit of this hobby, and the spirit is so great in this Forum. Lets keep it there and go back to the subject please.
Henrik.Comment
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Hello Henrick.Originally posted by Henrikras View PostThanks - but please think about this in some another way.
Competition isn't allways a good idea, but I'm Glad that some usefull came out in the open. This like many other threads is something we share and doing together in the spirit of this hobby, and the spirit is so great in this Forum. Lets keep it there and go back to the subject please.
Henrik.
With that said, I will be happy to "donate". I will be dropping these in the mail today. These are still in the experimental stage so don't get hopes too high.
They fit like a glove on some shells that I just made but once a shell is epoxy filled you may need to make a tiny "shoe horn"to get them on.
Anyway, see what you can do and I may need to make another go around if they need to be larger.
DonComment
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