First thoughts and review of the new XP Deus elliptical coil.

[Tedyoh]

I hear ya and I hear what VF is saying, or whoever wrote what he's relaying....my pea sized brain is telling me it should separate better, be it .5 or 1".and that's all that really matters in my world I suppose.

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[vferrari]

1. Electromagnetic fields are defined by fairly complex mathematics, actually. The size of the coil area of the DD determines the depth of the coil but not appreciably the narrow width of the active region.

2. XP only makes DD coils for the Deus, so , um, yes I know the HF coils are DD. That is why my whole discussion is about DD coils and the narrow side-to-side detection field which I attempted to illustrate (albeit poorly). Same is not true for coaxial coils where the elliptical shape does narrow the width of the field, increasing separation.

3. If you are actually interested in what a DD coil field looks like and have Andy Sabisch's Deus Handbook, he goes through a brief tutorial of the DD coil field. He doesn't describe the difference between a circular and elliptical DD but describes the difference between a DD and a coaxial coil. And as I said before, a google search will turn up several similar illustrations.

 

[Tedyoh]

Ok this is the point I was trying to make, and I'll post a video when I get time....take a nail and put a dime an inch away from it...Deus picks it up no problem....Ok ....now put another nail, say 4 inches away from the dime...so now you have dime and nail close and another nail 4" away....if the east/west edge of the coil hits the nail that's 4" away from the other nail and dime, that's under the center of the coil, you will lose your high tone.

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[vferrari]

Tedyoh, agree the difference in side-to-side separation improvement may only be fraction of an inch whereas on a coaxial coil the difference in separation between an elliptical and circular may be a few inches. That was my point.

Deft Tones, I think you are correct in the coil field description details. I am talking about the already narrow V field only getting slightly narrower. Never heard that thumbrule on ellipticàl coil depth capability. Interesting...

 

[vferrari]

Ok this is the point I was trying to make, and I'll post a video when I get time....take a nail and put a dime an inch away from it...Deus picks it up no problem....Ok ....now put another nail, say 4 inches away from the dime...so now you have dime and nail close and another nail 4" away....if the east/west edge of the coil hits the nail that's 4" away from the other nail and dime, that's under the center of the coil, you will lose your high tone.

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Interesting. That may be an effect related to distorting the DD cancellation field and in that case, the elliptical would help because it might avoid the far nail.

 

[Calabash Digger]

Mine will be here tommorrow will do some test with it.

 

[laidback4sho]

Mine will be here tommorrow will do some test with it.

Let us know what you find out, please. Thinking of sending mine back in the morning for a replacement. It's bad when your MI-6 pinpointer gets almost the same depth as your coil.

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[vferrari]

Yeah. I hope its a hardware problem/defect. Although a hassle to deal with better than a defective or underperforming design. Need some more real world data from folks like Calabash.

 

[Tedyoh]

I'm no Clabash but I just got my coil charged up, air test, R2, S2, 14 khz, hitting penny at 8" silver dime 8", nickel 10", large cent 10"....ill mess with gold later.

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[austin_luker]

What about the higher frequencys?

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[austin_luker]

Would love if it was just a defective coil, I feel bad for laidback but there might be some hope at the end of the rainbow

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[Tedyoh]

What about the higher frequencys?

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28.8 kHz
LC 9"
Penny 9"
Buffalo 11.5"
Silver dime (canadian) 9"

74 kHz
LC 8"
Penny 7"
Buffalo 11.5 -12"
Silver dime 7"


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[laidback4sho]

I'm no Clabash but I just got my coil charged up, air test, R2, S2, 14 khz, hitting penny at 8" silver dime 8", nickel 10", large cent 10"....ill mess with gold later.

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Yeah, that's way more than I'm getting... Almost guarantee I got a bad coil.

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[Tedyoh]

Sounds like it unfortunately....im sure XP will make it right for you.

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[vferrari]

I prefer to wait to see what Calabash says...just kidding. That's good news, Tedyoh. When you get a chance see if the separation is improved vs. the round 9" legacy or HF.

 

[Gone Detectin]

28.8 kHz
LC 9"
Penny 9"
Buffalo 11.5"
Silver dime (canadian) 9"

74 kHz
LC 8"
Penny 7"
Buffalo 11.5 -12"
Silver dime 7"


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This is good news thanks for the tests.

Anyone up for a monte nail board test?

I cant wait to try this at a site where the EMI is killer.

 

[vferrari]

Notice how that mid-conductor nickel depth went UP with frequency while all the high conductors went down - just as you would expect for HF. Bodes well for gold and relic brass/small lead. Cool.

 

[Tedyoh]

I prefer to wait to see what Calabash says...just kidding. That's good news, Tedyoh. When you get a chance see if the separation is improved vs. the round 9" legacy or HF.

His test garden is much more in depth than mine so I as well am looking forward to his results! Thunderstorms today so I will try to mess around with separation tomorrow.
I did do 2 more air tests....kinda surprised by the results

14 kHz
1856 $2.5 gold dollar (love token actually, size of a dime)
9" solid VDI 64
.54 cal Minnie ball 9"

28.8 kHz
Gold coin 10" (solid 77 VDI)
.54 Minnie ball 10"

74 kHz
Gold coin 9" (solid VDI 88) I though the coin would read deeper?
.54 Minnie ball 10.5"

Looks like best depth for gold coins anyway is in 28.8 kHz

 

[Calabash Digger]

Tedyoh thanks for posting that ive been sitting here biting my nails.

 

[Calabash Digger]

Notice how that mid-conductor nickel depth went UP with frequency while all the high conductors went down - just as you would expect for HF. Bodes well for gold and relic brass/small lead. Cool.

wonder how much edge that will give me with pewter buttons?