Dual Field Pi Coils

[Mrand]

Such coil is well-known for a long time. This isn't the original Whites idea. First was Fisher-Impulse. I also applied such coil of 15 years ago in detectors intended to the usage in the sawmill. The small coil inside doesn't give the general enlargement of the range. She improved characteristic of the answer head for small objects inside coil. The advantage it is visible at coils of 15 inches and more.
Whites had a ready coil case from other detectors (DFX, MXT). It made the new search head. Uses magic words "Dual Field" sells this as the extraordinary novelty. Because people wish novelties, buy this willingly. Amen
Mrand

[WM6]

The small coil inside doesn't give the general enlargement of the range. She improved characteristic of the answer head for small objects inside coil. The advantage it is visible at coils of 15 inches and more.

Exactly! And this can be easy to proven.

[kt315]

An induction balance co-planar coil is also a dual field coil!!!
An anti-interference coil (figure-8, double D) is a dual field coil too!!!

Aziz

Aziz, some folks have made this coil many many years ago, but we did not know then that the coil name is 'dual field'

[WM6]

Aziz, some folks have made this coil many many years ago, but we did not know then that the coil name is 'dual field'

Hi kt315,

impressive Accu!

Regarding term "Dual Field Coil" maybe would be better "Dual Sections Coil"? But if used term is ok for our English coleague it is ok for me too.

[Mrand]

The old coil for Surfmaster was 9.5 inch. New has 12 inches. The new coil MUST be deeper. Similarly is with SEF coils. They are deeper because are greater. If was otherwise, Minelab should stoped coils production, because don't know. Is this the truth? When the mind falls asleep, dodgers awake.
Mrand

[Orbit]

No matter how the coil is called, it is whether it works ,and if it worked better for the mono coil kolko see here is water controversy Who was the first done it would be ,because what is happening that in this great world ,one idea can be born in two or three places simultaneously ,it also happened in the past for some great discoveries .For me it is more realistic practice than theory ,do mono coil, and do a double coil connected in series hook into the unit and see the difference specifically . In theory 2i 2 are 4 but 4 because We take it as a prefix for these numbers on a world scale Science is everywhere the same. But edfor a great scientist Nikola Tesla, it was the same he was leaving the generally accept reasoning electromagnetics reasoning electromagnetics Current science and therefore does not realize all his ideas just because it was for him maybe it was 2i 2 4 for him it may have been another imaginary number.Who understood what I wanted to say they will understand, greeting Orbit.

[Orbit]

but some may not understand What I meant to say for it is the culprit translator,unfortunately I do not know English.

[Aziz]

Aziz, some folks have made this coil many many years ago, but we did not know then that the coil name is 'dual field'

Hi kt315,

good job. A well done craftsmanship.

You could make the coil much bigger. It would go much deeper and it would still be sensitive to small targets.

Aziz

[IBGold]

Hi Aziz and all here is one of my latest 18" Duel-Field coils prior to closing up the housing this is shielded and bonded into the top of the housing.
Regards, Ian.

[Aziz]

Hi Ian,

your coil is looking great. I like it.
Looking forward to see the finished version.

Aziz

[6666]

Thanks all for this very interesting thread

[Sean_Goddard]

Uses magic words "Dual Field" sells this as the extraordinary novelty. Because people wish novelties, buy this willingly. Amen
Mrand

EXACTLY!!

From my experience 90% of detectorists are gullible souls who are sucked in by the latest "pseudo science" which manufacturers continually invent to sell their toys.

You could tell them a new machine has a "spendificating quanglesnarb" on it (or how about "optical target processor" - or LED for short) and they would go out and buy it if they THOUGHT it would give them more finds. BUT.......Speaking from experience, 99% of good finds I have seen have been made by people who "believe" in their machines, and if that made up term inspires confidence, who is to say that machine isn't therefor "better" than the previous model with EXACTLY the SAME electronics but in a new shiny case (Cough...cough..Tesoro...Cough...cough)?

Personally I think a fool and his money are soon parted. That's is my experience from 35 years of detecting and attending rallies!...Glad to see the people on here don't fall into ANY of those categories!

[mikebg]

MORE MODERN NAME!
The "Dual field" name is no more modern!
MULTIFIELD SEARCH COIL or MFXC is the new name of an well known type winding. Each turn of wire creates its own field with different loop diameter.
There is variant with two windings (separate TX and RX) placed in induction balance.
http://www.geotech1.com/forums/showt...eferrerid=2910
The Multifield search coil can be made extremely thin (h=3mm only), which is ideal for underwater movement.
The abbreviation of modern name is MFXC. (XC means that the multifield coil is unknown for the customer :-)

[6666]

Aziz, really nice visualisations!
I was just wondering if its not too much work for you
would you mind showing me what a dual rectangular coil 10inch by 6 inch on the outside
and 5 inch by 3 inch on the inside would look like if its possible please.

thanks
6666

[Dr Vel]

Maybe I breezed past it but I don't see where Carl ever posted the patent. Also is it just my imagination that the idea is possible, or has anyone talked about dual TX, RX coils on two frequencies as being able to give depth information? If so sorry I just cannot carefully read every post on this site in the very large number of pages. The idea just seems to me to be a logical extension of theory.