WHITES DUAL FIELD COIL

[Dave J.]

That' s funny, it reads right on top of the Impulse from the early 1990's. I don't think Dan Geyer would have intentionally ripped Kenny off, so I'm supposing that Dan simply didn't know what the Impulse was.

--Dave J.

[daverave]

Patent? The Fisher Impulse used a damping resistor across the inner coil.

I was unaware of the White's patent. Got a number?

I'm (almost) more interested in who claimed to have invented it for White's. White's has been ripped off by engineers in the past. White's may be a competitor now, but they are for me personally a former employer and are now a respected competitor, a company with whom we have friendly relations.

No need to PM me, please post the patent number here. This is Carl's forum, and he's White's chief engineer whom I don't believe had anything to do with this. For White's sake, I hope none of the old saboteur gang are still unreformed on the payroll. Let the chips fall where they may..........

--Dave J.

why so serious Dave J. we are all mainly experimenters on this forum...the dual field coil is no big deal....in fact im better off using my single coil 15 x12 as i get just as good proformance...i think in industry manufacturers just bring out some new innovation to compete with competitors...i really believe now that the whites dual field detector has been improved more by increased amplification than by this dual field coil...we are all learning on here...we are not in busin ess to make from what we do....so pls just chill out !!!!

[Aziz]

Why don't you guys use seperate large TX and a small RX coil (concentric co-planar configuration)?
It outperforms a dual field coil. It is also reducing ground noise. And you can use much larger TX coils (getting more detection depth). You pick up less EMI noise in the RX coil too.

Have a look at the coil comparison Excel file somewhere here in the forum. That's a rocket science and for free! No one has done such a coil analysis yet.

Aziz

[6666]

not required

[kt315]

Aziz, there are:
- single layer coil
-single layer Tesla coil
- basket coil in another variations
too much to learn by Daverave... the world does not end by only dual field, what really not dual field but splitted coil in 2 part. every can split a coil in 3...4...5... xxxx parts.
and so go out to one layer winding. Gary Chamelec had researched them many years ago and discribed on his site. but some people are blind, they needs to rediscovery a bicycle and America continent for themself.

[Davor]

No guys, Aziz proposes a completely different thing. If Rx coil is physically separated from a Tx coil it picks far less ground noise, and it is somewhat different from balanced VLF designs.

[daverave]

with respect to the other guys on here i think kt315 is right in his thinking about coils...pulse detectors have survived for many years with only one coil...from what i can see eric fosters detectors were all mainly one coil and he is the leading expert on pulse technology so if dual field is so fantastic then why did not eric foster develop such a coil many years ago....as i said before i think its all about business and we all seem to fall into that trap of thinking that this latest innovation is the bee's knee's when in fact it may only make a little difference and costing mega bucks.

[Aziz]

Davor, you are understanding me!
But the other guys...
Aziz

[kt315]

other guys are not so idiotics botanists with big lens at nose you present of. a monocoil is huge advantage of PI because very simple in the realization. I do not see deep sense to make PI coil like VLF coil. either it will be balanced or not balanced. if you need VLF coil so do VLF design and do not dramatically hysterics here on mithycal ground noise. PI works and works very fine at any soil. if your PI does not work it is only your problem, not of all geotechers.

[Aziz]

Well, I can not force you to use it. It's up to you to recognize the benefits of such a design.

But I'm almost ready for the mental hospital...

(That would be the sixth times this time... )
Aziz,
the madman

[bernte_one]

a separated tx/ rx combination makes sense for a pi
somes commercial designs use this for best sens to small objects

not the easiest type to build but also not complicated

[6666]

Aziz
do you remember any details from your XL sheet ?

[daverave]

i think i will just stick to mono coils....cant really see the point of dual field when i can get the same proformance from my single mono coil....im not that impressed with dual field....i think better wire and lower noise levels and amplification is the way forward for a deep pi detector.

[Aziz]

Aziz
do you remember any details from your XL sheet ?

Do you understand the XL sheet content?

[daverave]

lm confused im not sure what XL ?????