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Descriptions can be confusing. confused smiley

October 24, 2022 12:57PM avatar
A lot has to do with marketing, and some has to do with people who state something or put it in print in a book or magazine (for those of us who remember those good old days of magazines), and naturally in brochures or other printed forms to include on the Internet. Sometimes things were incorrectly described by a manufacturer owner or other 'important person' and handed to a secretary to type out for a manual. The manuals used to, and still do, have some incorrect info because the write and the typer didn't know correct from incorrect. Today, if we have more design engineers involved in manuals and marketing we see improved information to not lead us astray.

Examples might be Minelab's nutty comments and pictures of their BBS units calling them 17 Frequency and the FBS models at 28 Frequencies, an showing all sorts of arrows pointing down from the coils. So many people believed they worked at all those frequencies, and not two, and that they generated a signal, or EMF, projected straight down from tip-to-tail. Wrong, wrong, wrong.


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jmaryt
apparently all the the info I have gleaned about this over the years is incorrect!

No, not ALL the information, but we have all been subjected to wrong information and we just need to learn and understand some of these things.

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jmaryt
results would be inconclusive in freshly disturbed soil. would be of little consequence

Depends on what 'results' you are referring to. Target response and detection depth can vary between undisturbed ground and disturbed ground if the same coin-type target is positioned at the same depth and orientation. There have been times i have found a coin deeper in both hard-packed and undisturbed ground or in loose, plowed ground than it tested after recovery doing an 'air test'. A lot of variable involved we have no control over, and plenty that we do. Detector circuitry design, search coil size and type, and using very functional settings or not having things set up right all makes a difference. Also, since you're referring to 'ground', it is important to have a good working Ground Balance when possible Remember, some makes and models are 'fixed', some are 'fixed' wrong, and some have no user control over a particular mode's GB.


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jmaryt
I have recovered coins down about 8" or so with the Mojave, but I believe I would have missed them if I did not overlap sweeps by 50%
I'm just sayin'

Certainly, any overlapping is better than no overlapping, and an a coin can be missed at that depth without a good overlap or else the detector (EMF detection field) won't 'see' t.

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jmaryt
in addendum: air tests can never be positively relied upon as the soil matrix is missing!

Sometimes, you are correct. But as UtahRich responded below, you can 'test' or learn what a nice-and-proper Electro-Magnetic Field might appear like under ideal, 'in-the-air' conditions. Ground mineralization and the influence of nearby masking trash can 'warp' the field to a degree and that can alter some results. The particular shape and orientation of a target can, as well, as it also warps or influences the 'shape' of the EMF.

In the end the side-view of the functional portion of the EMF is wider near the coil and much smaller at the farthest point from the coil, so the shape might appear 'cone' like or more of a bowl-shape, but still the strongest at a much smaller point or area the farthest from the coil.

Monte

"Your EYES ... the only 100% accurate form of Discrimination!"

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Metal Detector Evaluations and Product Reviews
I'm now 'back home' in Farr West Utah
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Subject Author Views Posted

When is it beneficial to Overlap Coil Sweeps?

UtahRich 330 October 20, 2022 11:38AM

How do you walk in a straight line?

GB_Amateur 201 October 22, 2022 10:15AM

GB_Amateur, your addition to this topic fits well.

Monte 187 October 22, 2022 02:18PM

Thanks, Monte

GB_Amateur 233 October 23, 2022 09:57AM

Great questions, Rich. thinkingconfused smiley

Monte 509 October 21, 2022 01:33PM

Re: When is it less productive to overlap coin sweeps?

Sodbuster 186 October 21, 2022 09:36AM

Re: When is it beneficial to Overlap Coil Sweeps?

jmaryt 465 October 20, 2022 06:10PM

j.t., just a brief comment about a 'detection field'.

Monte 171 October 21, 2022 12:21PM

Re: j.t., just a brief comment about a 'detection field'.

jmaryt 204 October 21, 2022 07:02PM

j.t., I agree about the 50% overlap coverage.

Monte 178 October 22, 2022 04:45AM

Re: j.t., I agree about the 50% overlap coverage.

jmaryt 182 October 22, 2022 07:54PM

hmmm . . . . .

UtahRich 194 October 21, 2022 08:41PM

Re: hmmm . . . . .

jmaryt 199 October 22, 2022 08:01PM

It looks like what?

UtahRich 229 October 22, 2022 09:46PM

Re: It looks like what?

Geotech 206 October 27, 2022 12:00PM

Re: It looks like what?

GB_Amateur 177 October 28, 2022 09:52AM

Re: It looks like what?

Geotech 169 October 29, 2022 01:54PM

Re: It looks like what?

GB_Amateur 190 October 30, 2022 09:38AM

Experimenting with your own equipment

UtahRich 192 October 28, 2022 10:42AM

Re: Experimenting with your own equipment

nwdetectorist 171 October 31, 2022 08:49PM

Rich, there is another way to deal with cell phone EMI.

Monte 208 October 29, 2022 10:43AM

Re: Rich, there is another way to deal with cell phone EMI.

jmaryt 165 October 29, 2022 07:20PM

Re: Experimenting with your own equipment

GB_Amateur 176 October 29, 2022 09:46AM

Re: Experimenting with your own equipment

Monte 189 October 29, 2022 10:52AM

Great response.

UtahRich 202 October 27, 2022 04:12PM

Re: It looks like what?

FeistyFrank 186 October 27, 2022 02:44PM

Re: It looks like what?

Geotech 187 October 28, 2022 10:15AM

Thank You, Carl.. Appreciated by many. N/T

Monte 146 October 29, 2022 10:54AM

Re: It looks like what?

FeistyFrank 170 October 28, 2022 11:10AM

Re: It looks like what?

jmaryt 173 October 23, 2022 07:52PM

Descriptions can be confusing. confused smiley

Monte 182 October 24, 2022 12:57PM

Re: Descriptions can be confusing. confused smiley

jmaryt 186 October 24, 2022 06:03PM

j.t., as UtahRich said ... No worries.

Monte 227 October 25, 2022 05:21AM

Re: j.t., as UtahRich said ... No worries.

jmaryt 272 October 25, 2022 05:07PM

Re: Descriptions can be confusing. confused smiley

UtahRich 189 October 24, 2022 07:54PM

Re: Descriptions can be confusing. confused smiley

jmaryt 194 October 25, 2022 05:13PM

Sunrise . . . . sunset . . . .

UtahRich 185 October 26, 2022 01:12AM

Re: Sunrise . . . . sunset . . . .

jmaryt 170 October 26, 2022 06:20PM

Or is that Snow Fal .... Snow Melt ....

Monte 168 October 26, 2022 01:29PM

A better description?

UtahRich 189 October 23, 2022 09:05PM

Rich, I am looking for Carl's post. N/T

Monte 195 October 23, 2022 07:09PM

Yes, the topic can create some interesting discussions.

Monte 190 October 22, 2022 02:35PM



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