15*15 sheet of copper in 2m depth !! possible??

[Bhathu saaii]

hi

i have attened to your perfect forum recently .
its about 2 monthes that iam working on metal detectors . i have build deltapulse2 .

Hello payam..are you still here?

[mohandes]

Here's something new and interesting...
https://www.youtube.com/watch?v=-5k6q1C4L64

very nice video.ground balance is perfect.
thankks

[Funfinder]

Here's something new and interesting...
https://www.youtube.com/watch?v=-5k6q1C4L64

Tests like shown in this clip have already some substance but
the ground there is totally flat, the guys above are not walking with the
coil and - as seen at the end of the movie -
even a slight movement of the 1m coil holding person
already causes almost the same signal as the metal plate below.

Imagine yourself walking over the site including that
everywhere you go occure very hard to distinct signals
and you will not be motivated to dig there everywhere.

The contrast of usual noise-signals and clear find signal has to be safe enough.

btw. the DeepMax Z1 guys missed to create a real useful 60-65cm coil.
Such a coil perhaps has 250grams more than a lightweight 45cm coil but its ALOT deeper !!!

[kt315]

[landman]

Here's something new and interesting...

https://www.youtube.com/watch?v=-5k6q1C4L64

[Funfinder]

Good job and sounds already professional but be very careful with the coil-cables and connectors!
This stuff often is not made for a higher stress level if it usually just has to sit tight and
without movement directly at the fixed electronic box.

http://www.geotech1.com/forums/showt...ared-detectors!

The cable also must be not too short so you still can sweep the coil at least one foot ahead your feet.
Keep in mind that the complete weight of 18'' (45cm) coil, cable, poles incl. arm rest alltogether
should not be higher than 1,2kg or maximum 1,5kg or longer hunts could become a hard job.
Especially if the terrain is steep the stuff you hold in your hand better just has max. 1kg in total if theres
a heavier coil attached.

[landman]

Funfinder,

I take your advise very seriously. At the moment I'm working
on weighing each part of the GroundExper and modifying the set
up. The jacket I've modified so the shoulder straps
are now detachable from the belt part.
I'm having the belt modified to allow me to place the battery,
6-7" tablet/screen and the control box on the belt.
Placing wool fur on the interior of the metal cuff.
Inquiring someone who manufactures
rod to see what the weight of their carbon fiber
equivalent upper and lower rods are.
Then I'll use Bluetooth earphoones/buds
with the 6-7" tablet. And get the control box blue tooth
from box to screen.
Then I'll be cooking with oil.
I'll post pics soon.

[Funfinder]

A very nice problem for those horizontal vertical two-box detectors is it
if the vertically coil hooks to a root, bush or whatever close to the ground while walking!
Bamm!


landman, you're right, there are many factors and the most important are:

What kind of finds, how large is the area, how much time available, what ground-conditions, how much experience and endurance.



About the Ground Exper:

I know you wanna have something with screen-output and the quality might be real good,
but when I see here already its construction:

http://www.metaldetector.com/drs-ground-exper-metal-detector

I get my doubts:

With the 45cm 18'' coil and that additional electronic box weight on your arm you may not be satisfied.
If you wanna use it just for 2 hours per day inclusive long digging-pauses not much problem,
but researching larger areas only will be a realistical option with the 1m coil and second person.

If you have the chance then test it to collect more P.I. experience and tell us your impressions,
especially how good the "discrimination" with different targets does its job. Its shurely interesting.
Important is that you test also the 1m coil with buried stuff or at least with the 18'' one.
And please check out for us how fast somebody really can sweeps the coil and walks with this P.I.
because time is a very important factor and it should not become a grandmothers walk in the park.


> Finding your target in situ.

Situations?

[landman]

I agree Funfinder and the same goes for me too.
It's one thing to pass on someone else's information
or claim, like the manufacturer and it's another
to do it yourself and see what the parameters actually
are in real world conditions.
If you are conducting the testing yourself
then there are still considerations such as:
Air testing
Having ground/dirt in boxes indoors and testing through them
Digging a hole outdoors and burying the target
Cutting a hole in the ground and sliding the target in sideways and testing
Finding your target in situ.

I'll be air testing my Ground Exper soon with the 18" coil and a large object.
Such as a Car and a very large copper plate.

[Funfinder]

Your statement: "this metal detector can find a car in 12m easily"
simply was completly illusional. From where you got this info?
From your own tests shurly not. So better don't spread it.

In air with such a cheap two-box thingie you may catch the distortion signal
of a big car (SUV) from 5-6 meters and if buried perhaps 3-4meters, thats all.
A tank or truck with over 5m lenght could be detecteble from around 10m in air.

But cars are not 15x15cm in size so its offtopic anyway.

The biggest problem with very deep and very large metal objects is
that it becomes real complicated to distinguish if its just a soil-difference
or a real find because the signal borders are geting blurred very strong.

payman, I don't have anything against you personally and I honor your work to
improve detectors, but there has to be a solid basis or its worthless for anybody.

This here is not the LRL forum with its many dreamers who are completly
unable to provide recreatable and everywhere working detection-results ...

[payam20]

dear fun finder ;D

do you know whats sheild doing ? do you know how does two boxes work ?

iam not hear to fight with any body or to lie (will i proffit if i lie ?? do you pay me for lie?)or even i cant sell any thing to any body becuase i cant .

i will work on sasho and I promiss u to do my best and then i put pcb and schematic and ... here for every body .( becuse i belive that every body can mak his own metal detector instead of buying expensive metaldetector )

[Funfinder]

Hi
so if we use 110*110cm coil and Burial it under mineralized soil and search by DP2 can detect on 2.5meter? or top of this?
in not mineralized soil (natural soil ) can detect that on 3 meter?
regards

http://www.geotech1.com/forums/attachment.php?attachmentid=31822&d=1416616872

http://www.geotech1.com/forums/attachment.php?attachmentid=31828&d=1416658911

The good reputated DeepMax Z-1 P.I. detector finds a 15cm thing at ca. 135cm in air with the 1m double coil
(100 x 100cm x2) but only at 80cm a buried 20cm thing with the 45cm coil or with the usual 1m coil.
In-Air-values for P.I. is like "radio-reception" or "radar feedback through air" - not really countable.

Non-motion induction balance circuits for shure works better - especially if the coil almost touches the the ground!

btw. the optimal coil-size to detect a 15cm object most deep should be ca. 80 cm diameter or lenght
if the detector is not very sensitive or 130cm if its really critical adjusted. But in this case it will not
find very good stuff that is smaller than 15cm as long its not buried pretty close to the surface.


The first real important step for real 15x15cm plate at 2meter detection can be done with a special
second ultra-sensitive circuit. Of course this one can't be used under usual conditions but it can be used when:

Moving the coil very slowly, without any metal near the body or detector at all, if the soil is very low
mineralized and if there are no e-smog sources nearby. For normal usage absolutly not acceptable !!!

But if you know a spot of just 15x15 METERS and you can handle the ultra-noisy-output, you may succeed!

[mohandes]

can detect that on 3 meter?

with Allah', magic Al Koran texts and a mantra speaking so yes, 3 meter. anotherway only 2 meter.

so yes find in 2 meters

[kt315]

can detect that on 3 meter?

with Allah', magic Al Koran texts and a mantra speaking so yes, 3 meter. anotherway only 2 meter.

[mohandes]

Hi payman20, if you wanna learn something here please listen and don't spread wrong info!

- If the box is shielded its even more metallic!

- do you think 30cm above ground will be much better? The coil(s) have to be 5-10cm above ground!

- 12 meter!!!! for a car !!!!??? With such a little metal-infestest 50cm mini-coils-construction?! Are you kidding? Hahaha !!!
Who told you such crap? If you haven't tested it by yourself and with buried stuff don't believe and tell it!
In such a case you would need a 5 times !!!! stronger and highly stable EM-field and the coils have to be at least 2m away
from each other!

Whats good about such detectors is that those are mostly nonmotion induction balance ones that even can detect cavity
if they have not been crippled like the new Whites 808. But they should have been concepted much more
"cover a huge area in a short time"-friendly and not as:
"Walk with some coil-construction like an umbrella in your hand over the pampa!".

Have fun with your experiments!





@ kt 315 - metal screws directly close to the coil...
At least those small coils can be held much closer to the ground - this is really good.
But vertical with horizontal still doesn't match! The 3 dimensional field of EM-waves has to be at the correct orientation.
Even the LNB for a satellite must to be adjusted from some degrees to over 30° if its located not directly south.





@ whoever, everyone, all or generally spoken:
Back to the main question: a 15cm x 15cm square or a metal plate with 15cm diameter of course is detectable @ 2m (6 ft)
but only in air so far! Adjust your P.I. with 75cm coil to high critical and listen to the slightly faster geting knocking-pulses...
Just this doesn't work with buried stuff if it isn't buried below 2m of wool, wadding, hay, nonmineralic glass or dry sawdust.

Realistically seen you will find metal in such size only at ca. 130cm buried if you walk at a dry day
very slowly over not very strong mineralized soil with a detector that has at least some 45cm coil!

And if you hold your "2 box" (I wonder where it has any boxes at all...) 50cm over the ground you will never find a
15cm thingy below 50cm because it makes a big difference that there is not much air inbetween coils and floor!

Hi
so if we use 110*110cm coil and Burial it under mineralized soil and search by DP2 can detect on 2.5meter? or top of this?
in not mineralized soil (natural soil ) can detect that on 3 meter?
regards