Jeohunter - Visual Ground Scanner

[dleslie]

Hello Fundfinder. I recently purchased a JeoHunter and have started field testing. I buried an old axe head (10x15cm) 60cm deep and an old shovel head (30X40cm) 90 cm deep, and had no trouble detecting them with 80% sensitivity, which conforms with the manual specifications. I was very happy with this aspect, even more so when I detected (by chance) a large 1860 brass horse buckle that I had missed using my Minelab Terrascan at 35cm. However, the depth scan results were well out - typically 142 and 147 cm deep respectively. I played around with the width and length measures but they had little bearing on the scan results. I think this may be due to the soil conditions - very wet red sand, almost at field capacity. Could this explain the poor depth results? I assume the algorithms are based on a specific soil type and moisture content far different from those present locally. Every second scan also failed (poor scan message), and while in ferrous off mode I regularly picked up ferrous metal, but only larger pieces and typically caste iron or hoop iron. Scans typically showed these as 'iron', which was pleasing, but also occasionally as precious metal. I appreciate I have some way to go before mastering this MD! My next field test will be to try to locate unmarked graves at the local cemetery. The soil there is dense grey-brown clay. Can you give me any tips that may help find cavities in these soil condition? Regards, A Jeohunter Novice

[Funfinder]

Hi and thanx for the interesting posting.


It confirms that even beginners already can detect very deep stuff but of course this is just the beginning, now, a little bit later you will find much more and deeper stuff.


> very wet red sand

I guess this will be indeed a very compact and EM-fields shielding material. Not just because of the mineralization, but also because of the high mass (weight) this kind of soil has.

To get best results, you need to get some experience about the signals while hunting on sensitivity 9, slowly and if possible very close to the ground.
At the beginning time you may think there is a find because of the sound but at high sensitivity lifting or lowering the coil some inches or cm can cause such signals if the ground is high mineralized and therefore you must learn to doublecheck the signal by reseting the Jeohunter a half meter near the problable find and move again the coil slowly and at the same distance over that area to find out if it comes really from a metal-object.

This is a non-motion circuit therefore it is always new "stable adjusted and fixed" by pressing the reset button to the small "no signal"-window inbetween cavity- and metal-alert so you must train a bit to stay within this window if no buried metal is nearby by keeping the same coil-ground distance and by pressing the reset-button from time to time so the Jeohunter can work with the changed ground conditions.

The depth scan is very reliable - we have tested this many times already - the only thing is:
If the objects are smaller as 10cm x 10cm, even if they are 4cm thick and 15cm long, you may get much higher depth results.

If you depth-scan a buried coin at 10cm the Jeohunter may show 40cm depth because it only can see the weak signal and assuming it would be 10x10cm in size (this value would be for quadratic metal-sheet) usually it must be located deeper. It is also important that the coil is 10cm about the ground while you measure the input size with the coil-edges, needed for the depth scan. Many times just input 10cm 10cm or 20cm 20cm if the signal is larger and you get a good depth-scan-result.

Of course if the ground is very high mineralized or compact ("compressed" if compared to usual ground) the depth scan results may be different somehow.
And sometimes the steel detection goes into the area of gold, because this depends alot on the size and shape of the object.

For this wet red sand region I recommend that you will use Ground Balance value minus 100.
Try some tests how fast you can sweep the coil without wrong or erratic beeps (this also depends how flat is the region there, if its a beach it would be perfect), start with Sensitivity 7 first but after 1-2h raise it to 8 and after another short time try to hunt with sensitivity 9 there.

And I recommend you start with iron-on mode because it is 25% deeper than iron-off mode depending on the kind of metal and for very hard ground conditions 25% can be alot. If you found something and you have rechecked that it is really a find you can switch to iron off mode at this spot and find out if its still detectable or not. But for the initial learning-curve it is always better if you hunt in all-metal mode because that way you get much more and deeper finds and therefore better learning-experiences.

The absolutly highest strenght the Jeohunter with the standard 45cm coil has for objects from 5cm up and vor very deep stuff.

Finding those graves at the local cemetery may be not a good idea because it depends on the metal- and cavity-values and it could be low if the graves are deep and already broken and therefore with no or only very small cavity. It depends on the ground and depht and how close the graves are located side by side if you can get a high enough contrast value. If there is also this high mineralized red sand you may get good results.

I wish you good luck and ask again if you need more specific info.

If you have a smartphone or digicam you also can film some of your field-tests and post it here.
If you have learned how to master this detector you will be able to locate the most deepest and a bit larger finds possible at all - especially if you also have the 1m coil.

And try to start hunting and moving over larger areas directly very fast - one of the biggest demotivating factors are no finds because the 5x5m beginning area simply doesn't contain any. The more squaremeters you can "scan" with your coil within a short time, the better it is. And it is better to get a rough overview over the whole location first, anyway instead of being sticked to a small area. With this detector you can scan through 10.000 squaremeters within a half day if you have enough muscle-strenght and experience, and this works expecially very simple if you have learned the whirl-wind method by spining around your own axis while slowly walking forwards. The Jeohunters coil is the perfect counterweight for this method and it will become lightweight as a feather that way.

But first start it slowly and simple, the important thing for now is that you can distinct real targets from wrong signals and that you can find out better and better the weak targets.

Have a great time.

[Funfinder]

Welcome huge world - the 3.wheel of the 1m Jeohunter coil is ready to go!

Finally the real "high-efficiency" treasure-hunting can start:

Now with the 3rd wheel its possible to drag the coil the broad side over the ground.

The idea how to attach the 3rd wheel was simple and perfect - using just some very hard wooden board for the wheel-fork
and improve the strenght there, but usual it's only around 4-12 kilogram weight force - so no big deal.

Depending if the 3rd wheel is attached below or over the coil (both is easy possible), the coils ground-distance is ca. 5cm to 15cm.
This is perfect, depending how flat etc. the surface is. And as it has been tested already, its no problem to search at
sensitivity 80-90 if this huge coil is almost directly over the floor. If it would be higher just a loss of depth would be the result.
At very stony etc. regions or inside some kind of jungle still the possibility with 2 holding belts exists - the usual 2 persons solution.
But sometimes its better to do such work on your own, not all the time somebody else has time etc.
Of course to dig really deep and large holes someone to help would be great, and with this coil I will go for the real deep and huge stuff.


In our modern days of china-plastics such a "scooter" could be produced very simple and cheap and perhaps Makro Group will see
the fantastic possibilities such a device offers and includes it to his profi-package which also includes the 1m coil.

If the non-metallic pole and the coil-cable is long enough or extensionable, such a "highspeed-searchcoil" also could be attached behind a car or bike.
That way flat huge regions are open to real treasure-hunting and discovering new promising hunting sites will come in easy reach.

With this construction now per instance even deep sunken larger war-remainings can be found just by driving around fields, plains or whatever.

This coil is sufficent to find already 3-5cm (1-2'') small stuff near the surface but the real power starts with around 10cm finds and below 50cm depth.
Of course everything with discrimination and also cavity can be found.

Not to forget: treasure-hunting this way is much more relaxing! Its like a walk in the park and dragging some lightweight cart behind.
Even some drink-bottles and food in plastic-boxes can be put on top of the coil so the backpack or whatever remains lightweight -
at least in the beginning.

And what I sometimes like the most is..... discrimination by size! That way someone can fully concetrate on the "huge finds".
Many of them still are crap but its still much faster to find the real precious big stuff and those finds which are not reachable
by the usual sized metal-detectors (with coils up to 45cm) at all.


Too bad at the moment its deepest winter here but I'll present you the first test-results in spring.
Good luck and let's hope that this new great "hunting-method" incl. whats needed will be available soon for everybody.

[landman]

Read every word of all 26 pages and in a word...Excellent!

[Funfinder]

hi landman

thanks for your big interest in this kind of special detectors and technology. If you have any further questions just ask.

Good luck.

[Funfinder]

Jeohunter Volume Mod 2014

My Jeohunter is already from 2010 and it was produced and developed around 2008-2009 but it is still a great and of course fully working detector!


My DeepHunter moding-activity yesterday was inspiring, thats why today I made the Jeohunter volume mod.

I had a spare "big potentiometer" but I wanted to save it for something else later so I used one of those little variable resistors.
After I soldered the cables I filled the backside with melted plastic so it will hold at the Jeohunters plastic case.

btw: learn to melt plastic with your soldering-iron, learn to bring plastic into the wanted shape and form if its fluid, it will give you alot profit.

Afterwards fastly get fresh air into your working-room or use ventilation otherwise it coud became a serious health risk.
But I did this already hundred of times an never had any problems, so don't be too afraid.

And depending on the chemistry you should not get a huge amount of direkt smoke or fume into your eyes, it could feel like acid.
But it can absolutly give you great results if you melt plastic-stuff with your soldering iron or mount parts directly.
Have some paper tissues ready on the table to clean the soldering iron from the fuming rests directly after every working step
to reduce poison gases and don't burn your fingers while cleaning the soldering-iron tip - it can happen faster as you think.



the mod is totally simple:

Disconnect and remove the accu-pack.
Open the 6 screws on the bottom, cut the white cable (the yellow one does not work) which leads to or from the headphone jack
and solder 2 cables and 1 variable resistor or potentiometer inbetween.

Of course this mod is pure luxury if Audio Volume step 1 out of ten still should be too loud.
And yes, personally I think audio set digitally to only level 1 sometimes still is a bit too much.
btw. The most simple mod (I used so far) is to stick some cartboard before or inside the speaker hole.

Finally find some place where to fix the variable resistor - The side with the other connectors is the best choice.
If you are experienced in melting plastic you can directly join the resistor with the plastic box wall, no problem.
But I haven't melted any larger grip or handle to the little usual screw-driver adjustable turnable part of the resistor,
because it was already good enough by default at the used location for adjusting the volume directly with the fingers.


The Jeohunter now after 4-5 years may be already "retro" for many persons but If you can get it for a good price
and if you are interested in cavity detection and very deep larger objects it is still one of the best detectors ever.
And you can even modify the DeepHunters 1m coil to use it with the Jeohunters coil-cable connector and use
some wheel-roller for the ultimative treasure-hunting experience!


Jeohunter 2014 volume mod c.jpg connectors from left to right:
headphone, coilcable, resetbutton-connector, LCD-on-off switch and now the new volume control

[Funfinder]

MEGA SEARCH

Attention:
The following treasure-hunting method was completly invented by me.
It works perfectly with Jeohunter and DeepHunter ONE METER coils!

Please don't copy it for other detectors with lousy 1m P.I. coils - you need induction balance to get it work.



The coil moves perfectly at around 7-10cm (3-4 inches) over the ground !!!

Draging is super easy !!!!

See the pictures to get finally a first REAL VIEW of the size relations in this world - HUGE MEADOWS ETC. NEEDS HUGE COILS, at least 45cm!

The pole has to be fixed beyond the edge of the coil so it can be layed down on the ground and to roll the coil forwards but also back.

Weight:
I brought the detector, 1m coil and what was else needed by mountain-bike to the hunting-ground, but you need some fitness for this,
especially if you have to transport afterwards heavy finds the return way. Better use something motorized.

Sensitivity:
It is truly amazing, but the Jeohunter's and also the new DeepHunter's 1m coil is able to hunt with sensitivity 80% at such very close range over the ground
WITHOUT false beeps - with iron on and at normal to fast pace speed.
Of course this is much better concerning higher find-rate compared to walking with this coil 20-35cm over the ground with 2 persons!

Maximum sensitivity: With some experience and with reset-button mod it is no big deal to hunt at 100% sensitivity and with iron off.



User-Friendly:
This is perfect - even a child can drag this coil hundreds of meters over the flat areas!


Needed:
A lightweight Mini-Metal-Detector for pinpointing is very useful. See the last picture, such a cheap 30 Euro security-detector already does a good job.


Cavity:
Don't forget: With DeepHunter or Jeohunter and the 1meter coil, you also can find huge cavity and cellars. No P.I. will show you them.


Searchcoil-cable:
It has to be fixed near where the pole is attached to the coil to reduce swinging and moving around.
It is absolutly no problem leading the coil cable over the outer ring of the search-coil and fix it directly where the pole is mounted by a rope.


turn around radius:
ca 1meter or 3 feets
This means if you wanna go back you can "drive" easily if the road is 2meters broad
but of course you also can move the coil by hand directly 180° against the earlier direction.


Extremly high amount of searched area:
This coil is 1meter broad (and it can find already stuff from larger coin size if its close to the ground !!!).

Here some calculation:
1meter broad and walking forwards 2,8 meters in one second x 60 = 168 square-meter per minute !!!
168 x 60 = 10080 squaremeter per hour which is a size of 100 x 100 meter or 10 x 1000 squaremeter
which means you can search 10 rows each 1km long if you walk at 10km per hour speed.

With usual detectors (and heavy 45cm coil work) only a 5-10th of this is possible not to forget
the extreme burden for the muscles while draging the 1m coil is as good as no work at all.


Prospecting:
It all starts to find first a location where really is something precious to find.
People have to consult geologists and have to drill testholes in the mountains just to see if is something there.
But the same applies also to treasure-hunt: First a lucrative and good spot has to be discovered!
So the 1m coil is perfect for this task and afterwards you can do the "fine-search" with smaller coils,
but first a good and promising area has to be found at all - and you don't come very far or deep with the usual small coils.
So this new 1m coil drag-technology is perfect to reach so far undiscovered treasure-locations.

Good luck!

[Orbit]

Hello Fufindr !- do not read all , Tell me How do you know the cavity ?whether the tone increases or reducing the ?

[johnny777]

hello Funfinder!...
i see im new in this site and i need your help now..pls!..
i have jeohunter 3D buy marz 2013 and i use it in filipines.
the 1st scan is around 6m deep and they scan the object is exactly 42cmX49cm so we happy but..
after we diger almost 8m deep stil nothing!
and next project we also scan inside bunkier coz that time i dont know if the scanner is not for scan inside any bulding
also betside any buildin...sorry...
but now when we try scanning really material litle deep the scanner always schows nonsense like iron is gold and also
the gold is iron...
i think the scanner was out of tune bcoz of the scan inside building..right?..
I now need your advice what should I do with it? ...
thank you so much if you help me
best regards
Johnny
P.S.
im very sorry about my english coz not good

[Funfinder]

The timing with those new posts matches good cause just 2 days ago I was 8 hours on the way with my still super working Jeohunter!
For sorting out finds by size at huge areas (just finding the big stuff) this detector is simply the most effective.



@ Orbit
> Hello Fufindr !- do not read all , Tell me How do you know the cavity ?whether the tone increases or reducing the ?

Hi Orbit,
cavity is the deeper tone, you can simple imitate cavity with a brick-stone or hot-rock.
Usually cavity gets detected if the soil or ground gives good enough contrast (therefore it must be at least somehow mineralic)
compared with the sealed hole, tomb, tunnel, cellar or whatever. It needs some experience because this is a high sensitive non-motion-detector
where the zero-point or quiet-zone of the detector easily can get out of center at sensitivity 80%-100%.



@ Hi johnny,
Congratulations that you could get a Jeohunter.
Did you got this ultra deep detection result with the 1m coil?!

Usually such very deep targets are extremly hard to detect so I doubt it was a real signal.

The thing with steel confused as gold is pretty complex - it has to to with the size and shape and alloy and the soil-conditions.
Usual low quality iron gets discriminated very good and it does not show up as gold, but steel objects can.

johnny777, since you're very new to the Jeohunter usage I suggest first you start with some test to get experience.
Bury a soft-drink can or a fuel-container or something larger 1-2meters deep and try out how good you can detect it
and what kind of detection-analyses-screen-results you get.
That way you also learn if the detection-results are proven real and not the cause of unclear coil-movement or
changing ground-conditions.

However I wish you already good luck; with this detector you can search through huge areas and
it is totally immune against electro-smog. Just ask if you need more info, your welcome.

[Orbit]

@Hi Orbit,
cavity is the deeper tone, you can simple imitate cavity with a brick-stone or hot-rock.
Usually cavity gets detected if the soil or ground gives good enough contrast (therefore it must be at least somehow mineralic)
compared with the sealed hole, tomb, tunnel, cellar or whatever. It needs some experience because this is a high sensitive non-motion-detector
where the zero-point or quiet-zone of the detector easily can get out of center at sensitivity 80%-100%.





thank you Funfinder !understand how does it work believe it ...

[johnny777]

Hi, The result I got was while using the General search coil. are you saying that it is impossible to get such result with this coil? The thing that it was confusing with gold was a beer cap. From what I understand there are many different metals that go into such cap and that why it confused it with gold is that correct?. Thank you for your help

[Funfinder]

Hi Orbit,
thx for your reply saying that I could help you.
btw. if you hunt for underground room things it is good if you have already some cavity-test-object hidden at the same ground- and soil-conditions.
That way you can see how deep it is located and what ground-balance value gives the highest sensitivity. Usually a lower ground balance value
(a value at around -70 to plus 40)) raises the sensitivity for special mineralic stones and cavity.


Hi johnny777,
The general search coil is very deep:
it will detect a 30x45cm Alu-case at 2meters distance or a steel door at 3meters50 in air, all metal, 100% sensitivity.
I have tested this personally. In usual ground this is reduced but the result is still good - if you have enough experience.

Beer-bootle caps are always a big problem - almost any metal-detector finds them as "gold" or even higher valued metal.
Its because of the shape and the alloys.

The depth-scan-screen only shows the correct deep-values if the detect object is 10cmx10cm or larger.

And most of the time, as example if you hunt for a treasure-chest or a box made of steel,
you will get a very large find signal and if it is deep it shows a very low (flat) curve (=weak, deep signal) on the main screen of the detector.

A very short beep with high oscillator-curve on the screen (formed like a steep mountain) instead most of the time signalizes
that the find is pretty small and close to the surface.

Sometimes first also the new modern civilization metal trash has to be removed from a hunting site until the deeper stuff becames detectable.
You can do this with a little metal detector if its faster.

I wish you good luck, this is now just a little bit the beginning problems, after that you will get fantastic finds.

[johnny777]

Ok thank you so much for your reply. I also wanted to ask one thing, from what I understand when, we input the values for the depth search, I undertand that we enter the percieved size of the object that we are looking for not yes? For exmaple if we are looking for something small we input 10x10 cm and if we are looking for something like a barrel 100x 100 cm? is that right? I also have constant issues with calibrating the ground effect, it seemes like sometimes i set the ground effect to 45 than the scanner works ok, in 10 minutes i reset the scanner and at 45 it doesnt work at all and I have to recalibrate it. Could you please give me some advice on how to calibrate the ground effect till perfection? THANK YOU SO MUCH FOR YOUR HELP!!

[Davor]

Beer-bootle caps are always a big problem - almost any metal-detector finds them as "gold" or even higher valued metal.

That's because they are made of galvanized steel, and the thin coloured metal sheet on top of steel responds as small gold - which also comes in thin sheets.
There is a way around it. Any detector capable of reacting to iron with different tone will at some point give the iron tone when encountering a bottle cap. Same is with spam cans. Point is that iron objects are prone to orientation affected detection. So every iron object pointing at the detector coil will have much larger signal than the same object laying flat against it. My simple IGSL has a lower tone responding to iron (dah), so such targets respond as dah-dee-dah in each direction. Same goes with steel cored coins as well.