TGSL Experiments

[golfnut]

I worked for electroncs firm.

I have seen a case where light gave cct extra noise.


Is your cct in a lightproof enclosure?

[ivconic]

So what else could affect the coil when moved between an area of shade and one with sunshine?
How about moisture?

What if sun rays do carrying some magnetic features?
Or causing momentary changes in Earth magnetic field?

[Qiaozhi]

I had same idea than, so i tried.
Need several minutes of "hair drying" to affect a bit the threshold.
Yesterday also tried with 1220B which is suitable for this test because it has adjustable threshold and as non motion is liable to drifts.
Actually, there were no changes in threshold after 2 minutes exposing it on hot air!?
Funny!
So... must be the temperature combined with soil preferences.
I could even test that... but am afraid that someone may see me "hair drying" the soil and think that i gone mad!

So what else could affect the coil when moved between an area of shade and one with sunshine?
How about moisture?

[ivconic]

Although the coil wouldn't have time to warm up, there would be a sudden change when moving from shade to sunshine. Also, after that, the coil temperature will be increasing slowly. Perhaps this affects the threshold somehow, and increases the sensitivity.

See whether you can duplicate the effect indoors using a hairdryer.

I had same idea than, so i tried.
Need several minutes of "hair drying" to affect a bit the threshold.
Yesterday also tried with 1220B which is suitable for this test because it has adjustable threshold and as non motion is liable to drifts.
Actually, there were no changes in threshold after 2 minutes exposing it on hot air!?
Funny!
So... must be the temperature combined with soil preferences.
I could even test that... but am afraid that someone may see me "hair drying" the soil and think that i gone mad!

[satdaveuk]

guess what make/model im holding in my profile picture detector

come on boys and girls earn a brownie point guess what my detector was that im holding and which may i add to date best finds in my profile picture, i doubt you will guess right

[satdaveuk]

snow

same princables as your all talking about i notice a big change on metal detectors in the snow i found that my Dfx is alot more accurate and seems to get that much more depth where as my quattro is more reverse and gets quite chatty, and yet same field which i been stomping on for a few years in the summer its the quattro thats the better machine, well apart from gold lol

[Qiaozhi]

I though so too at the beginning.
But later i checked that many times and seems it is something else, not temperature.

Although the coil wouldn't have time to warm up, there would be a sudden change when moving from shade to sunshine. Also, after that, the coil temperature will be increasing slowly. Perhaps this affects the threshold somehow, and increases the sensitivity.

See whether you can duplicate the effect indoors using a hairdryer.

[ivconic]

This is why I wrote "up to 30%", although I appears I was being optimistic when compared to the soil in some areas.

The most likely reason is the temperature difference on the coil, as it moves from the shade into the light.

I though so too at the beginning.
But later i checked that many times and seems it is something else, not temperature.
Because i checked that with various brands and coil colors (black coil at Garrett, black coil at Spectrum, black coil at Musketeer, white coil at Cscope, white coil at Tesoros...)
So it is momentum change of behavior, there is no time coil surface to get "warm" under sun rays influence.
I can swing coil in shade (under bushes or some tree) and it performs good, just moment after that i can step out in sunny spot and the very same second detector is starting to behave different!? There is no time coil to get "warm".
At first i experienced and noticed that with my home made TGSL and coil, so than i suspected my hand made coil.
But few days after i took outdoor Garrett GTI2500 and it did the same.
After that day i am not skipping chance to check that again and again with various models.
Last i did with XP Gold Max Power and it was more drastic in behavior than others.
Time of day usually is early in the morning when sun is just about to fully appear or late afternoon when is about to sunset.
And usually there are shades and spots where there are no sun rays to reach.
On such spots this phenomena is most visible.
I tend to believe that it is up to something else but not up to sudden temperature changes.
Yet i am not sure, can't say for sure.

Come to think; most probably i experienced this many times in the past too - only i didn't payed much of attention on it.
Because, in the past mostly i had non motions and somehow get used on their "proverbial" drifts which is so typical at such machines.
So i construed such behavior as usual drifts at such machines.

[Qiaozhi]

That depends on soil conditions and soil content.
Lost can be less or more than 30%.
I've seen soils where difference overcome 50% and also soils with less than 10% lost.

This is why I wrote "up to 30%", although it appears I was being optimistic when compared to the soil in some areas.

I've also experienced one pretty interesting and funny phenomena; same soil, same time, same detector, early in the morning walking with detector; i noticed better sensitivity on places where sun rays are still not illuminated!?
On places where sun rays are arrived (stepping from shade to illuminated place) detector all of the sudden starts to behave different!
(it is not because of wet or dry soil there but seems because sun rays just appeared at that particular place!?)
This i noticed few times with branded Spectrum, Musketeer and Explorer SE mostly, but also with others too.
So it is not only up to soil, it can be dependable on "air" conditions too, sun rays (some magnetism or what...) and possibly some other factors too.
I think i read somewhere that sun rays are also carrying some magnetic preferences too (or somehow affects momentary earth magnetic field).

The most likely reason is the temperature difference on the coil, as it moves from the shade into the light.

[ivconic]

For VLF detectors, the difference between air and soil depth measurements can be as much as 30%. For a PI, the difference is very small.

That depends on soil conditions and soil content.
Lost can be less or more than 30%.
I've seen soils where difference overcome 50% and also soils with less than 10% lost.
I've also experienced one pretty interesting and funny phenomena; same soil, same time, same detector, early in the morning walking with detector; i noticed better sensitivity on places where sun rays are still not illuminated!?
On places where sun rays are arrived (stepping from shade to illuminated place) detector all of the sudden starts to behave different!
(it is not because of wet or dry soil there but seems because sun rays just appeared at that particular place!?)
This i noticed few times with branded Spectrum, Musketeer and Explorer SE mostly, but also with others too.
So it is not only up to soil, it can be dependable on "air" conditions too, sun rays (some magnetism or what...) and possibly some other factors too.
I think i read somewhere that sun rays are also carrying some magnetic preferences too (or somehow affects momentary earth magnetic field).
....
To Salih,
maybe your coil is not that good? I had much better results in soil with TGSL.
Or maybe your soils are hard, mineralized or similar?
You should perform same tests with some branded detector and compare.
Also TGSL is maybe not most suitable for deep iron detection.
What are your most desired targets?
What do you looking for in soil, mostly?
No brand nor model can be suggested to you before you define the type of desirable targets.

[salih]

Experience

hello to all
My experience with TGSL I think Was a waste of time and Money I want to collect metal detector is not for fun . my life my future depends on the metal detector Successful . If any one knows Metal detector successful in ground, Please let me know and Thank you.
Greetings

[satdaveuk]

30% !! Where I live it's more like 50%!!! Even the local White's dealer will agree with me on that one where we live.(In disc mode).

PI is the only way around my depth problem (or lack thereof).

yes same here wish someone on here would design a self build PI with good disc, stand more chance of winning the lottery lol.
Hey Simon when you have spare time maybe you could work on that one with your simulater, cause at the moment your workings are fantastic hint hint

[dfbowers]

For VLF detectors, the difference between air and soil depth measurements can be as much as 30%. For a PI, the difference is very small.

30% !! Where I live it's more like 50%!!! Even the local White's dealer will agree with me on that one where we live.(In disc mode).

PI is the only way around my depth problem (or lack thereof).

[Qiaozhi]

hello to all
my MD tgsl in Air test I Get 30 cm for coin 2.2cm in all Metals or in VLF its same.
I went to the test Tgsl on Field ( coin 2.2cm)
In the position VLF, on max sensitivity I Get 15cm Deep in the ground
In the position all Metals I Get 20cm Deep in the ground
Is this really Results tgsl in Field
I need ideas Please
Greetings

For VLF detectors, the difference between air and soil depth measurements can be as much as 30%. For a PI, the difference is very small.

[Jerry]

I laughed at that pouring too because it was very skillful, I guess they couldn't make a machine to do it as well. I could never pour so perfectly though.

The coil winder seemed funny also -- was it my imagination, or was there a kind of unsteady wobble going on?

-SB

I think the wobble is because they are winding a elliptical coil which made it look that way when it was turning.

Jerry