TESORO GOLDEN SABRE

[Fred]

If anyone has a better online/offline inductivitiy calculator, please let me know.Aziz

Hi Aziz,
Here are 2 calculator.One unfortunately in French , .xls file,the other from elektor, looks quite precise.you have to extract files to the same folder.
regards,
Fred.

[Aziz]

Hi Aziz,
Here are 2 calculator.One unfortunately in French , .xls file,the other from elektor, looks quite precise.you have to extract files to the same folder.
regards,
Fred.

Hi Fred,

many thanks for the calculator. I will test them tomorrow.
Nevertheless, I have to measure physically the coils to check the coil software (I am surely be suspected of my calculated results). For this purpose, I want to buy a new multi-meter with more accuracy tomorrow. Then the same procedure as usual - coil winding.

Regards,
Aziz

[ivconic]

Ok Ivconic, thanks ,
You died making them?
But what about detection distance? i don´t like very much the beahaviour of the DD, really omega and CC seem to be more reliable in several aspects, so i would like to try a good one of those.
As i said, for CC i was able to achieve a good null, but inductance was bad, so was the frequency,because of influence of bucking coil.This would not be so bad with omega i think.
regards,
Fred.

Yes, at the time i had much problems to achieve good null. But after much of efforts, somehow i managed to make it to detect single coin (2cm) at 27-28cm in air. Oh yes coil was 24cm diammeter.
Inductance-frequency??? Than you should try to adjust proper frequency changing capacitor in oscillator; try to replace 0.022 with 0.027,0.033 or 0.039 instead, and than measure frequency. Leave RX unchanged.
I dont think you made proper DD coils since you are not satisfied with it? DD coils work excellent with TGSL!
Pinpointing small object is easy; move fast coil east-west and north-south over the soil surface and you will easilly distinguish the very center of burried object.
DD coil is superior over cc considering depths. Also very small coins are easilly detected with TGS&DD coil. Only! Only...when prospecting very small silver coins, you must go bit slower with coil sweeps and try to hold coil just a few mm's over soil surface...almost touching it with coil.
From earlier experiences, good prospector must know character of visited terrain, meaning you must know what to expect on that terrain. Usually i do know in advance if i can expect to find small silver or gold coins on some terrain. So according to that presumption i do use proper searching technique. On leveled, unknown terrains i do walk very fast with wide sweeps. On hills with a lot of bushes arround i do walk slowly, short, narrow sweeps...etc.etc...
I tell you; dd coils doesnt have important disadvantages comparing cc or omega coils. Trust me on that. Besides...if you still have doubts in my words...just look Minelab best coils; all DD!
Regards!

P.S.
Minelab is still "great daddy" in metal detecting world, so i almost always use their products as sort of references. Although White's is also "great daddy" too, yet they mostly using cc coils with their products.
But, latest 45cm coil for DFX is DD !?!?!?
I think both of mentioned manufacturers are just used to make type of coils they adopted as best for their detectors, meaning again - no rule at all! Anything will do if made properly...Plain truth!

[Fred]

Hi Ivconic,
Thanks for info !.
I had good depth with DD, but i found a bit less precise and less stable than with my omega.But if you say it works OK then i will try to build a new one.I want to search where there is rocks etc, so i will try a smaller one, around 20-22 cm.I will use this 0.25mm teflon wire.
Good luck!
Regards,
Fred.

[ivconic]

To all other members here;
do not be confused with my various reports on coils i made. All of those are excellent if made properly. Differences are minor, less than 2-3%.
I do have much spare time to experiment so i made a lot of coils all types.
Doesnt mean that i left one type and start with other cose not satisfied with previous. It is only cose i do like to experiment.
BTW this forum is just about that; to experiment and experiment. By experimenting and making a lot of things...man can only learn more, stay in good shape and "updated" with facts.
Knowledge is a sort of discipline. If exercised on daily bases - good. If left as it was - very bad!
In the past i was pretty succesfull Cobol programmer. I havent done anything for 10 and more years. Now, these days, listing my old codes, i feel as totall ignorant! Nothing to understand there!?! Was it me? Was i written that code??? Sheeesh! So, knowledge is discipline for sure!

[Aziz]

The fact of the CC-Coils (concentric coplanar) is, that they have to compensate the magnetic field flux (Φ) inside the flux area of the RX coil (A).



Otherwise, it wouldn't be balanced. This causes decrease of the magnetic field density and strength (B, H) on the center position of the coil compared to DD or OO coils. Magnetic fields of DD or OO coils need not to be compensated. So the fully possible magnetic field density can arrive the target and maximize the induction effects.


(Uind=induced voltage, n=number of windings)

What we have to do is, minimizing the compensation magnetic field over the center of the CC-coils. I am working on this and probably I found an ideal solution for this. I will know in few month, whether such a CC-coil is possible. I am still working on the coil software and it is pitty, that I have to wait until some important implementations are done.

Aziz

[Aziz]

What we need is a magnetic field density/strength profile for CC-coil like below:

[Aziz]

Best CC-coil should not compensate its magnetic field. In this case, we have only one TX-coil (Radius R3) and two RX-Coils (N1, R1, N2, R2).
N1 = number of turns for RX1
R1 = radius of RX1
N2 = number of turns for RX2
R2 = radius of RX2
R3 = radius of TX-coil
Balance is made by R1 <= R3, R2 > R3 with appropriate radius and number of turns N1,N2 and the RX coils are connected in serial with opposing winding directions (differential mode). Remember,

the total Φ(N1,R1,N2,R2) gets =0 over the total flux area of the RX-coils (A).
Is anyone interested on experimenting with such a CC-coil? I can provide all the needed parameters.
Aziz

[tiktak]

Hello,

Hello,
Did anyone have data for DD 45cm?
Any sugestions?
I see that Minelab Relic Halk is now selling with such?
This is hugh thing should reach very deep!

[Aziz]

Best CC-coil should not compensate its magnetic field. In this case, we have only one TX-coil (Radius R3) and two RX-Coils (N1, R1, N2, R2).
Is anyone interested on experimenting with such a CC-coil? I can provide all the needed parameters.
Aziz

Hi,
here is the coil I meant:
RX-inner and TX are on the same core. 4 mm distance to mean radius.
This is not an April joke!
Aziz

[erolunall]

hi tiktak

45 cm coil is about 70 turn for 4369 inductance 0.3 mm wire

http://deepfriedneon.com/tesla_f_calchelix.html

you can try to find wich turn which diameter

give turn spacing = 0 use mm check button


Regards
Erol

[tiktak]

Hi

Hi,
Thanks.
I will try!
I still cant understand this calculator of yours but this is a start!
70 turns of 0,30mm wire.
The probleme is that I have only 0,25 now!
SO?
What should I try?
This 70 is for TX right?

[erolunall]

Hello Tiktak

you can give 0.25 mm for Wire Diameter

you have to find 6340 inducance ( please look old mails about real inductance of rx and tx)

45 cm= 450 mm for radius

turn spacing =0 (zero)

you have try diferent turn giving value to number of turns to obtain İnductance (6340 or what is real L)
pressing tab every try


please select mm

Erol

[Unregistered]

HELP!!!

At the first, excuse me for a orphography, beacouse i am from Ukraine and don't understand English language very much, maybe somebody now layout to Tesoro Silver Sabre Plus??? Please write to me link from web...

[erolunall]

Hi

http://thunting.com/geotech/forums/s...ad.php?t=13145

please look mail by leto dated 06.06.2007



regards
Erol