TESORO GOLDEN SABRE

[ivconic]

Hi Guys

i am lookng for MD about $1000 to $3000 in price
i want you advices of very deep and very discrimnte for single coin
and hoard coins i will thank u to much if you recomment me to best type
and sorry for my poor english

thank u

What's that got to do with this subject here? You should post that question somewhere else.

[hot lady]

MD

Hi Guys

i am lookng for MD about $1000 to $3000 in price
i want you advices of very deep and very discrimnte for single coin
and hoard coins i will thank u to much if you recomment me to best type
and sorry for my poor english

thank u

[GeorgeGW]

No,no. Coils from 20 to 28cm are most suitable for any kind of searching. TGSL works excellent with 22cm DD coil and also excellent with 27cm coil.
What you have to do now is to try to make best possible coil for it. If you can't get 30cm in air on 1e coin, and at the same time total rejection of ferrite rod and 100% stability...than your coil is not exactly good.
If you made 6mh and 6.5mH coils with 0.27/0.28 resin wire (0.25mm without resin) than caps in TX/RX are not exactly precise. Either experiment with caps (22,220nf in TX and 15nf in RX) either make another coil with 5.8mH and 6.2-6.3mH. You must experiment a bit to get best results. I made many coils so far. Each next was a bit better from previous one. Differences are in small details. Very small details. And most important moment is proper nulling.
A little bit of practice you need. Experiment. PCB now looks ok, it must be good (as i can see from photo).
Regards!

P.S.
I do not suggest larger coils...at least not over 27cm. You will not achieve more sensibility on 1e coin and also you will loose some stabillity with TGSL.

i appreciate for your help ivconic and i will make a new one with the same things and values when i will find the time
George

[ivconic]

No,no. Coils from 20 to 28cm are most suitable for any kind of searching. TGSL works excellent with 22cm DD coil and also excellent with 27cm coil.
What you have to do now is to try to make best possible coil for it. If you can't get 30cm in air on 1e coin, and at the same time total rejection of ferrite rod and 100% stability...than your coil is not exactly good.
If you made 6mh and 6.5mH coils with 0.27/0.28 resin wire (0.25mm without resin) than caps in TX/RX are not exactly precise. Either experiment with caps (22,220nf in TX and 15nf in RX) either make another coil with 5.8mH and 6.2-6.3mH. You must experiment a bit to get best results. I made many coils so far. Each next was a bit better from previous one. Differences are in small details. Very small details. And most important moment is proper nulling.
A little bit of practice you need. Experiment. PCB now looks ok, it must be good (as i can see from photo).
Regards!

P.S.
I do not suggest larger coils...at least not over 27cm. You will not achieve more sensibility on 1e coin and also you will loose some stabillity with TGSL.

[GeorgeGW]

I will try with bigger coils with the same prices of L in TX and RX or with OO coil, or one better DD

[ivconic]

Good...progress. But it must be better. Now be patient and try to adjust coils better. With a bit more effrot you will gain better results.

[GeorgeGW]

Hi ivconic new results!!! the detector one 2euro coin it detects it in 20cm distance in the air with a little testing adjustments with ground balance only..

[GeorgeGW]

ivconic, for testing i use this old cable from pc keyboard... but also this it have 5 smaller inside and a shield with foil and fence arround... The helical style of cable is not suitable for outside?? i have and a cable from newest keyboard ( in photo ) with 4 smaller inside and shield...

This metal round case 10cm diameter is detecting on 50cm in the air, without adjust, only with ground balance adjustment with ferrite rod.
if i constuct a bigger coil with the same inductance in TX and RX the results will be better???

[ivconic]

Hi Ivconic

Your diagram is interesting. I always assumed that the transmit and receive cores in the cable needed to be screened from each other to prevent capacitive coupling between them, but maybe it isn't important after all (I'm still learning about this stuff). If one overall screen is good enough, it makes it a lot easier to find suitable cable. Does anyone have experience of using cable with one screen compared to cable with separate screening for Tx and Rx cores? Or is it unimportant?

Gwil

Not the case at all coils i have been seen so far. I checked at original Tesoro coil and it is like on my draw. So i am right.
Similar (if not the same) cable was used at many White's coils, Cscope coils, at some Fisher coils etc...etc..etc..
Case you are mentioning i meet at Minelab coils mostly.

[Gwil]

Cable screening

Hi Ivconic

Your diagram is interesting. I always assumed that the transmit and receive cores in the cable needed to be screened from each other to prevent capacitive coupling between them, but maybe it isn't important after all (I'm still learning about this stuff). If one overall screen is good enough, it makes it a lot easier to find suitable cable. Does anyone have experience of using cable with one screen compared to cable with separate screening for Tx and Rx cores? Or is it unimportant?

Gwil

[ivconic]

Proper cable looks like this;

[ivconic]

George correct me if i am wrong; but this cable you took from keyboard? Right?
That cable is maybe good for table testing but not good for outdoor. You better replace it with something more sutiable.

[ivconic]

Hi ivonic test video eldorado.but I want to make your circuit,Can you give files ???
thanks

http://www.youtube.com/watch?v=awoPmfJazvo

http://img258.imageshack.us/img258/9691/brgeldorado.png

Here are my files! Those are accurate and workable! Working excellent!

http://www.geotech1.com/forums/showthread.php?t=14898&highlight=eldorado

[ivconic]

ivconic good results!!!!!!! TGS is working perfect!!! thanks for your help
this is the last construction for 2009 !!

Excellent!
Perform some air tests and inform us here!

[GeorgeGW]

ivconic good results!!!!!!! TGS is working perfect!!! thanks for your help



this is the last construction for 2009 !!