build coils 4 tesoro sand shark

[gabrieljuglar]

hi guys!!! i hope you have a nice time!!!!! i am lookin for some help to built by my self some coils for my tesoro sand shark.( is a pulse induction unit workin at 660 pulses per sec) the size of the coils i want to build are these: 30 inch 40 inch and the biggest 80 inch. i am gratefull for any help that you can giveme!!!!!


seeya!!!!

[gabrieljuglar]

no the pulses are 600 per second .....

[Carl-NC]

Mostly just keep your inductance around 350uH regardless of size.

[kt315]

Tesoro
Name TX-L TX-R (ohms) TX-fo TX wire RX-L RX-R (ohms) RX-fo RX wire
________________________________________

Sandshark 8" 358uH 11.0 --- ---
Sandshark 10" 358uH 11.0 --- ---
Sandshark 5x10 357uH 7.38 --- ---

[gabrieljuglar]

guys, what diameter of enamelled cooper wire do you sugestme......
i want to build 1x1 meter coil for maximum depth (on big objects, of course.......)

[gabrieljuglar]

i want to build a 30 inch or 40 inch for my sand shark!!! someone has already done??? i need tips!!! some help

[gabrieljuglar]

how is the best way to measure the inductance in this kind of coil?????

[peroon]

Use inductance meter.

[gabrieljuglar]

hey friends the atachment for the sand shark is just a conector with two pins , so my question is if this dont have any kind of shield or so.... if the construction of the coil is just make the turns and keep the inductance in the sugested level? ... is this going to work?....dont matter the wire used if the inductance is keeped at that level? is there any risk that my machine could be damaged?? guru!!!!!!!
guru!!!! bless me with your knowledge!!!! i need some extra depth!!!!!!
greetings seeeya!!!!

[gabrieljuglar]

hey the only matter in the construction of coils for the sand shark is keeping the inductance at 358 uh? whats about the diameter of the wire? whats about the number of turns? i sould find these values by trying? winding and measuring? i have found this machine is incredible sensitive to gold but i want get more depth for hunting for big caches( and deep) of gold... i wish built an 30x 30 inch coil for reaching something like a meter and a half or two meters .... i want inv¡te tesoro sand shark owners to helpme develope such big coils, very sensitive to caches and big and deep nuggets!!!!!

[gabrieljuglar]

hey gurus i need some help i need some extra depth!!!!!!!!! if someone could helpme could be great!!!!

[grungymike]

deeper, harder, longer, etc...

From what I've read about PI units, in order to increase detection depth you need to strengthen the xmt pulse by widening the xmt pulse width.
The tradeoff is a slower pulse decay, requiring the 1st sample pulse to be pulled out further on the timeline. This will reduce sensitivity to smaller targets.

bbsailor's excellent article on fast coil design discusses the tradeoffs, as well as Reg Sniff's article on PI design.

Just like juggling hand grenades, it's all a balancing act...

[gabrieljuglar]

hey guys the fact is that i bought the sand shark but now i am looking for more depth and i am some novice in the matter of modifying the metal detector... hey i have a gold century gc 1016A and i would like to know the way to build a bigger coil cause this machine works at 6 khz and with a big coil i can get more depth.... iam hunting for big caches....