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TDI PRO
- Thread starter 3tone
- Start date
I had a TDI=S with a 12'' duel field coil it was no good on small gold i use a mall test nuget
to test with, tdi-s with 12'' coil would not detect it.my vlf troy with 7'' coil,detected it at 2''
I have a expermantal 7'' coil that i made for my piranha pi works at 4-mh restance.the
TDI-S with that coil detected my test nuget a 4 -1/2'' and some powder gold a about 1''..
Dont know about the 5'' round coil.it depends on who makes the coil.
I also tried minelab coils they work,not very good
Maybe some one will let you know.
Your TDI-pro how well doe it DIS- ferrous and non-ferrous.
to test with, tdi-s with 12'' coil would not detect it.my vlf troy with 7'' coil,detected it at 2''
I have a expermantal 7'' coil that i made for my piranha pi works at 4-mh restance.the
TDI-S with that coil detected my test nuget a 4 -1/2'' and some powder gold a about 1''..
Dont know about the 5'' round coil.it depends on who makes the coil.
I also tried minelab coils they work,not very good
Maybe some one will let you know.
Your TDI-pro how well doe it DIS- ferrous and non-ferrous.
Tone, after you cheched the TDI-Pro out. I might trade you a New
Minelab Eureka Gold detector for it, its still under warrenty i never used it.
I live in Florida not going out west this year there are no nugets here.
Check the TDI-pro out good,if you dont like it let know. my E-mail
fjs5015@yahoo.com
Frank
Minelab Eureka Gold detector for it, its still under warrenty i never used it.
I live in Florida not going out west this year there are no nugets here.
Check the TDI-pro out good,if you dont like it let know. my E-mail
fjs5015@yahoo.com
Frank
There is no commercially available PI detector which will normally signal on gold much below 0.1 grams in weight. I have tried a Minelab 2100, a TDI and a Garret ATX on a 14kt gold bead weighing 0.1 grams with a diameter of .01 " and none of them get it with coils down to 8" in diameter. The issue is probably pulse delay. To,get tiny gold you need a delay in the vicinity of 8μsec. The only PI detectors which claim micro gold capability seem to be the GPX-5000 - then only in special modes and the as yet unreleased SDC-2300 which no,one other than Mixnelab,s hand picked testers have used.
VLF detectors optimized for gold pick up this bead easily at air test distances of from 1" - 4". With these of course, You have the issue of hot rocks and loss if depth in highly mineralized ground.
My opinion only.
VLF detectors optimized for gold pick up this bead easily at air test distances of from 1" - 4". With these of course, You have the issue of hot rocks and loss if depth in highly mineralized ground.
My opinion only.
Do a search for Reg,s posts on this subject. He has written extensively about it. If you're not curious enough to do that, there's no point in going into it all again to satisfy your limited curiosity. No PI detector offers iron discrimination as good as the simplest BLF has.
Sven
Well-known member
Will throw this out there only because I have built my own PI's and have built a bunch of different coils that work wonderfully.
You will need to get the Pulse delay below 10us. Have the Pulse width down to 12us, lower the SAT to allow the detector to sample a target longer along with a slower
coil sweep speed. Fast coil. EMI free environment.
I love my 5" mono coil, goes almost as deep as my 7". And is very good at picking up small nuggets to about 4". Haven't been able to get it to pick up gold dust in a tiny vial.
I have tried several other small mono shapes ovals, triangle but, they fall short compared to the round coil on tiny gold, excellent for coin hunting. I just wound up two 4x12" rectangular mono coils because of a discussion on Geotech. It did appear to work similar on the bench to the 5" round coils depth wise and still get a double blip on nails. Did notice on small gold it was a tad more sensitive and a slightly better report when waving the small nugget across at 4". I have yet to finish the coil to actually go out and field test it. I will add that when I wound up smaller rectangular mono coils 2x5". They were terrible, the narrowness of the coil, lost the nails double blip signal and lack of depth. They were built using 2:1 length to width ratio.
The 4x12 are built using the 3:1 ratio.
I am currently using 24guage 19 strand silver tinned, teflon jacketed wire. Nylon spiral wrap, and copper foil shielding.
Finished coils are as close to 300uh as possible, 1.6 ohm resistance. These are measured at the wires coming directly from the coil.
Also from my experiments coils smaller than 5", tend to lack in depth and performance. For my PI, the 5" was the smallest magical diameter.
You will need to get the Pulse delay below 10us. Have the Pulse width down to 12us, lower the SAT to allow the detector to sample a target longer along with a slower
coil sweep speed. Fast coil. EMI free environment.
I love my 5" mono coil, goes almost as deep as my 7". And is very good at picking up small nuggets to about 4". Haven't been able to get it to pick up gold dust in a tiny vial.
I have tried several other small mono shapes ovals, triangle but, they fall short compared to the round coil on tiny gold, excellent for coin hunting. I just wound up two 4x12" rectangular mono coils because of a discussion on Geotech. It did appear to work similar on the bench to the 5" round coils depth wise and still get a double blip on nails. Did notice on small gold it was a tad more sensitive and a slightly better report when waving the small nugget across at 4". I have yet to finish the coil to actually go out and field test it. I will add that when I wound up smaller rectangular mono coils 2x5". They were terrible, the narrowness of the coil, lost the nails double blip signal and lack of depth. They were built using 2:1 length to width ratio.
The 4x12 are built using the 3:1 ratio.
I am currently using 24guage 19 strand silver tinned, teflon jacketed wire. Nylon spiral wrap, and copper foil shielding.
Finished coils are as close to 300uh as possible, 1.6 ohm resistance. These are measured at the wires coming directly from the coil.
Also from my experiments coils smaller than 5", tend to lack in depth and performance. For my PI, the 5" was the smallest magical diameter.