Findmall.com
 
 






Whites TDI Classroom


Welcome! Log In Register
Tdi pro gb at the beach
Posted by: stephenscool
Date: April 20, 2018 02:31AM
Do any of the pro users gb at a salt water wetsand beach? I want to discriminate by size, shape, and response. Not by hi/lo. I take it will run deeper in straight pi but noisier. Any shared experiences would be great

Re: Tdi pro gb at the beach
Posted by: stephenscool
Date: April 22, 2018 02:45AM
I'll figure it out. Limited time at the beach and don't want to waste time. Better to have an idea of what to expect. Will run straight pi.. find a few deep rounders and then gb and see the results

Re: Tdi pro gb at the beach
Posted by: doc holiday232
Date: April 22, 2018 01:18PM
Stephen I've always heard that no GB is preferable at the beach---your findings will be greatly appreciated.

Re: Tdi pro gb at the beach
Posted by: filternozzle
Date: April 23, 2018 10:22AM
I never GB'd on the wet sand when I used the TDI Pro



Happy Hunting
Minelab: GPX-5000, GPX-4500. Whites Pulse Scan TDI. Nexus: MP, Standard Mk II & Ultima. Nautilus: Silver King, DMC, DMC II, DMC-IIB & DMC IIBa.

Re: Tdi pro gb at the beach
Posted by: sonnar28
Date: April 23, 2018 11:22AM
Quote
stephenscool
Do any of the pro users gb at a salt water wetsand beach? I want to discriminate by size, shape, and response. Not by hi/lo. I take it will run deeper in straight pi but noisier. Any shared experiences would be great

The only time that I use ground balance on the Pro on the saltwater beach is when I am wanting to knock out the high conductor targets, such as when I'm in a coin patch and I really don't want to dig the quarters/dimes/pennies.

Usually a ground balance of about 6.5 will knock out most of the pennies as high conductors while the 10 karat men's class ring stays in as a low conductor. But the price to pay is about 3 to 4 inches of depth loss with ground balance on, using a Miner John 14 inch mono coil with a pulse delay of just a little higher than 10. The Reg modified TDI Pro can usually run a gain of about eight, however the non-Reg modified Pro can only run about 5 to 6 gain with ground balance on. This is my experience on South Carolina and Georgia beaches, which are moderately mineralized at worst.

The reg modified Pro runs just as smoothly with the ground balance on as with the ground balance off/straight PI mode in these conditions. The non-reg modified Pro is noisier with the ground balance on compared to straight PI mode, if you're trying to push the gain for maximum depth. I am sure the results would be somewhat different if I were on a black sand beach.


Charles

Re: Tdi pro gb at the beach
Posted by: doc holiday232
Date: April 23, 2018 11:28AM
Good report Sonnar 28.Thanks.

Re: Tdi pro gb at the beach
Posted by: stephenscool
Date: April 24, 2018 10:13AM
Won't be hunting for a couple months.. somethings come up

Re: Tdi pro gb at the beach
Posted by: Mega
Date: April 25, 2018 02:37AM
Only used the TDI Pro on the beach a few times,as i live so far inland its rare that i go beach detecting,only use the TDI basically for just one main site which was a trading villa site for about 400 years,the ground conditions are about as bad as you can get as the mineral content is just like black sand on a beach.The only machines that reallly work are multi freq machines ie Minelabs etc and Pulse machine,because this site is so prolific coinage wise and still producing even after about 10 years,each turn of the plough brings up new find.

Normal use on specific sites i would run with GB on and on low conductivity,but when i suspect the possibility of a deep artifact then the GB is turned off

avatar
Re: Tdi pro gb at the beach
Posted by: lytle78
Date: June 08, 2018 03:42PM
All the work Eric Foster and Reg Sniff did to make the TDI as flexible and useful as it is has given us a great tool. Sadly, as far as Whites goes, it seems to be a dead end.

In 2016 there was a very interesting exchange on the Geotech forum run by Carl Moreland. A guy writing as Asgard posted about his work to carry further the basic PI approach which Eric launched. Here’s a snip - have a read and then I will continue the story...

May 7, 2016 - Asgard writes to Eric Foster...

“I'm happy to finally talk to you, I have spent the past 10 years analyzing your work, I did a great job of retro engineering, I completely rebuilt the following models GoldQuest ssv 3 aquastar DeepStar 3 (last model Sami aquastar) goldscan 5B and 5C, some differences between versions of goldscan, which finally gave the TDI but that is far worse than your last goldscan 5C exit of your factory.

Meanwhile, I changed many things in your detectors principes, I added PIC32MZ type of microcontroleurs for timing, I think you have to improve substantially the analog part, we are doing a lot of extra things with digital .

Unfortunately although the results is exeptional, a new technology consumes me much mind! I continue to develop models (not commercial) and repair your metal detector and upgrade, I think by having seen more than a hundred of all kinds worldwide.

It is unfortunate that you are completely stopped and forsaken the patterns of goldscan at "White's" I would dream to take your job .... Now that Carl has left nobody continue your work ...

Without wishing to boast, and Isay something before it is sure, I think I'm the only one resumed and continued your work since your absence ...

Too bad....

Alexandre/i]

We now know that this was Alexandre Tartar, who had been studying PI detectors for almost 10 years. Kindly excuse the rather bombastic tone as due to English being a foreign language for Alexandre - who is French.

A week later, he published in another thread on Geotech a sort of manifesto about his machine - the Aquamanta. This device is the result of (according to Alexandre) of 10 years and 15,000 hours of study, design and development. Carl Moreland, who as Engineering Manager at Whites, brought the TDI to market and who was then (and now) Engineering manager at First Texas, noted itAlexandre’s post and followed up on it. He has recently posted what happened next, basically saying that he challenged Alexandre to demonstrate what he claimed. A prototype Manta was sent to FT and the result of their evaluation was that FT acquired the whole thing - technology and rights, plus hiring Alexandre and his team.

Since that happened a bit over a year ago, rapid development has occurred and the mechanical design has been done. Now engineering testing prototypes will be built, testing will be done and hopefully, a production Fisher Beach PI will emerge.

From information posted on various forums, it is clear that this a a GOLD HUNTER - totally optimized for finding gold in sea water. Quiet. powerful and sensitive to the small and low allow gold which no previous detector is good at finding in salt water.

If you haven’t guessed - I can’t wait



Rick Kempf


Re: Tdi pro gb at the beach
Posted by: stephenscool
Date: June 08, 2018 11:25PM
Looking forward to it Rick.. on a side note as most Asian jewellery is 24k is there a "manta" setting that will only detect 24k and iron? For every 10 24k I find I might find 1 18k, usually on average 0.1ct diamond in it

Perhaps this could be a method of double checking a target prior to digging?

Hunt in disc mode against 24k/iron. Hit a target and switch modes so it only hits on 24k/iron. If the original target still hits it's likely gold mixed with alloy metal.. aka 10k~18k



Edited 1 time(s). Last edit at 06/08/2018 11:28PM by stephenscool.

Re: Tdi pro gb at the beach
Posted by: cjc
Date: September 14, 2018 06:31PM
This is something I|'ve worked at testing for a few years. Its not the ground so much as the surge of salt water going past the coil--the faster the les stability. Kind o a shame that will all that fidelity and power, a good old DF handles these condtions better. The alternative is the take the Pro way down--Gain 10:00 o'clock, Delay almost 2--DF depth. GB also needs a very low Gain and gives these wide flat responses. This detector does have salt water potential but seems best suited to very calm seas. A real ordeal tuning it and when all is said and done-depth-the reason you started is reduced. Still working on it. In fresh ir runs at some good levels but loves those pins.
cjc

Sorry, only registered users may post in this forum.

Click here to login