Idea

[Mark-VA]

I know this would work but here goes.
The nice feature of the TDI is the conductivity switch and how you can reject certain metals from high to low.
Why not make an adjustments to where the low-high takes place without adjusting the ground balance.
This could by easily done through digital programing but not sure the TDI has the available electronics.

Maybe an adjusting pot tied to the switch to include or exclude the upper or lower portion of the switch setting.

At present with the ground balance set to 7 1/2 the breaking point between high and low conductors might be:
A pull tab and below gives a high tone (low conductor)
Just above the pull tab gives a low tone (high conductor)

Make an adjustment to change where the low tone starts at a level below the pull tab without adjusting the GB.

[Carl-NC]

The GB point IS the conductivity break point. You can't separate them.

[Mark-VA]

I know the gb is the breaking point. I guess I didn't explain enough. I'll add more tonight

[Mark-VA]

So you're saying, with the conductivity switch set to low, the only way to adjust the breaking point between high and low conductors is to adjust the GB. That is how I also understand the function of the switch. But I was wondering if there might be another way, most likely never discovered. But of course if it was discovered someone would have already used it. Thought some of the minelab technology might just be using something similar to provide a better form of discrimination over the TDI.
Actually what brought this on was the video of a French detector.

https://www.youtube.com/watch?v=tz2PEunAtec

After watching the video I knew my TDI could provide the same type of results.

https://www.youtube.com/watch?v=tz2PEunAtec

[Carl-NC]

You posted the same link twice. I assume the 'Manta is the French detector, it doesn't have GB. Instead, it has adjustable disc. In general, you can have GB, or you can have an adjustable disc break point, but not both at the same time. This is for classic single pulse designs.

[Mark-VA]

Sorry about the link, this is the one I was talking about.

https://www.youtube.com/watch?v=G8sd...be&app=desktop

So are you saying the French machine is not really anything new?

Thanks for the info on the Manta.

You most likely don't remember, but years ago I sent you a soil sample of these areas to test. As a final note, between the guys I hunt with and myself we have used some of the best VLF machine on the market. These include the V3i, DFX, XLT, Fisher gold bug, F5, F75, Minelab explorer, etrac, CTX 3030, Deus and this doesn't include the lower end machines. This is what prompted me to purchase the TDI SL. And I can say, I've dug more silver (sadly to say nails too) and gold from these area with the SL. Only recently I pursued gold hunting exclusively with the conductivity switch set to low and it's paying off.

This is actually what I'm waiting for............

http://www.detectorprospector.com/fo...ng-technology/

"First detector birthed from this platform is a gold unit priced around $1000, but deeper than current VLF, this detector will also see through red dirt, and highly mineralized soil."

If this comes true my TDI would be sold for sure......or rather be my beach and backup machine.

[Ferric Toes]

Along with assisting in the the TDi for Whites, I did an additional development for a PI detector with proportional timing i.e. the clock frequency control adjusted the TX pulse width, TX frequency, delays, and sample widths all in proportion to one another. I expect Carl remembers this, as I brought the prototype to Whites on one occasion. It did not quite match the TDi for detection range due to the low power transmitter that was employed, but it did have one unusual feature and that was once ground balanced, you could adjust the delay over quite a wide range without having to re-balance the ground signal. In view of the original question about separating the magnetic viscosity signal from the conductivity response, this appears to be a way of doing it.

Eric.

[daverave]

So you're saying, with the conductivity switch set to low, the only way to adjust the breaking point between high and low conductors is to adjust the GB. That is how I also understand the function of the switch. But I was wondering if there might be another way, most likely never discovered. But of course if it was discovered someone would have already used it. Thought some of the minelab technology might just be using something similar to provide a better form of discrimination over the TDI.
Actually what brought this on was the video of a French detector.

https://www.youtube.com/watch?v=tz2PEunAtec

After watching the video I knew my TDI could provide the same type of results.

https://www.youtube.com/watch?v=tz2PEunAtec

i also watched the video of the french designer where he demonstrated how his detector could see a gold ring with two nails above it...i also saw a video of someone with a white's tdi who again demonstrated the detec
tor could find a gold ring with two nails on top of it...my thoughts were that maybe the french designer has found a way by using a pic mic
roprocessor to do the same as the whites tdi....i think maybe the french guy got his basic idea from the GS5/TDI.
I saw a pic microcontroller in his latest iron rejecting pulse machine.

[Mark-VA]

ferric toes
I tried to send you a message and the system says you're out of space.

[Carl-NC]

The Manta does some clever tricks that negate its ability to truly GB, but it's a beach detector not a prospecting detector. Can't say much more about it because it's an unreleased product.

Eric, you're right about proportional timing. It's possible that it will cause an effect with conductivity even though ground remains balanced.

[daverave]

The Manta does some clever tricks that negate its ability to truly GB, but it's a beach detector not a prospecting detector. Can't say much more about it because it's an unreleased product.

Eric, you're right about proportional timing. It's possible that it will cause an effect with conductivity even though ground remains balanced.

Hi Carl...i saw two video's where the french guy demonstrates two detectors...one was the manta which has no iron discrimination and the other a iron rejecting pulse detector using a stamp shaped pic microprocessor.

[daverave]

i feel sometimes im invisible on this site as no replies to some of my comments...maybe my comments hidden from view for some reason...makes me feel very depressed and dispondant.

[Qiaozhi]

i feel sometimes im invisible on this site as no replies to some of my comments...maybe my comments hidden from view for some reason...makes me feel very depressed and dispondant.

Can you post the link to the iron rejecting pulse detector?

[kt315]

yup. adverts again. something forgotten and emerges as completely new.

http://www.geotech1.com/forums/showt...p?20661-Manta-!!
http://www.geotech1.com/forums/showt...Metal-Detector

[daverave]

kt 315 has provided a link showing the aquamanta A1 rejecting iron...the other video i saw was the white's tdi which rejects the nails and still finds the gold ring https://www.youtube.com/watch?v=tz2P...05765292153228