- Jan 3, 2007
- 756
- 716
- Detector(s) used
- ML SDC-2300, Fisher F-75, XP Deus,
- Primary Interest:
- All Treasure Hunting
I started a thread a couple of weeks ago about the French PI development by a guy named Alexandre Tartar — which has been picked up by First Texas (Fisher). I should have been clearer about one thing - the detector prototype called Manta is designed for the beach. Inland use would be a completely different application and the Manta may or may not be able to be developed in that direction.
There were a number of posts from folks here on the form. The general drift was the PI's don't discriminate reliably - and when people have tried to use discrimination in PI's either the total detection depth was reduced to no better than a VLF, or the discrimination itself was not reliable at depth. These comments I believe were spot on as far as they relate to what we have seen so far with things like Minelab's iron ID on the GPX series (limited to shallow targets) and the ability of the TDI to use its ground balance control as a form of discrimination iron (with noticable loss of detection depth).
I subsequently found another Manta video — it's fairly long — 20 minutes — and of course it's in French, but in spite of that I've watched it at least a half dozen times.
In the video they demonstrate a Manta prototype (not the latest one, Manta 3) demonstrating various capabilities. Among these capabilities are:
All metal mode — responding to iron nails, black volcanic sand (from the Canary Islands and from La Reunion) and a plain gold ring
Iron discrimination mode using multi tones - low for iron and black sand, high for gold ring
Iron exclusion - no tone (or a slight Peep) on iron and black sand - solid hit on ring
They then go through a series of demos where they put crossed nails on top of the ring and get solid hits in both discrimination modes.
They then go on to do the same sort of thing with the bags of volcanic sand and with sand plus the nails over the ring. Solid hits on the ring in every case.
a Soverign and a CTX are put to the same targets and the ring is masked by the sand and by the nails.
Buried shallow targets are demonstrated, then deep ones - a gold coin and a large gold man's ring. The latter is put down 16" and gives a solid signal with iron exclusion turned on.
None of this proves anything, I can think of several tests I would have liked to have seen. In addition, this is not a product, but a prototype. What an eventual PI beach detector from Fisher will do (if it ever arrives) is another matter.
I saw no obvious trickery and my contact at FT tells me he saw the Manta do all this at a beach in France - they must have been impressed, they hired the guy.
here's the link.
https://m.youtube.com/watch?v=G8sdp4RG73g&feature=youtu.be
There were a number of posts from folks here on the form. The general drift was the PI's don't discriminate reliably - and when people have tried to use discrimination in PI's either the total detection depth was reduced to no better than a VLF, or the discrimination itself was not reliable at depth. These comments I believe were spot on as far as they relate to what we have seen so far with things like Minelab's iron ID on the GPX series (limited to shallow targets) and the ability of the TDI to use its ground balance control as a form of discrimination iron (with noticable loss of detection depth).
I subsequently found another Manta video — it's fairly long — 20 minutes — and of course it's in French, but in spite of that I've watched it at least a half dozen times.
In the video they demonstrate a Manta prototype (not the latest one, Manta 3) demonstrating various capabilities. Among these capabilities are:
All metal mode — responding to iron nails, black volcanic sand (from the Canary Islands and from La Reunion) and a plain gold ring
Iron discrimination mode using multi tones - low for iron and black sand, high for gold ring
Iron exclusion - no tone (or a slight Peep) on iron and black sand - solid hit on ring
They then go through a series of demos where they put crossed nails on top of the ring and get solid hits in both discrimination modes.
They then go on to do the same sort of thing with the bags of volcanic sand and with sand plus the nails over the ring. Solid hits on the ring in every case.
a Soverign and a CTX are put to the same targets and the ring is masked by the sand and by the nails.
Buried shallow targets are demonstrated, then deep ones - a gold coin and a large gold man's ring. The latter is put down 16" and gives a solid signal with iron exclusion turned on.
None of this proves anything, I can think of several tests I would have liked to have seen. In addition, this is not a product, but a prototype. What an eventual PI beach detector from Fisher will do (if it ever arrives) is another matter.
I saw no obvious trickery and my contact at FT tells me he saw the Manta do all this at a beach in France - they must have been impressed, they hired the guy.
here's the link.
https://m.youtube.com/watch?v=G8sdp4RG73g&feature=youtu.be
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