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Question:
A gadget or not?  (Voting closed: August 19, 2012, 11:05:54 am)
It's a gadget don't touch - 3 (60%)
It's’ the best man ever made - 0 (0%)
Not sure - 2 (40%)
Total Voters: 5

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Offline GoldDigger1950
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« Reply #10 on: August 10, 2012, 08:25:56 am »
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Quote:Posted by BitburgAggie_7377
Could one of you technical folks explain to me in simple terms that my layman brain can wrap itself around why you can't have two separate systems with separate boards in the same housing, especially when you have a toggle switch to determine which of the two systems get's the juice?

There are some things that need to be overcome but there is no reason for not doing it except for excess weight and necessary complexity. I say necessary for obvious reasons. The first company to put VLF and TR technology together was Gardiner (to my knowledge) and their machine was imitated, but not copied, by all the other manufacturers. Whites and Garrett were the first to follow suit with VLF/TR machines and then everyone had one. Fortunately, the BFO was left behind and inferior technology.

A couple of things come to mind in this combination of technologies. One is that a PI coil normally has Faraday shielding to keep out stray EMF such as one might expect from using it near an ultrasonic fence field from a burglar alarm. Those can jam up a bare coil making the machine useless. A Faraday shield that allows a PI to work would cripple a VLF/TR machine. That's something that the designers need to overcome.

Impossible? Not at all. Complex? Yes, but necessarily so. Practical? The weight makes it very, very low on my priority list. Now, if you made it modular, where you slipped a brick type of PI module out and inserted the VLF/TR one, that would be more to my liking.

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« Reply #11 on: August 10, 2012, 08:43:09 am »
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Personally I don't think I would want a machine like that. Weight alone is a turn off for me but do see where it has a place in the hobby

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« Reply #12 on: August 10, 2012, 01:19:41 pm »
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just another point i'd like to add  :Smiley ..if its got mutli-coils wouldn't a larger PI coil (c.10") induce a large current in the VLF receiver coil  (c.6").. which could fry some of the components in the circuit over a period of time? i'm thinking the flyback voltage through the 20-30 turns on the PI would produce a large current through the much lower impedance/ fewer turns coil .. i'm sure something would go pop ... i'd probably be wary of its life expectancy? whats your views on this? ..

Or maybe you have to use separate coils for each configuration? and that would be a ball ache in the field. Angry

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« Reply #13 on: August 11, 2012, 01:57:27 pm »
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The way that I see it is that the two machines would work independently and yes the PI would induce a voltage in the coil of the VLF but because it's switched off (And probably the coil too) there would be no interference to the VLF how ever on a VLF coil you have in the region of 100 turns of wire and even if it is 0.25mm that 100 turns is quite a mass of wire. This in my opinion would have an effect on the PI unless they some how use that coil (VLF) as a pick up coil for the PI, as you know you can have a PI with a TX coil and a RX coil GD would be the one that could answer this better but if I were to build and dual machine like this I would attempt to use the VLF coil as a pick up coil for the PI (killing two birds with one stone)

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« Reply #14 on: August 12, 2012, 11:44:33 am »
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that sounds plausible   Cool but i would still worry about interference and loss of sensitivity  Huh?  suppose the only way to test it is to build our ouwn and see what is the best configuration  Grin

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« Reply #15 on: August 12, 2012, 01:06:06 pm »
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Mate I reckon that the guys that put this thing together are bold  Grin and if they weren't they are now   

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« Reply #16 on: August 12, 2012, 04:23:26 pm »
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i Agree  Cheesy Grin Grin Grin bold or just testing the market to see how much attention a dual type machine gets  Shocked could be worth the development costs if you could get it to work without loss of sensitivity and manage to get the depth and discrimination  ...


i would like one that performs both at the same time .. but there would be frequency clashes and all sorts of problems associated to it  Sad

i congratulate them for at least trying, but i'd not like to be the one trying  Grin (well i might secretly  Wink)

Posted on: August 12, 2012, 04:22:54 PM
Actually i could do with a Job  Cool

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« Reply #17 on: August 12, 2012, 04:33:42 pm »
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The Soul machine may work but it will not Work like a VLF or PI Detector will.


It will NOT be as deep as a PI can be.

It will Not be as Sensitive a A VLF can be.

You can not Combine like the two Coils And Get the Same.

They just Are Not THE same Tech.


You Can't grow Oranges on Apple Trees!

You Can grow Oranges, Lemons , limes, Grape Fruit on the Same Tree!   I HAD one.  

I had a tree that was Graphed and had it all.

The Route was the same.

The two machines are different.




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« Last Edit: August 12, 2012, 04:42:59 pm by homefire »
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Offline GoldDigger1950
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« Reply #18 on: August 12, 2012, 08:36:50 pm »
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Quote:Posted by xavier
I were to build and dual machine like this I would attempt to use the VLF coil as a pick up coil for the PI (killing two birds with one stone)

That would be the only way to accomplish the task. The TX coil would also have to reside inside of the RX coil and be smaller.

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« Reply #19 on: August 13, 2012, 12:02:13 am »
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At this time I am not sure what to believe about this metal detector  Idea it all sounds brilliant, and if they have got it right, we will hear a lot about it in the future  Great Wow, but that price is a killer  No no!

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