Large vehicle DD coil

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	Re: Large vehicle DD coil « Reply #10 on: March 11, 2018, 01:34:21 pm »

Need to rethink your formula. Parallel Inductance is like parallel resistances.

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Dhooooo Your way works too. LOL

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	Re: Large vehicle DD coil « Reply #11 on: March 11, 2018, 04:28:52 pm »

This is VLF your messing with ?

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	Re: Large vehicle DD coil « Reply #12 on: March 11, 2018, 05:02:33 pm »

Yes. Whites DFX

I think that the parallel connection of the inductance is correct. It is necessary to create an even stream of alternating magnetic field in each of the TX coil areas. This is possible if each coil is supplied with the same current as in the case of a single coil. Energy is given by the formula W = L * i * i / 2 The increase in inductance has little effect on the energy increase and generation of induction flux, and at the same time inductive reactance at 15kHz effectively limits the current that at low supply voltage will never reach a satisfactory value.

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	Re: Large vehicle DD coil « Reply #13 on: March 12, 2018, 02:29:28 pm »

I need a schematic diagram of DFX input circuits with element values.
Does anyone have and can help?
- Thank you in advance

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	Re: Large vehicle DD coil « Reply #14 on: May 13, 2018, 02:05:07 pm »

Hello Krzychu.
I bought a used DFX one month ago for meteorite hunting. I have the 9,5" coil and the super 12" coil.
I was thinking about trying the ultimate 13" that is a favourite by meteorite hunters as I can see.
I can see the biggest coil available for the dfx is the detech SEF 18x15". Meaby you should try such
a coil to check if the dfx can be efficient with a very big coil. I'm a little disapointed about depth on chondrites
meteorites. Did you see any depth improvement with yhe ultimate 13"?

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	Re: Large vehicle DD coil « Reply #15 on: June 03, 2018, 01:06:22 am »

Hey!
For some time I could not answer because I had problems logging in to the forum. I have a 13-inch DeTech Ultimate DD coil and it is very good for areas where maneuvering
even larger coil would be difficult and in some cases even impossible (eg in the forest). I was looking for a "Pultusk" meteorite (H5 chondrite with a large amount of iron). By the way I found a lot of magnetic stones (hot rocks) with weak magnetic properties and low iron content, so chondrites of this type (L) are also "visible". It is very important to properly adjust (GEB) to the ground and manually correct the automatic setting. Larger coils certainly have better ranges for large objects, giving strong signals, but the deeper backlogs, small stone meteors on the ground can be invisible at the time. The coil I will make will be 13 inches and the depth of penetration similar to this dimension, but the detection field will be 40 inches wide. Wink

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	Re: Large vehicle DD coil « Reply #16 on: June 07, 2018, 12:38:28 pm »

Hello krzychu. Thank you for sharing your expérience. I will try manual ground balance as soon as possible. I hope your coil projet Will work fine. Pultusk is famous. In France we have some interesting old météorite strewnfields Wink

Posted on: June 07, 2018, 12:10:18 pm

From what I read on the net, the Whites V3I is deeper than the DFX even on chondrites. Do somebody have any experience with this detector?
I tuned a CZ3D with a 10,5" coil to feel chondrites in discri mode and it's very deeper (at least 30%) than the dfx.

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	Re: Large vehicle DD coil « Reply #17 on: June 07, 2018, 04:42:05 pm »

Hello, Super Pierrot.
Fisher CZ3D has the same frequency as DFX (15 kHz) and is a more powerful detector with high parameter settings. To find a meteorite colleague recommended Fisher Gold Bug II, but I'm not sure if such a high frequency of work (71kHz) can reach the range due to the increasing damping of the electromagnetic wave in the ground. The meteorites are not lying deep. A bigger problem is the separation of chondrites from magnetic stones (hot rocks).The possibility of manual GEB setting is a really advanced option.

As always, the point is to change the pitch of the probe over the ground does not change the audio signal in static mode (AUDIO DISC = OFF).
The procedure should be started from performing automatic compensation (after pressing ENTER, follow the instructions on the screen).
GEB settings that find the detector automatically are usually satisfactory, but if not, go to the COARSE (coarse adjustment) and FINE GEB (fine adjustment) functions.
If the signal decreases when descending - it should be subtracted, and if it decreases, add it. And that's it. The rest is a matter of practice (a few months Cheesy

).
Oh. It should be remembered that the AUTOTRAC function must be turned OFF beforehand, otherwise the detector will adjust itself and change laboriously adjusted GEB settings manually.

Good luck!

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	Re: Large vehicle DD coil « Reply #18 on: June 08, 2018, 12:53:34 am »

Hello. I also have a Fisher GB2 with 6,5"(sold this small coil) 10,5" and 14" coil. The medium 10,5" coil is the best for meteorite hunting. It's very light and stable.
It is not a powerfull detector, it's a sensitive detector but I don't think it's the best for general chondrites detecting. It has little advantages for very specific conditions.
It's a full all metal detector. Discrimination mode is fixed and eliminate hot rocks and all chondrites. In all metal mode, the very fine ground balance with audio boost allow
to detect very small LL or even some eucrites on a difficult medium mineralised ground. The computer is in your head, mixing sound evolution. It's very interesting for
hunting meteorites in very specific conditions. It's certainly one of the best for hunting micro iron meteorites in desert or free junk places.
I think It's not a good option for hunting H meteorites like Pultusk, any detector with tunable discri will better do the job.
However it's a fantastic detector in specific conditions and it's made for prospecting micro gold nuggets. I love it Kiss

For the DFX, I feel it's more efficient on chondrites in 3KHz mode than in best data mode or in 15KHz mode. Low to medium frequencies (3-12 KHz) seems to better do the job for meteorites.
A few tests with the DEUS seems to confirm this idea but I am not crazy about this detector...

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	Re: Large vehicle DD coil « Reply #19 on: June 08, 2018, 02:18:23 am »

Hey!
If it's not a secret - I'm interested in your meteorite programs for DFX. I would like to try them in my soil conditions.

Regards Waveing

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