northwest The need for big deep gold detectors.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: The need for big deep gold detectors. 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: The need for big deep gold detectors.  (Read 22579 times)
Muntari
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« Reply #800 on: Wednesday November 7 2018 20:04:36 AEDT PM »

Here is a picture of the bundle versus flat spiral wound coils.

Same inductance on both units.
The depth and noise figures are about the same will post SRF when I get more time.
One interesting thing though is the weight, there is only about 100 grams difference... 590 bundle, 695 spiral



cheers

Muntari


* Concentric flat v bundle size.JPG (105.92 KB, 640x480 - viewed 133 times.)
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WM6
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« Reply #801 on: Thursday November 8 2018 00:35:13 AEDT AM »

  
Here is a picture of the bundle versus flat spiral wound coils.



Hi Muntari

Wrong Photo?

I cannot see flat spiral wound coil on this photo.
Seems both coils are bundle wound.
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Muntari
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« Reply #802 on: Thursday November 8 2018 09:30:16 AEDT AM »

Hi WM6,

The bottom foam pieces hold the spiral coils, I will remove the foam tonight and post a photo.
I should have explained a bit more but was just trying to show size comparison.

Cheers

Muntari
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IBGold
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IBGold at home.


« Reply #803 on: Thursday November 8 2018 16:44:39 AEDT PM »

Hi when we talk coil sizes can we use center-line measurements IE bundle center line and flat wind center-line rather than coil OD.

Regards, Ian. happy face
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Regards, Ian.
Muntari
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« Reply #804 on: Thursday November 8 2018 21:12:17 AEDT PM »

  
Hi when we talk coil sizes can we use center-line measurements IE bundle center line and flat wind center-line rather than coil OD.

Regards, Ian. happy face

Hi Ian,

Yes, sure, why not, save any confusion.. happy face

cheers

Muntari
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Muntari
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« Reply #805 on: Thursday November 8 2018 23:50:01 AEDT PM »

Here is the stripped down spiral and bundle details as promised.
I will give more info once I have completed some more builds and settled on final form, then field tested again.




More later

Cheers

Muntari


* Concentric flat v bundle size_2.JPG (69.99 KB, 640x480 - viewed 69 times.)
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Muntari
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« Reply #806 on: Friday November 9 2018 00:06:13 AEDT AM »

Just a quick note on comparing concentric spiral versus bundle wound.
Enough separation is required between TX inner and RX outer
How much, depends on the size of the RX coil required.

To get the equivalent inductance on spirals requires more turns than a bundle wound
To get equivalent  depth requires a larger diameter receive coil.
To get a bigger receive coil, requires a larger TX coil...

Then you have to balance this with the increased capacitance

No free lunch

Cheers

Muntari
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WM6
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« Reply #807 on: Friday November 9 2018 01:22:55 AEDT AM »

Great! Thank you Muntari.
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Muntari
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« Reply #808 on: Friday November 9 2018 09:49:46 AEDT AM »

  
Great! Thank you Muntari.

No Worries WM6

Btw center line for spiral wound is

TX 407
RX 228

You will notice on the flat former, windings can start an finish further in or out, depending on requirements ...it is my re-usable test bed  for the bench, field test units get fully enclosed and the former is cut to finished size to eliminate as much weight as possible so finish part looks nothing like this.

Cheers

Muntari
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: The need for big deep gold detectors. « previous next »
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