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 (Moderator: Goldman)  |  Topic: The need for big deep gold detectors. 0 Members and 2 Guests are viewing this topic. « previous next »
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Author Topic: The need for big deep gold detectors.  (Read 28577 times)
Alex
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« Reply #760 on: Tuesday May 1 2018 20:32:33 AEST PM »

Thankyou. Aziz.I appreciate your reply ,with what your dealing with at the moment.  I have been confused with that for a while ,it didn't make sense.  My inductance meter wont measure at that low frequency.so ill calculate coax and measure coil separately.
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Aziz
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« Reply #761 on: Wednesday May 2 2018 19:05:04 AEST PM »

  
Thankyou. Aziz.I appreciate your reply ,with what your dealing with at the moment.  I have been confused with that for a while ,it didn't make sense.  My inductance meter wont measure at that low frequency.so ill calculate coax and measure coil separately.

Hi Alex,

you can do a simple measurement test. Connect a small capacitor (100 pF) parallel across the coil and measure its inductance.
The measured inductance will be higher without the parallel capacitor.
The coax cable does add a huge capacitance across the coil.

The inductance of the coax cable can be easily calculated.
see here   
The inductance of the coax cable should be around 1-2 µH or less.
But not as much as you thought.

Cheers,
Aziz
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Muntari
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« Reply #762 on: Tuesday May 8 2018 10:54:58 AEST AM »

Hi All,

I came across this interesting read on simplifying the choice of Litz wire construction.

[urlhttp://web.mit.edu/ryz/www/pdf/simplitz_apec2014.pdf][/url]

Cheers

Muntari
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IBGold
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« Reply #763 on: Friday June 15 2018 16:14:48 AEST PM »

  
Hi all,

Jeff fine I had the Right one done 13 years ago now for the left one only this one is a bit more problematical but once done should be fine and I know all about the rehab.
 
Attached find a picture of my latest Mono spider coil I am hoping to get it finished before my opp.

Regards, Ian. happy face



Hi all I am back starting to be able to use the arm again and have now finished this coil final details are.
Mono spider coil.
20 turns of 150/38 litz wire.
Turns spacing 5 mm former 10 mm thick rebated 2 mm deep 1.6 mm wide to take the winding both sides.
Coil to shield capacitance.   = 106.2 pf.
SRF shield in place but not connected.   = 695 KHz.
Coax 1400 mm long.       = 100 pf.
Finished Inductance.   = 295 uh.
Finished resistance.    = 0.48 ohms.
Finished SRF.         = 552 KHz.

the Litz RX coil is ready for shielding will do that in the next few days. 

Regards, Ian. happy face


* TX spider coil 002.JPG (34.76 KB, 448x336 - viewed 301 times.)
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Regards, Ian.
6666
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« Reply #764 on: Sunday June 17 2018 14:04:02 AEST PM »

I am curious as to what will be the bench mark for seeing improvement over current coils ?
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IBGold
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« Reply #765 on: Sunday June 17 2018 15:57:45 AEST PM »

Testing against an 18' Elite flat wound Mono first up.

Regards, Ian. happy face
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Regards, Ian.
Muntari
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« Reply #766 on: Monday June 18 2018 09:54:18 AEST AM »

Hi Ian,

Good to hear you are up and about again.

I've been snowed under with work and been out in the paddocks while weather is good and not had much time for the coil project lately.
Everything is ready to assemble and test, just have to find time to do it now.

The coil comparison sounds like a plan.


cheers

Muntari
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IBGold
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« Reply #767 on: Monday June 18 2018 16:43:34 AEST PM »

Hi Muntari,

Check your email I emailed you last week.

Regards, Ian. happy face
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Regards, Ian.
Eski
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« Reply #768 on: Monday June 18 2018 17:05:34 AEST PM »

HEy Ian, will you put some final pics of the coil before you test?
 reason i ask is i want to start winding some project coils inc something like this but need to get setup - it would be better if i had an idea what i would need and i think it would be helpful to see your finish coil.
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IBGold
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« Reply #769 on: Tuesday June 19 2018 16:19:06 AEST PM »

Hi Eski,

I will compile a series of shots that should give you some pointers tomorrow.

Regards, Ian. happy face
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Regards, Ian.
Eski
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« Reply #770 on: Tuesday June 19 2018 20:12:56 AEST PM »

cheers Ian , that is awesome.!
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IBGold
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« Reply #771 on: Wednesday June 20 2018 15:39:09 AEST PM »

Hi Eski,

I did not take a full range of build pictures for this build but here are some all spider wind but some are RX coil and a couple are the latest TX coil but it does not matter the construction is the same.

Regards, Ian.


* Spider coil build 003.JPG (31.89 KB, 448x336 - viewed 197 times.)

* Spider RX Build 001.JPG (28.28 KB, 448x336 - viewed 198 times.)

* TX spider coil 002.JPG (34.76 KB, 448x336 - viewed 192 times.)

* RX Spider coil new 003.JPG (26.88 KB, 448x336 - viewed 197 times.)

* TX Spider coil new 002.JPG (32.76 KB, 448x336 - viewed 200 times.)
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Regards, Ian.
autitch
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« Reply #772 on: Wednesday June 20 2018 16:15:19 AEST PM »

Hi Ian,
It’s great to hear you are well on the road to getting over your operation and I guess you must be getting keen to head out for a swing.  I’ve been looking at your most recent photos with great interest as I’m working on 14” flat wound coil with homemade “mad” litz wire and coax.  I was wondering how you have shielded the windings.  I’ve been scratching around for a reliable shielding method and I can’t quite nail a reliable method.
AuTitch
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IBGold
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« Reply #773 on: Wednesday June 20 2018 16:35:26 AEST PM »

Hi Autich,

You are looking at it last picture Electro-Dag painted on heavy paper glued to former.

Regards, Ian.
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Regards, Ian.
WM6
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« Reply #774 on: Wednesday June 20 2018 18:54:12 AEST PM »

Great work Ian. Must say, again, from you.

Congratulations.
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autitch
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« Reply #775 on: Thursday June 21 2018 10:16:56 AEST AM »

Thanks Ian,

I'm looking for a supplier AATM There are so many different products which confusing the issue.

Gust wondering would this stuff work

  

it's available through Mektronics  Australia.

AuTitch
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« Reply #776 on: Thursday June 21 2018 15:55:55 AEST PM »

Hi AuTich,

The product I am using is Ex one of the coil makers and now no longer available to me what you require is something with a resistance of around 60 to 100 ohms per inch if you find something let me know as I am looking for something as I have only enough left for one coil that stuff would be OK for painting on the inside of the coil housing if the resistance is OK and it is a simple way of shielding anything with solvents is a problem on Styrofoam and XPS former's.

Regards, Ian. happy face
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Regards, Ian.
autitch
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« Reply #777 on: Thursday June 21 2018 16:04:36 AEST PM »

Hi Ian,

I’m assuming that the ohms measurement is performed with the probes one inch apart or do you use the four probe sensing method.

 AuTich,
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« Reply #778 on: Thursday June 21 2018 16:25:32 AEST PM »

You are correct 1" apart.

Regards, Ian. happy face
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Regards, Ian.
autitch
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« Reply #779 on: Thursday June 21 2018 16:26:45 AEST PM »

Thank Ian
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: The need for big deep gold detectors. « previous next »
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