northwest 30" CC for Minelab GPX, GP, SD and similar.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: 30" CC for Minelab GPX, GP, SD and similar. 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: 30" CC for Minelab GPX, GP, SD and similar.  (Read 2655 times)
mylab
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« Reply #20 on: Sunday March 10 2019 19:45:08 AEDT PM »

  

Tomorrow I'll repeat the video with better frame exposure so everything can be seen.


Thanks for the test results, appears impressive.
Look forward to viewing your video.
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Dontbstme
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« Reply #21 on: Monday March 11 2019 03:29:55 AEDT AM »

Here is the video and a decent group of test targets. Only one Ozzy nugget I am afraid. That's all I got.

  
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Reg Wilson
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« Reply #22 on: Monday March 11 2019 10:18:53 AEDT AM »

Great video. Great result. I want one, and how soon can I get one?
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Doug
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« Reply #23 on: Monday March 11 2019 11:10:45 AEDT AM »

  
Here is the video and a decent group of test targets. Only one Ozzy nugget I am afraid. That's all I got.

  


What is the inductance, resistance and Q for the coil?
doug smile
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GARY
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« Reply #24 on: Monday March 11 2019 11:27:31 AEDT AM »

Interesting video results from your time & effort.

Being a bit of test freak myself here is a pic of my attempt at air testing a 375ml Aluminium Solo Lemon Drink Can above an 18" mono on my GPX5000.

Results for a clear signal response:
Coil used ------  18” Advantage Mono Nuggetfinder        
Search Mode ------ Deep                                                    
Gain ----- 10   Stabilizer ----- 10                                            
Audio Tone ---------- 34                                                        
Timings ----- Enhance ----------- Fine Gold-------------- Normal          
Target :            
Alum Can     42” (106cm)            41” (104cm)              46” (116cm)              
 


* Air Test with Aluminium Can over 18 Mono on GPX5000.jpg (188.27 KB, 490x823 - viewed 187 times.)
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« Reply #25 on: Monday March 11 2019 11:55:18 AEDT AM »

  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile
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sd220d Digger
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« Reply #26 on: Monday March 11 2019 13:21:30 AEDT PM »

  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???
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Doug
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« Reply #27 on: Monday March 11 2019 13:31:44 AEDT PM »

  
  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???


Good point! Needs to be tested ASOP in Australian goldfields.
Reg would be  a good person to do the testing.
doug smile
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Dontbstme
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« Reply #28 on: Monday March 11 2019 15:27:12 AEDT PM »

  
  
Here is the video and a decent group of test targets. Only one Ozzy nugget I am afraid. That's all I got.

  


What is the inductance, resistance and Q for the coil?
doug smile
275uH and 0.25 Ohms. The details of the Litz wire are not going to be disclosed.
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Dontbstme
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« Reply #29 on: Monday March 11 2019 15:30:43 AEDT PM »

  
Interesting video results from your time & effort.

Being a bit of test freak myself here is a pic of my attempt at air testing a 375ml Aluminium Solo Lemon Drink Can above an 18" mono on my GPX5000.

Results for a clear signal response:
Coil used ------  18” Advantage Mono Nuggetfinder        
Search Mode ------ Deep                                                    
Gain ----- 10   Stabilizer ----- 10                                            
Audio Tone ---------- 34                                                        
Timings ----- Enhance ----------- Fine Gold-------------- Normal          
Target :            
Alum Can     42” (106cm)            41” (104cm)              46” (116cm)              
 
Thanks for sharing Gary. Your top results tells me that my coil is on the right track with its sensitivity as the depth increase from 18" to 30" would be about 33% and it works just like that. 116 cm x 1.33=154.28cm I got just about 155cm.
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Dontbstme
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« Reply #30 on: Monday March 11 2019 15:35:03 AEDT PM »

  
Great video. Great result. I want one, and how soon can I get one?
Thanks Reg.
The answer is as soon as this coil design gets proven in Oz. A 41" CC is coming soon too.
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IBGold
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IBGold at home.


« Reply #31 on: Monday March 11 2019 15:35:45 AEDT PM »

  
  
  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???


Good point! Needs to be tested ASOP in Australian goldfields.
Reg would be  a good person to do the testing.
doug smile

I agree.

Regards, Ian.
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Regards, Ian.
Dontbstme
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« Reply #32 on: Monday March 11 2019 15:36:30 AEDT PM »

  
  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???

It will be.
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mylab
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« Reply #33 on: Wednesday March 13 2019 00:22:39 AEDT AM »

I see Gary produced a similar result on a 375ml aluminium drink can in Normal timing as I did.
Now if I were to use the formula that Dontbsme used for an idea on the extra depth of a larger coil over a smaller coil then going from an 18” coil up to Reg’s 36” coil on a GPX in Normal timing the aluminium drink can would register an depth increase from 116cm up at 174cm.

As Reg is interested in testing Dontbstme’s 30”CC coil then I assume Reg is to test the 30”CC coil on the QED.
Reg could you test a 375ml aluminum drink can over your 36” coil resting on the ground using the QED in its strongest setting as is Normal timing on the GPX?
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Dontbstme
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« Reply #34 on: Wednesday March 13 2019 02:10:16 AEDT AM »

  
I see Gary produced a similar result on a 375ml aluminium drink can in Normal timing as I did.
Now if I were to use the formula that Dontbsme used for an idea on the extra depth of a larger coil over a smaller coil then going from an 18” coil up to Reg’s 36” coil on a GPX in Normal timing the aluminium drink can would register an depth increase from 116cm up at 174cm.

As Reg is interested in testing Dontbstme’s 30”CC coil then I assume Reg is to test the 30”CC coil on the QED.
Reg could you test a 375ml aluminum drink can over your 36” coil resting on the ground using the QED in its strongest setting as is Normal timing on the GPX?

The thing with larger coils is that the function of depth increments is not linear.
Let say with 18" you get the drink can at 1.16 cm and with 50% larger coil diameter you can get the extra 25% depth increment. This does not mean the depth increments will keep up on a coil 100% larger in diameter.
As coils get larger they loose sensitivity to smaller and/or medium size targets and begin to gain sensitivity to bigger targets.
The reason behind this phenomenon is the reduction of transmitted field intensity. We still use the same transmitter, but with the coil getting bigger the field becomes less intense.
Considering that the 4500 with my 30" CC gets my Aussie nugget at 15 cm (which is more than Garrett ATX with 12"DD can do) I would expect the coil size increase to Reg's 38" to keep up the depth increments for the soft drink can.

Come on Reg. Give us a hint, will ya?
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sd220d Digger
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« Reply #35 on: Wednesday March 13 2019 13:13:39 AEDT PM »

  
  
  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???

It will be.

For $4800 (one of your coils Don'tbullshitme and Candigger) I can buy two QED detectors and two 25" Nugget Finder coils and two smaller coils and find gold.   drinking red wine

What have your coils found for a price tag of $4800?....... Oh yeah, that's right......... Cans air tested @ 1.5 metres in the air   Rolling on the floor laughing!
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sd220d Digger
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« Reply #36 on: Wednesday March 13 2019 13:17:30 AEDT PM »

  
  
  
  
  
Great video. Great result. I want one, and how soon can I get one?

If this coil can reproduce these results over our GF soils then i believe this coil will blow the SAD7000  out of the water for depth even  when using the 19" dog coil or the Russian coils!
doug smile

Is this coil worth $4800 that is not even proven to find any gold nuggets in Australian Goldfields???

It will be.

For $4800 (one of your coils Don'tbullshitme and Candigger) I can buy two QED detectors and two 25" Nugget Finder coils and two smaller coils and find gold.   drinking red wine

What have your coils found for a price tag of $4800?....... Oh yeah, that's right......... Cans air tested @ 1.5 metres in the air   Rolling on the floor laughing!

Ok, that's not funny but do you see what I'm saying?
Proven versus unproven.
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Reg Wilson
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« Reply #37 on: Wednesday March 13 2019 20:33:37 AEDT PM »

I am working on a prospecting project at the moment. Will do some testing in a few days
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mylab
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« Reply #38 on: Thursday March 14 2019 00:25:08 AEDT AM »

  

 Will do some testing in a few days


Thanks Reg and I now realise your large mono is 38" and not 36" as I said before.
Be interesting how high the aluminium Can will register a response on the QED with that 38" mono.
Dontbstme's result at 155cm was with a smaller 330ml Can although of same diameter as the 375ml Can used in Gary's result at 116cm.
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Dontbstme
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« Reply #39 on: Thursday March 14 2019 06:36:59 AEDT AM »

  

Dontbstme's result at 155cm was with a smaller 330ml Can although of same diameter as the 375ml Can used in Gary's result at 116cm.
In theory if I was to use 375 ml can then the air test would have gone to 165 cm, 10 cm (6.5%) more than what I got with 330 ml can.

Tomorrow I will be down to South BG on a super heavy mineralised site. It is a Vanadium mine first developed by the Germans in WW2. I will have with me Hristo Terziev a popular Bulgarian geologist to identify all of the rocks and soil conditions. I will ask him if we can take some soil measurements as well. Let see if the GPX will be able to do any GB on those conditions. There will be few more mono and DD coils from Detech and Minelab for the trials to make sure what ever the result with my 30"CC comes out is legitimate.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: 30" CC for Minelab GPX, GP, SD and similar. « previous next »
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