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 4568 times)
sd220d Digger
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« Reply #100 on: Wednesday May 8 2019 18:12:17 AEST PM »

  
Well I did come up with a new name for you sd220d Digger

But then I saw Doug's rules in his reply

So unfortunately, I can't suggest it, and you would be unable to use it.

Mal

I can see who you have sided with.
Congratulations  innocent



 



Do you think Don'tbullshitme will give you a free coil like he did with Matt, for doing that video?
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Goldman
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« Reply #101 on: Wednesday May 8 2019 19:00:00 AEST PM »

Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.

Noting also that I am able to pick up all 5 targets at the Maryborough test patch with my 11” elite, with an especially good response on the 2 oz at 20”.

Both targets would need a huge hole to be dug to reap the hidden reward.

Cheers
Goldman
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sd220d Digger
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« Reply #102 on: Wednesday May 8 2019 19:26:36 AEST PM »

  
Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.

Noting also that I am able to pick up all 5 targets at the Maryborough test patch with my 11” elite, with an especially good response on the 2 oz at 20”.

Both targets would need a huge hole to be dug to reap the hidden reward.

Cheers
Goldman


That is a great result Goldman on the 18" NF coil
That's over 1 metre deep.

Who needs a $4800 coil that's only got $50 euros of components in it. Or maybe only $20 bucks worth.
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GARY
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« Reply #103 on: Wednesday May 8 2019 20:45:37 AEST PM »

  

Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.

Cheers
Goldman


A good result so how different were the QED settings with the 18" NF to the Maryborough tests with the 11 " Elite?

Gary.
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Goldman
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« Reply #104 on: Wednesday May 8 2019 21:25:09 AEST PM »

  
  

Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.

Cheers
Goldman


A good result so how different were the QED settings with the 18" NF to the Maryborough tests the 11 " Elite?

Gary.

Not a lot different really. In both cases, used THS-A as high as possible (80-90) with THS-B at NULL or 1 up, as all targets are falling pitch. Maryborough was with Mode 15 (I normally run mode 3 with my 11” elite) as we were  trying out depth tests with high modes on those YouTube videos at Maryborough. Not sure what Mode was at Talbot. From memory Gain was 9/10 at both sites, but dropped Gain at Maryborough if it got too noisy.

So fundamentally adopted the same techniques at both sites - set up for max depth for falling pitch targets.

Cheers Goldman
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GARY
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« Reply #105 on: Wednesday May 8 2019 22:09:00 AEST PM »

Thanks Goldman although I'd say I would not be capable of detecting over my ground with the GAIN up that high with the THS-A up that high as well. The majority of the time I have my GAIN no higher than 4 and mostly at 1 with the lowest possible THS-B (47-48) and the highest possible THS-A (60-70) to maintain a stable threshold when using my 8" or 11" coils while chasing small to medium sized gold.

Have not yet ventured out to detect using my larger 18" or 25" coils.

Gary.
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Goldman
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« Reply #106 on: Wednesday May 8 2019 23:03:36 AEST PM »

Hi Gary,

The Talbot test patch was ok to run at that setting. We did not do any detecting in the surrounding area. I operated the QED whilst Howard moved the target in and out from below. We were all able to hear the target with the standard speaker 6-8 inches above the ground level (so 42-44” in total).

This copied Matt’s technique to determine the depth for his CC coil video, so doing like for like.

I agree that in hot ground those settings may/would not be sustainable whilst detecting.

The settings you use would be great for the type of detecting you are doing - smallish gold with small to medium sized coils. I was doing the same last Monday morning (before the Talbot exercise) at nerrina, near Ballarat using the 11” elite with A50, 3-4 below NULL, M3, G6, which produced a quiet, stable threshold.

It’s worth noting that the THS-B setting is a relative number,  so I recommend that when talking THS-B, best to refer to a number below or above NULL. For example, I know of some QEDs where NULL is from 45 to around 50, so referring to a hard THS-B number can be misleading. I will be adding this to my tips thread probably tomorrow.

Cheers Goldman

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Dontbstme
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« Reply #107 on: Wednesday May 8 2019 23:38:01 AEST PM »

  
Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.



30" mono that I can manufacture right now will push this result up to 58" as the difference between 18" and 30" will give a detection boost of 33%. It will be as light as the 18" NF mono or lighter. It would be more expensive than the NF, but not much more, not even close to the 30"CC for ML.
Howard however seems reluctant for cooperation ideas, which gets my hands tight to do anything about QED users.

I also have a prototype 21" mono that is only 650 grams. With coil protection is 680 grams. Of course folks have the choice to get similar  size coils for less money, but nearly twice as heavy.
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GARY
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« Reply #108 on: Thursday May 9 2019 05:53:08 AEST AM »

  
Hi Gary,

It’s worth noting that the THS-B setting is a relative number,  so I recommend that when talking THS-B, best to refer to a number below or above NULL. For example, I know of some QEDs where NULL is from 45 to around 50, so referring to a hard THS-B number can be misleading. I will be adding this to my tips thread probably tomorrow.

Cheers Goldman



Yes that is an important point especially if other operators were thinking of trying the same THS-B setting as before I had my QED updated its NULL was lower than 50.

Gary.
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bugwhiskers
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« Reply #109 on: Thursday May 9 2019 07:32:07 AEST AM »

The NULL point can vary by as much as 5 from very hot to very cold days.
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bugwhiskers
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« Reply #110 on: Thursday May 9 2019 11:16:24 AEST AM »

  
  
Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.



30" mono that I can manufacture right now will push this result up to 58" as the difference between 18" and 30" will give a detection boost of 33%. It will be as light as the 18" NF mono or lighter. It would be more expensive than the NF, but not much more, not even close to the 30"CC for ML.
Howard however seems reluctant for cooperation ideas, which gets my hands tight to do anything about QED users.

I also have a prototype 21" mono that is only 650 grams. With coil protection is 680 grams. Of course folks have the choice to get similar  size coils for less money, but nearly twice as heavy.

I am very happy to be involved with anything for my fellow prospectors benefit provided it is realistically priced.
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sd220d Digger
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« Reply #111 on: Thursday May 9 2019 19:15:43 AEST PM »

  
  
  
Members with a QED should take heart with the tests we did last Monday at Talbot, 42-44 inches with a 18” NF on that lead target is a very good result.



30" mono that I can manufacture right now will push this result up to 58" as the difference between 18" and 30" will give a detection boost of 33%. It will be as light as the 18" NF mono or lighter. It would be more expensive than the NF, but not much more, not even close to the 30"CC for ML.
Howard however seems reluctant for cooperation ideas, which gets my hands tight to do anything about QED users.

I also have a prototype 21" mono that is only 650 grams. With coil protection is 680 grams. Of course folks have the choice to get similar  size coils for less money, but nearly twice as heavy.

I am very happy to be involved with anything for my fellow prospectors benefit provided it is realistically priced.

"Realistically priced " that is 100% correct Bugwhiskers
That's what us prospectors want to hear and not be taken for a ride with unreasonable and unrealistic prices.
Well done
Cheers  drinking red wine
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Dontbstme
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« Reply #112 on: Thursday May 9 2019 23:16:50 AEST PM »

  


I am very happy to be involved with anything for my fellow prospectors benefit provided it is realistically priced.

Brilliant.
Let's begin with getting some realistic retail price then.
Perhaps you could ask around to see if any company or workshop in Australia will accept to manufacture these coil parts. Please show them a picture of the 30" (it's everywhere on the Internet) and ask them to give you a rough estimate about their possible price.
See what they say.
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Dontbstme
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« Reply #113 on: Tuesday May 14 2019 03:26:37 AEST AM »

Today I have done some preliminary tests on the first production sample of the 30"CC Carbon Fibre coil in muddy conditions (it rains like hell in here).
The depth increase was noticeable only for the large targets with average of 10-15%.
The kitchen scale can that I use for large target test is not detectable at 205 cm in air in FP, Cancel, Fixed, Normal, Deep.
All small targets remain at the same detecting distance, which tells me this technology can go this far and no further regarding small targets been detectable with huge coils.

I also checked the target response in DD vs. Mono, vs. Cancel. Cancel is again the deepest, followed by Mono (less than 5% difference) and then DD by the look of it same as Mono.

I also run some comparison in Cancel between the 30"CC and 18" Mono Detech Boomerang (which I use as a benchmark) to see how the Cancel mode affects the detection of the kitchen scale can with the two coils.
The results were;
18"Mono Detech Boomerang - In Mono 170 cm, in Cancel 75 cm - depth loss approximately 56%
30"CC Nexus in Mono - 195 cm, in Cancel 205 cm. - depth gain 5%.

So the bigger 30" Nexus coil is only as deep as the size would suggest, which compared to a similar size Mono will be a similar depth result. However in Cancel mode is beyond comparison to anything else and Cancel mode is the one that handles much better difficult ground and EMI.

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sd220d Digger
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« Reply #114 on: Tuesday May 14 2019 12:52:46 AEST PM »

#910
User is Offline Candigger
 Member
Today 04:49 am
Reg Wilson wrote:
.............it is not a multinational conglomerate charging exorbitant prices for equipment cheaply manufactured in third world countries that are notorious for actual slave labour conditions.

You are not putting into perspective the majority's favourite ML in here. Are you?
lol
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Dontbstme
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« Reply #115 on: Saturday July 20 2019 05:47:26 AEST AM »

Here is an air test video of the latest production sample of the Nexus 30"CC for GPX.
The current 30" and 21"CC coils for GPX are designed to work in two basic modes of operation controlled from a switch box placed behind the coil plug. The modes are Maximum Depth and Hot Ground.
In Maximum Depth Mode the Nexus CC coils are fully compatible with the QED and will work on the QED detectors with full efficiency, despite their concentric design.

The pre-calculated depth increase of 20% (that I mentioned earlier) from the results of the prototype 30" coil has been achieved for some large targets. The average depth increase of the complete 30"CC design is 10-20% depending on type and size of targets.
In Maximum Depth Mode the sensitivity to very small targets (below 0.5 gram) is inhibited.

There are few more videos to come out in the next few days. Detailed tests on both 30"CC and 21"CC.

  
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bugwhiskers
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« Reply #116 on: Saturday July 20 2019 07:13:31 AEST AM »

I agree, let's talk about a realistic price.
Litz wire can be purchased for around $20 Kg, Carbon fibre probably less.
So if the coil weighed 2Kg and there was equal weight of wire and Carbon fibre then the material cost would be $40
How much do you charge per hour for your labour and how many hours are involved?
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WM6
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« Reply #117 on: Saturday July 20 2019 15:10:10 AEST PM »

  

Here is an air test video of the latest production sample of the Nexus 30"CC for GPX.


Nice design. But it "is sooo big!"

Assume that so big coil with such high sensitivity ask for very clear ground without any metal
waste and rubbish? Especially in shallow layer of ground where metallic rubbish is usually located.

Today it is wery hard to find such clear ground even far away from civilisaton.

In case of non-ferrous metallic rubbish (as lead BB etc.), discrimination is of little help, if any.

This could be big problem in real use of such big and sesitive coil, apart from heavy weight.
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mylab
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« Reply #118 on: Saturday July 20 2019 22:29:05 AEST PM »

  
Here is an air test video of the latest production sample of the Nexus 30"CC for GPX.

In Maximum Depth Mode the Nexus CC coils are fully compatible with the QED and will work on the QED detectors with full efficiency, despite their concentric design.

There are few more videos to come out in the next few days. Detailed tests on both 30"CC and 21"CC.


An interesting video using the modification to your 30"CC which would allow it to be used on the QED.
Further detailed videos should be interesting now that another overseas manufacturer has now released a 32" CC onto the Australian market.

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mylab
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« Reply #119 on: Tuesday July 23 2019 00:05:17 AEST AM »

  

There are few more videos to come out in the next few days. Detailed tests on both 30"CC and 21"CC.


Watched your latest video: 30"CC for Minelab GPX, depth test in highly mineralised ground.
And good that you included in this particular test an Australian 50c coin which now enables the use of the same 50c coin here to be used with whatever coil and GPX or other detector we chose for a comparison to ascertain that your 30" CC has an advantage depth wise.
Also of interest will be that you perform the same tests using the 21"CC coil and same GPX settings at this mineralised test spot over the same buried targets including the 50c coin.
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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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