northwest QED tips
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australian electronic gold prospecting forum.com  |  QED users  |  QED users (Moderator: bugwhiskers)  |  Topic: QED tips 0 Members and 1 Guest are viewing this topic. « previous next »
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Goldman
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« on: Thursday February 7 2019 16:13:41 AEDT PM »

I’ve started this thread to uncover everyone’s hard won tips.

I will start with a few:

1) AGB: have THS-B at null to use the AGB, IF biased either below or above null, the AGB will not be anywhere near as effective

2) in very mild to mild ground, for falling pitch (large) targets use the lowest GB number where the QED is still in GB. This will enhance detection distance for falling pitch targets.

3) for headphone use only, to avoid having a noisy threshold noise in your ear all day, use low THS-A, THS-B at NULL, Gain as high as possible, appropriate Mode. When the QED  detects a target, internally the pitch change happens (well) before the volume change, so carefully listen for pitch change (rising or falling) not just volume change.


Cheers Goldman
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Goldman
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« Reply #1 on: Friday February 8 2019 08:41:14 AEDT AM »

THS-A and THS-B relationship

With THS-A set to near max or at max (90), then the useable THS-B band has decreased to perhaps 1 (no more than 2, and it would be noisy) either side of null.  Conversely, with low THS-A, then the useable THS-B is around 5-6/7 either side of null.
This is how the QED can be set up right on the edge of max performance, either looking for small stuff (biased very low) or looking for bigger stuff (high bias), or at neutral using THS-A (high) looking for any targets. The A in THS-A means ‘all targets’. Once the above is understood (with the appropriate Mode, and Gain), then you are well on your way to utilising the full potential of the QED.

BTW, near max (or max) THS-A, is another way of finding the THS-B null point, as the least noisy THS-B point is null.
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Goldman
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« Reply #2 on: Wednesday February 13 2019 18:41:31 AEDT PM »

Ground Balance:
in very mild to mild ground, for rising pitch (small) targets use the highest GB number where the QED is still in GB.
This will enhance detection distance for rising pitch targets.
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GARY
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« Reply #3 on: Thursday February 14 2019 11:06:16 AEDT AM »

Thanks Goldman for your Tips.

I have attached a pic below of some Ground Balance readings I observed over mineralised ground with a Commander 8" mono on the QED.

Gary.


* Ground Balance Readings.jpg (24.33 KB, 307x149 - viewed 73 times.)
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Goldman
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« Reply #4 on: Thursday February 14 2019 12:35:41 AEDT PM »

  
Thanks Goldman for your Tips.

I have attached a pic below of some Ground Balance readings I observed over mineralised ground with a Commander 8" mono on the QED.

Gary.

Hi Gary,
Did you find that you had any leeway with the GB (ie. GB ok 1 or 2 either side of the numbers quoted). In WA last year I had to be absolutely spot on with no leeway at all.
In some ground here in the GT, you can achieve proper GB between say 96 - 130 and anywhere in that range is OK, whereas other areas (ie. Maryborough), the GB needs to be spot on. The ‘on the fly’ GB method is good in those circumstances as it does not slow you down too much
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GARY
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« Reply #5 on: Thursday February 14 2019 15:48:27 AEDT PM »

  
Hi Gary,
Did you find that you had any leeway with the GB (ie. GB ok 1 or 2 either side of the numbers quoted).


Actually Goldman the leeway in GB that you mention is something that I have not taken note of.

Interesting if that SOME or NO leeway provides additional info on how mineralised the ground is, as well as the GB figures.

Therefore from your GB figures for some ground in the GT being between 96 - 130 then I assume the ground at Maryborough that needs the GB to be spot with NO leeway mean a even higher GB figure is the result?  

Gary.

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Goldman
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« Reply #6 on: Thursday February 14 2019 16:37:55 AEDT PM »

  
  
Hi Gary,
Did you find that you had any leeway with the GB (ie. GB ok 1 or 2 either side of the numbers quoted).


Actually Goldman the leeway in GB that you mention is something that I have not taken note of.

Interesting if that SOME or NO leeway provides additional info on how mineralised the ground is, as well as the GB figures.



Therefore from your GB figures for some ground in the GT being between 96 - 130 then I assume the ground at Maryborough that needs the GB to be spot with NO leeway mean a even higher GB figure is the result?  

Gary.




Hi Gary,
Interestingly the GB around Maryborough (with my QED) is around 120 - 126, but with little or no leeway, and the ground is very mineralised. The area where there is significant leeway, south of Ballarat is nowhere near as mineralised. So yes, the leeway does indicate the level of mineralisation. Gold is still found in these lesser mineralised areas though. For example the quartz at Maryborough is very fractured and stained with iron and the ground is typically red but in the ‘south’ areas the quartz is more shiney/bright and the ground is nowhere as red.
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Goldman
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« Reply #7 on: Thursday February 14 2019 16:43:36 AEDT PM »

  
  
  
Hi Gary,
Did you find that you had any leeway with the GB (ie. GB ok 1 or 2 either side of the numbers quoted).


Actually Goldman the leeway in GB that you mention is something that I have not taken note of.

Interesting if that SOME or NO leeway provides additional info on how mineralised the ground is, as well as the GB figures.



Therefore from your GB figures for some ground in the GT being between 96 - 130 then I assume the ground at Maryborough that needs the GB to be spot with NO leeway mean a even higher GB figure is the result?  

Gary.




Hi Gary,
Interestingly the GB around Maryborough (with my QED) is around 120 - 126, but with little or no leeway, and the ground is very mineralised. The area where there is significant leeway, south of Ballarat is nowhere near as mineralised. So yes, the leeway does indicate the level of mineralisation. Gold is still found in these lesser mineralised areas though. For example the quartz at Maryborough is very fractured and stained with iron and the ground is typically red but in the ‘south’ areas the quartz is more shiney/bright and the ground is nowhere as red.


I should add that when in WA last year as soon as the QED got noisy I found that adjusting MGB up or down just 1 click fixed the problem, so it was telling me to MGB.
Cheers Goldman
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GARY
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« Reply #8 on: Thursday February 14 2019 21:36:28 AEDT PM »

Again in regards to the GB leeway would a higher MODE setting have an effect on the amount of GB leeway or a lower MODE more so.

Maybe have to test for GB leeway when out in the field next.

Gary.
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Goldman
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« Reply #9 on: Yesterday at 09:08 »

  
Again in regards to the GB leeway would a higher MODE setting have an effect on the amount of GB leeway or a lower MODE more so.

Maybe have to test for GB leeway when out in the field next.

Gary.

Gary, that’s something I haven’t tested. When last in mild ground I was using mode 3, but didn’t change modes. I’ll try it when next in that general area.
Cheers Goldman
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pedro
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« Reply #10 on: Yesterday at 12:15 »

Thanks Goldman & Gary for sharing your tips.
Much appreciated.
Cheers
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