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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« Reply #60 on: Monday June 3 2019 14:33:08 AEST PM »

  
  

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.


Goldman in regards to your opening post and number 2) is there any tip for the GB number in mineralised ground to enhance detection distance for falling pitch targets?

Gary.

Hi Gary,

The same applies, I used an example in my first post where in less mineralised ground a perfect GB could be achieved anywhere between approx 85 and up to about 120, this difference I call the GB leeway. This was south of Ballarat using my 11” elite in mode 3.

In mineralised ground, the leeway will be small to very small, for example in an area in WA last year 1 MGB click either way of my GB was enough to be out of GB. In Maryborough, VIC the leeway may also be very small, exact, 1 or 2 depending on the area. If you do have a leeway, choose the lowest GB number where you are still in perfect GB.

In addition, when searching for falling pitch (large) targets, my testing has shown that best depth will be achieved when using:
A: greater than 55
B: as high above NULL as you can achieve on the day with the THS-A setting
G: start at 6
M: above 8

My best depth test results were achieved using A: 60; B: 6 above NULL; M: 12; G: as high as I could achieve without it being noisy.
Although using A: 70; B: 4 above NULL achieved almost the same depth.

I was unable to go higher than 70 with A when testing due to the unacceptable noise levels on the day.

My recommendation is to use A as high as you can get and yet still achieve B above NULL. For example,  A at 90 with B 1 above NULL is better than 90 and NULL, if that makes any sense. start with G at 6, and drop to no lower than say 4, if you need to go lower, raise mode, then adjust G back up

My testing also revealed that you lose very little in depth performance when using high Modes. One test revealed mode 8 had the best depth, a small loss above 8, with modes 12 to 15 being the same.

PM me if you want to discuss.

Cheers Goldman
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GARY
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« Reply #61 on: Monday June 3 2019 19:07:38 AEST PM »

Thanks Goldman and you have very clearly answered my question as the GB leeway was the key wording.

Also thank you for your test results and recommendations which I will utilise.

You have a good understanding on how to get the best from our QEDs.

Gary.
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« Reply #62 on: Thursday June 6 2019 09:29:25 AEST AM »

Auto Ground Balance (AGB)

A couple of things to remember when performing an AGB:
1. AGB works best when THS-B is at NULL

2. hold the coil approximately 15” above the ground, then whilst depressing the AGB Button, lower the coil towards the ground in a very fast motion

3. release the AGB Button at about 3” from the ground.

4. If needed after the AGB, perform a MGB to make incremental adjustments to achieve a perfect GB (i.e. when the tone has faded to a minimum.

Notes:
a. do not let the coil touch the ground during the AGB process as it may produce unexpected results.

b. it is most important to lower the coil towards the ground in a very fast motion.

c. the AGB works best when the current detector GB setting is far different from the current ground setting.

Cheers Goldman
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« Reply #63 on: Friday June 7 2019 11:49:18 AEST AM »

Checking/adjusting Ground Balance on the fly whilst detecting

An easy and fast way to check and adjust the ground balance on the fly is a worthwhile tool to have in your arsenal. Once you get used to it, it can save you a lot of time.

It is as simple as swinging the coil in an upwards direction at the end of your swing, like a pendulum, to check the GB. This is contrary to good detecting practice where for even/maximum detecting distance a full flat swing from side to side is essential.

So from time to time to check the GB while you are detecting, swing the coil up at the very end of your swing and take note of any pitch change:

1. If you are still in GB, the detector will remain quiet, so keep detecting
2. If you get a rising pitch, adjust the MGB up until the detector is back in GB
3. If you get a falling pitch, adjust the MGB down until the detector is back in GB

It’s worth noting that for this to work effectively and quickly for you, the QED should be in the MGB adjust setting whilst you are detecting. I always set it back to this position after adjusting anything so that I am ready to adjust the MGB while I am detecting. A quick way to do this is to momentarily push the AGB button - this sets the QED back to the MGB adjust setting from any setting.

The above ‘on the fly’ GB method is a quick and effective method to check/adjust the GB without stopping to perform the standard MGB process, which takes more time.

it’s also worth noting that the ‘on the fly’ MGB adjustment direction is the reverse of the standard MGB process, which is based on the pitch as you LOWER the coil to the ground.


Cheers Goldman
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GARY
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« Reply #64 on: Friday June 7 2019 12:19:03 AEST PM »

  

It’s worth noting that for this to work effectively and quickly for you, the QED should be in the MGB adjust setting whilst you are detecting. I always set it back to this position after adjusting anything so that I am ready to adjust the MGB while I am detecting. A quick way to do this is to momentarily push the AGB button - this sets the QED back to the MGB adjust setting from any setting.


it’s also worth noting that the ‘on the fly’ MGB adjustment direction is the reverse of the standard MGB process, which is based on the pitch, as you LOWER the coil to the ground.




Those 2 are definitely worth noting Goldman.

Actually a momentarily push of the AGB button which quickly resets the adjustment screen back to the MBG screen from any other screen setting is something I have forgotten to use so thanks for that tip.

Gary.
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