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 #40 on: Wednesday March 20 2019 16:34:15 AEDT PM »

  
Found this question on Facebook.

Question: I always hear and read that you need to set the mode to suit the coil, how do you determine this?

Answered by Bugwhiskers: If the mode is too low for the coil then GB will be poor.

Gary.


To go even further with this, with some coils you just cannot ground balance below a certain mode number. For example, the lowest mode I can ground balance my 11" elite is Mode 3, whereas in WA I could not MGB my 15 round EVO below Mode 5. The 8" commander will MGB in Mode 1, same as the Sadie.


Cheers,
Goldman
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GARY
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« Reply #41 on: Wednesday March 20 2019 16:56:37 AEDT PM »

Good stuff to digest Goldman, Detection Holes, Modes & Coils.

In regards to Coils & Modes it would  appear the smaller the Coil the lower the Mode.

Gary.
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Goldman
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« Reply #42 on: Wednesday March 20 2019 19:26:24 AEDT PM »

Hi Gary,

I don't think there is a linear Mode progression based on coil size, but Modes 1-8 are for small coils; whereas 8-15 are for larger coils. But, and this is a big 'but', there is no reason you can’t use the higher modes with small coils especially if the ground is horrendous, as this may be the only way you can achieve a proper MGB and not be pinging off on all sorts of non-targets (e.g. ground noise, hot rocks and the like).
 
Let’s not forget that small coils are primarily for finding smaller gold. The TC of smaller gold is short (rising pitch) when compared with larger targets (falling pitch).
 
Modes 1-8 sample earlier to catch the faster decay thus 'find' the smaller gold. Modes 8 onwards sample later, thus you may miss the (very) small targets.
 
There is a progression of the sample delay time from Modes 1-15.
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Reg Wilson
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« Reply #43 on: Wednesday March 20 2019 22:22:58 AEDT PM »

Well Goldman, you do have the QED sussed, and know how to get the best out of it, unlike a certain 'expert' who thought he was too smart to learn anything new. The QED is a new ballgame, and applying the old rules and trying to make the detector adapt to your old habits is just dumb and doomed to failure. Smart people adapt, and prosper. Well done.
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bugwhiskers
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« Reply #44 on: Thursday March 21 2019 06:40:13 AEDT AM »

When turning the QED on just press the UP button once quickly.
If there is a fault with the coil the detector will try to shut down immediately but if the button is pressed for too long the fuse will blow.
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« Reply #45 on: Thursday March 21 2019 09:56:56 AEDT AM »

  
Well Goldman, you do have the QED sussed, and know how to get the best out of it, unlike a certain 'expert' who thought he was too smart to learn anything new. The QED is a new ballgame, and applying the old rules and trying to make the detector adapt to your old habits is just dumb and doomed to failure. Smart people adapt, and prosper. Well done.

Thanks Reg,
I have had mine from very soon after it was released and find it a pleasure to use. Howard has helped enormously in my understanding of how it works, especially in how the internals work, which can then be extrapolated into detecting our fantastic  gold fields.
I am just trying to share what I have learnt with the greater QED fraternity, but in the end, there is no better teacher than putting the hours in on the ground.
Cheers Goldman
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Doug
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« Reply #46 on: Thursday March 21 2019 11:07:54 AEDT AM »

  
  
Well Goldman, you do have the QED sussed, and know how to get the best out of it, unlike a certain 'expert' who thought he was too smart to learn anything new. The QED is a new ballgame, and applying the old rules and trying to make the detector adapt to your old habits is just dumb and doomed to failure. Smart people adapt, and prosper. Well done.

Thanks Reg,
I have had mine from very soon after it was released and find it a pleasure to use. Howard has helped enormously in my understanding of how it works, especially in how the internals work, which can then be extrapolated into detecting our fantastic  gold fields.
I am just trying to share what I have learnt with the greater QED fraternity, but in the end, there is no better teacher than putting the hours in on the ground.
Cheers Goldman


Your tips Goldman are so important and useful i think they should be incorporated in to the next version of the QED users manual.
doug smile
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Goldman
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« Reply #47 on: Thursday March 21 2019 13:27:41 AEDT PM »

  
  
  
Well Goldman, you do have the QED sussed, and know how to get the best out of it, unlike a certain 'expert' who thought he was too smart to learn anything new. The QED is a new ballgame, and applying the old rules and trying to make the detector adapt to your old habits is just dumb and doomed to failure. Smart people adapt, and prosper. Well done.

Thanks Reg,
I have had mine from very soon after it was released and find it a pleasure to use. Howard has helped enormously in my understanding of how it works, especially in how the internals work, which can then be extrapolated into detecting our fantastic  gold fields.
I am just trying to share what I have learnt with the greater QED fraternity, but in the end, there is no better teacher than putting the hours in on the ground.
Cheers Goldman


Your tips Goldman are so important and useful i think they should be incorporated in to the next version of the QED users manual.
doug smile

Yeah, I suspect they will be in the next manual, some already are in the current version.

Cheers Goldman
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Goldman
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« Reply #48 on: Monday April 15 2019 15:20:29 AEST PM »

As I have explained before in the manual, you will not be able to ground balance (MGB/AGB) out a target when testing a target by using the MGB +-4 Method. A ground noise however will either disappear altogether or diminish in volume when using the MGB +- Method; the target centre might also move, which is also another tell tale sign that the target is a ground noise.

Further to the above, a target will simply not disappear at all regardless of how far you move the MGB, up or down; even with the MGB at 001 (minimum) or 200 (maximum) the target response will not disappear, so have complete confidence in the MGB +- method.

I have often dropped the MGB by approx. 20 when detecting, just to make absolutely sure of a target - no sense digging unnecessarily.

I have tested this with a 5c coin (rising pitch) and a $2 coin (falling pitch) and with a small (.14 g) nugget and a 9g nugget and in both scenarios the targets remained loud and clear.

By the way, a 5c coin (rising pitch) is one side of the detection hole, whereas the $2 coin (falling pitch) is the other side of the hole. For a detailed explanation of the detection hole refer to a post in this thread where I have described how to test the hole for yourself and how to change settings if you believe a target is in the hole.

Cheers Goldman
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Goldman
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« Reply #49 on: Thursday May 9 2019 13:11:37 AEST PM »

THS-B
The THS-B NULL setting can vary by as much as 5 from a very hot day (approx 30+C) to a very cold day (approx. 10 C), so it’s most important to find your NULL point each time your out detecting. As the box warms up, especially from a cold day, the THS-B NULL point may move, so check it again after around 30 minutes just to be sure.

In addition, THS-B NULL may vary between QEDs, meaning that your mate’s QED NULL could be a different number to your own on the same day at the same place.

So for both of the above reasons, we should all refer to our THS-B setting as relative to NULL. For example, use ‘2 below NULL’; 3 above NULL, etc, rather than using a hard number like 45. For some fellow QED owners 45 is NULL, whereas for others it could be 5 below NULL.

By referring to it this way will ensure that anyone wanting to try out someone else’s settings will be able to set up correctly and hopefully find a bit of yellow.

Cheers Goldman
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« Reply #50 on: Thursday May 9 2019 13:37:02 AEST PM »

GAIN
The Gain setting is from 1 to 10, with 1 as the default.

Changing Gain from 1 to 10 will result in an exponential increase in performance (not linear), with the greater change occurring at the low end, and less at the top end.

For example, you will find a much greater benefit moving from 1 to 2, rather than moving from 9 to 10.

That’s not to say that you should not use the entire range, just that you get much better ‘bang for buck’ at the low - mid end of the scale.

For this reason, I use the range from 1 - 6 and rarely have Gain any higher than 6.

Cheers Goldman

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Goldman
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« Reply #51 on: Monday May 13 2019 12:54:19 AEST PM »

Low battery voltage

People have been asking about the QED batteries and how long they may last, so I thought it was a good time to discuss the low battery operation of the QED.

To do this I have extracted and slightly edited the battery section from the manual, as it says it all quite well and is as follows:
———
The QED displays the battery voltage in the range from ~5.98 - 9.99 Volts.

The detector is designed to run on a battery voltage of 10 Volts maximum and 6 Volts minimum.

To protect the rechargeable batteries, the detector will automatically turn off when a low battery voltage is detected.

When the battery reaches 6 volts a decimal point appears the RHS of the screen for a (very) short time before the detector switches off at 5.95 volts.

- If the operator shuts down when the decimal point appears the current settings will be saved.

- If the detector shuts off due to low battery voltage the current settings will NOT be automatically saved.
———

So when your out and about detecting and your getting to about the 8 hour mark, continually check your battery voltage and keep an eye out for that decimal point on the screen. The decimal point comes on no matter which screen you are on.

However it’s probably best to turn the QED off (which saves your current settings) before your battery voltage drops to 6 volts, swap out the batteries for a fully charged set and continue detecting.


Cheers Goldman
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GARY
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« Reply #52 on: Monday May 13 2019 17:27:54 AEST PM »

Thanks for the ongoing tips Goldman.

Apparently lower MODE settings draw less from the batteries?

Gary.
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« Reply #53 on: Monday May 13 2019 18:37:56 AEST PM »

It is amazing that BW has been able to get the QED when set in MODE 1 with a Sample/Pulse Delay as low as 7.50 micro seconds to operate successfully over high mineralised ground as the other day I had my QED operating quietly in MODE 1 over ground with a high GB reading, THS-B at 3 positions below Null/Neutral, THS-A at 60, GAIN at 5 while detecting with my 8" mono coil.

As far as i know there is only one other PI detector(recently released) that is operating with the Sample/Pulse Delay as low as 7 micro seconds and it is a beach detector.

Gary.

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Goldman
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« Reply #54 on: Monday May 13 2019 20:31:59 AEST PM »

  
Thanks for the ongoing tips Goldman.

Apparently lower MODE settings draw less from the batteries?

Gary.

Yes lower modes draw less from the batteries.  Mode 1 absolutely draws the least, thus using mode 1 will extend your battery life when compared to say using mode 15 all day.

Cheers Goldman
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« Reply #55 on: Tuesday May 14 2019 10:50:53 AEST AM »

Hi Goldman, in what order would you personally alter the settings after a power refresh with a new small coil ? thanks
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Goldman
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« Reply #56 on: Tuesday May 14 2019 12:51:28 AEST PM »

  
Hi Goldman, in what order would you personally alter the settings after a power refresh with a new small coil ? thanks

Do you mean after a battery change where you shut the QED down before hand or as a result of the QED automatically shutting down due to low voltage.

If you shut it down yourself, your setting will be the same as when you turned it off.

In the case of the QED shutting down by itself, then do the following when using a small coil looking for small gold (which is a standard setup anyway, especially after a factory reset):

1. Set mode (preferably mode 1 if you can)
2. GB
3. Set THS-A to between 30 - 50
4. Set THS-B as far below NULL as possible
5. Gain as high as possible, but above 3
6. If you had altered pitch to suit you hearing, re-adjust pitch to suit.

My testing has shown (much the same) max depth can be achieved between 30 and 50 THS-A, with as much THS-B below NULL as you can get

For example with a Sadie:
Mode 1
A at 30
B at 6 below NULL
G at 5
Achieves much the same depth as
Mode 1
A at 50
B at 3 below NULL
G at 5

In both cases above, the THS-B setting was as low as possible just above the (too loud) noise threshold for the given THS-A setting.

There are good reasons to use either very low THS-B, low THS-A as apposed to higher THS-A resulting in THS-B closer to NULL (as in the above settings) and its all to do with the ground your detecting, ie very hot (hot rocks) or much milder ground.

In addition, the audio is more enhanced at low THS-B (4,5,6 below null) when compared to closer to null settings.

I will add another tip in this regard today.
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Goldman
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« Reply #57 on: Tuesday May 14 2019 17:26:41 AEST PM »

THS-B and rising pitch targets
As we all know, lowering THS-B below NULL accentuates rising pitch targets, that is small gold; shotties, etc.

But it also accentuates other non desirable rising pitch targets like hot rocks and rising pitch ground noises.

So if you are in an area which is prone to lots of rising pitch hot rocks and/or lots of rising pitch ground noises, then raise THS-A (say from 30 to 50; or from 50 to 70; or higher), then set THS-B to just under NULL or at NULL.

The QED will be less sensitive to rising pitch targets and you may miss the really small ones, but it will not be pinging off as much over hot rocks, etc. creating a more harmonious detecting experience.

Other strategies to reduce the effect of hot rocks and or highly variable ground is to GB over the hot area and see if you can detect without further GB changes over the surrounding ground.

Raising the coil a little more above the ground can also help to reduce the effects of hot rocks and/or ground noises.

Cheers Goldman
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« Reply #58 on: Wednesday May 15 2019 10:26:57 AEST AM »

Thank you Goldman for your very detailed reply much appreciated, I will print this out and study closely.
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GARY
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« Reply #59 on: Monday June 3 2019 13:16:55 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.
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