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QED coming soon!
Goldsearch Australia has been appointed the Australian Distributor for the QED.Check their website after  Wed 7th Dec 2016.
Global temperature goes from heat record to heat record, yet the sun is at its dimmest for half a century.
What is empirical  evidence?
Empirical evidence is information acquired by observation or experimentation. This data is recorded and analyzed by scientists and is a central process as part of the scientific method. Why is everything posted on climate by Inhere always horseshit?
Poor old  Inhere on finders still does not know the difference between weather and climate!The silly old goat seems to think because some places have recently had very cold weather that this brings into question  AGW!  Only right wing rabble rubbish climate deniers like horseshit Inhere don't  seem to understand  that AGW will mean that some regions of the earth will become colder!
Why is  onehalfgram :1/2 wit always wrong  on the QED?

australian electronic gold prospecting forum.com  |  Pi metal detector by Bugwhiskers  |  QED Detector ,latest updates  |  Topic: updates 0 Members and 1 Guest are viewing this topic. « previous next »
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GARY
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« Reply #180 on: Saturday September 10 2016 16:38:40 AEST PM »

  

The current QED GB method is radically different to the previous one.
It and the adjustment method are very different to Minelab's method and demonstrably better.


The other video clip displaying a Ground Balance of the QED with a 12" Evo coil does indeed demonstrate the ability of the QED to GB itself completely to the ground and then able to rest the coil back down onto the ground without producing a signal response.

I know from my experience on 2 previous trips to Victoria that the ground down there is highly mineralised so your video demonstration shows the merits of your GB method.

Gary..
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egixe4
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« Reply #181 on: Saturday September 10 2016 16:38:59 AEST PM »

That GB looks very good Bugwhiskers
Well done
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bugwhiskers
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« Reply #182 on: Saturday September 10 2016 16:48:48 AEST PM »

The ground at the site has a top layer around 3" thick and then red clay for at least 24".
We know because the fellow trying to GB the 5000 dug a huge hole some 40 metres away. (PS It was good exercise with no reward)
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egixe4
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« Reply #183 on: Saturday September 10 2016 19:11:08 AEST PM »

I like that Red Clay  excited
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Blacksand
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« Reply #184 on: Saturday September 10 2016 22:02:38 AEST PM »

Nice work! Must be a lightweight detector to swing too.
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bugwhiskers
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« Reply #185 on: Sunday September 11 2016 06:00:40 AEST AM »

The GB / SMF cancellation method is another variation of the use of an integrator as a null summation/averaging means pioneered by Eric Foster in 1968. Variations of it have featured in many detectors and patents over the years.
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kazza
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« Reply #186 on: Sunday September 11 2016 09:59:45 AEST AM »

Thanks BW for sharing.

2 questions please:

It appears, unless I am mistaken, that the audio of the QED is “mono-directional” for want of a better description, the same as most all-metal modes in VLFs/”coin” detectors, meaning that when the HPF signal driving the audio is of one polarity, the audio loudness is proportional, but when the polarity is reversed, the audio is off below threshold, whereas, the ML PI audios are “bi-directional,” meaning that when the HPF signal driving the audio is of one polarity, the audio loudness is proportional (and the pitch changes in proportion including sign), and also when the polarity is reversed, the audio loudness again is proportional to magnitude (and the pitch again changes in proportion including sign); in other words, the ML audio is never off below threshold in contrast to what I believe the QED is doing. Have I observed correctly?

Second, what caused the QED signals when the coil was moving rapidly high up above the soil?
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bugwhiskers
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« Reply #187 on: Sunday September 11 2016 15:43:08 AEST PM »

Kazza, back when the video was made a few months ago the QED had falling pitch for short TC targets (one side of the detection hole) and rising pitch for long TC targets (the other side of the detection hole). The latest firmware has reversed that as it is what many prospectors are familiar with.
Most people who are experienced with PI would recognise that swinging the coil rapidly through the air generates a voltage due to the Earth's magnetic field. Swinging it as rapidly as I did was a way of showing how close to perfect the EF cancellation is. In reality, the EF has to be good enough to allow normal swing speeds in one plane only as is done when detecting slopes or vertical creek banks. Eric Foster published the method to accomplish this using an integrator as a null summation / averaging means in 1968.
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Doug
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« Reply #188 on: Sunday September 11 2016 17:23:33 AEST PM »

  
Kazza, back when the video was made a few months ago the QED had falling pitch for short TC targets (one side of the detection hole) and rising pitch for long TC targets (the other side of the detection hole). The latest firmware has reversed that as it is what many prospectors are familiar with.
Most people who are experienced with PI would recognise that swinging the coil rapidly through the air generates a voltage due to the Earth's magnetic field. Swinging it as rapidly as I did was a way of showing how close to perfect the EF cancellation is. In reality, the EF has to be good enough to allow normal swing speeds in one plane only as is done when detecting slopes or vertical creek banks. Eric Foster published the method to accomplish this using an integrator as a null summation / averaging means in 1968.

Was the QED "dumbed" down for the test?
doug smile
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bugwhiskers
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« Reply #189 on: Sunday September 11 2016 17:45:16 AEST PM »

If it was deliberately "dumbed" down then EF would not have been heard at all !
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WM6
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« Reply #190 on: Sunday September 11 2016 21:37:04 AEST PM »

Excellent results of small part time BW-Lab.

Congratulations.

What would be preferred mono coil technical data for QED?
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pedro
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« Reply #191 on: Monday September 12 2016 05:04:36 AEST AM »

Thanks for sharing BW
Very impressive considering the small amount of electronics compared to the other brand.
As they say less is more.
Well done.
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bugwhiskers
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« Reply #192 on: Monday September 12 2016 06:33:27 AEST AM »

  
Excellent results of small part time BW-Lab.

Congratulations.

What would be preferred mono coil technical data for QED?

The acceptable range is yet to be characterised.
Dave Emery's patent pending "front end" is automatic and will not pass the signal until the amplitude is down to an acceptable level. If a high capacitance / slow coil is used, no damage will ensue.
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bugwhiskers
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« Reply #193 on: Tuesday September 13 2016 10:02:19 AEST AM »

Re the EF / SMF (log uniform signal) cancellation, the QED menu item #6 allows the user to fine tune it. range 1-100 with a default of 50. Each step alters the width of the Long TX sample by 20 nano seconds. 20ns is the time it takes light to travel 20 feet !

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« Reply #194 on: Wednesday September 14 2016 09:25:32 AEST AM »

 Have the new QED power leads arrived yet?
doug smile
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« Reply #195 on: Wednesday September 14 2016 11:06:28 AEST AM »

Power connectors.


  


  


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kazza
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« Reply #196 on: Wednesday September 14 2016 18:29:11 AEST PM »

Indeed, as you say BW, Eric’s Goldscans did cancel the earth’s field. I managed to buy one of his earliest models whilst in the EU about 10 years ago, and had all the capacitors changed (I am told they can age badly). It certainly detects in air and does a reasonably good job of cancelling the earth’s field, but unfortunately it is unusable in the Aus goldfields, and even in my back garden, unlike the famous A2Bs/Groundhogs etc. Pity. I have been told by a well-known retired dealer that they only ever had one Goldscan in stock but were unable to sell it because it would not work in Aus soils.

Clearly your QED seems to GB OK! Nice one.
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bugwhiskers
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« Reply #197 on: Thursday September 15 2016 06:08:51 AEST AM »

Kazza, the point is that Eric in 1968 pioneered the use of an Integrator as a null summation / averaging means. By arranging the positions and widths of samples he was able to cancel EF/SMF (Log uniform) signals. Later he added samples to cancel the Log Linear signal from the ground. This is all before ML began R&D on Pulse Induction. Every ML PI from the SD2000 through to the GP 5000 uses an Integrator as a Null Summation / Averaging means.
Perhaps you would like to explain to the members how an Integrator and samples can be used to create a null summation in the "frequency domain".
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kazza
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« Reply #198 on: Friday September 16 2016 07:05:13 AEST AM »

Bugwhiskers,

Actually, as has been pointed out on this forum by another member, and shown on Geotech, Eric’s detectors do not use different widths of samples to either GB or cancel static fields.

Also, as shown in numerous scientific papers kindly provided by Doug, all soils magnetic components have both VRM and a non-VRM component, where non-VRM means a “log-uniform” reactive magnetic permeability from soil ferrites (note reactive, not resistive), and this is shown as a graph with the independent variable on the x-axis being a logarithm of frequency, versus a dependent variable being magnetic permeability on a linear scale y-axis. The non-VRM log-uniform distribution is basically that of an ideal ferrite and has a zero slope. A log-uniform reactive distribution magnetic permeability should give no Rx signal during a PI Rx period (no decay, literally zero).

“Doug’s” papers also explain that the VRM component soil signal causes the decay seen during the Rx period in PI, and is from log-uniform Resistive permeability (note log-uniform “resistive,” not “reactive”). The papers also show that a log-uniform resistive soil has an associated log-linear reactive component. A log-uniform resistive permeability, or, saying the same thing in a different way, log-linear reactive, is the standard literature model for the soil VRM Rx signal and gives "Eric's" 1/t decay rate of change of Rx magnetic field for an ideal Tx magnetic step.


Hope this helps.
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bugwhiskers
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« Reply #199 on: Friday September 16 2016 07:52:07 AEST AM »

kazza, thankyou for the techno waffle but I would have preferred a direct answer to my direct question.


  

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