northwest QED vs 4500
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australian electronic gold prospecting forum.com  |  QED users  |  QED users (Moderator: bugwhiskers)  |  Topic: QED vs 4500 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: QED vs 4500  (Read 971 times)
mylab
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« on: Tuesday September 17 2019 01:35:58 AEST AM »

I read some test results, be them in air above the coil, using a 50c coin and a 4500 set in Enhance with an 18" mono = 63cm, 15" Evo = 64cm  & 19" Evo = 65cm and they were all fairly similar.

Therefore I am curious with what size mono coil and settings on the QED would be required to produce a similar result with the 50c coin?

Goldman if possible could you do the same test with your QED.
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Goldman
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« Reply #1 on: Tuesday September 17 2019 08:38:42 AEST AM »

  
I read some test results, be them in air above the coil, using a 50c coin and a 4500 set in Enhance with an 18" mono = 63cm, 15" Evo = 64cm  & 19" Evo = 65cm and they were all fairly similar.

Therefore I am curious with what size mono coil and settings on the QED would be required to produce a similar result with the 50c coin?

Goldman if possible could you do the same test with your QED.
I’m going out to the Maryborough test site this week so will try it out and let you know

Cheers Goldman
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mylab
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« Reply #2 on: Wednesday September 18 2019 00:47:42 AEST AM »

  
  
Therefore I am curious with what size mono coil and settings on the QED would be required to produce a similar result with the 50c coin?

Goldman if possible could you do the same test with your QED.
I’m going out to the Maryborough test site this week so will try it out and let you know

Cheers Goldman

I appreciate that Goldman.

Maybe you could also share the results of your planned test at the Marybourgh test site. Also in regards to that 5oz lead test target at that site there seems to be some confusion at what depth it was buried at as I had read it is actually at 26”.

One thing that is annoying with testing & results is when there is very little mention of the major settings on the detector that were used such as Search Mode, Soil Timing, Coil/Rx, Gain, Stabilizer, Audio Type for the GPXs. Then you have on the GPZ Gold Mode, Ground Type, Sensitivity, Volume, Audio Smoothing. However if Factory Default settings were mentioned then all of the above is known which had been mentioned for the results in my previous post with the GPX4500 although no mention of which Search mode although I believe it was set in Deep.

At least with the QED there appears to be 4 major settings that need to be of mention THS-B,THS-A, Gain & Mode which makes it less complicated. 

Therefore I look forward to your air test results with the QED & 50c coin and with what coils used.
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bugwhiskers
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« Reply #3 on: Wednesday September 18 2019 06:07:27 AEST AM »

Of greater interest to potential buyers are the video links below.

Consider this,

The QED is less than half the price of the SDC.
The QED is lighter than the SDC.
The QED has 5 year warranty vs 3 years for the SDC.

  

The QED has vastly superior EMI rejection.
The QED can use a much larger range of aftermarket coils.

Notice the Sickening Deafening Cacophony of EMI from the SDC.
  


  





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GARY
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« Reply #4 on: Wednesday September 18 2019 09:50:35 AEST AM »

Actually BW I came across several video tests at the Laanceoorie test site on the Detectronics Australia website displaying video tests with the SDC and GPX.

Although these detectors in the videos had been modified I think by a member here Mick “Mechanic” then in this particular video “Modified SDC 2300, 50 cent piece @ 12 inches w/ 12" Nugget Finder Coil” the testing fellow (not sure if he is Mick) said not all coils run on a standard SDC as it is quiet fussy and the NF 12” Advantage coil he used is about the biggest you can run on a standard SDC. He also displays in further SDC tests videos with the modified SDC using a NF 18” & 16” coil on the 50c coin and another test out in the field with the modified SDC with an NF18" coil on a Beer Can under the ground at 1 metre depth.

The thing that stands out is the SDC’s erratic threshold and he explains it due in his video tests to feedback from the internal speaker however many YouTube videos that I have viewed online the SDC does display an erratic threshold.  

Gary.
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bugwhiskers
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« Reply #5 on: Wednesday September 18 2019 10:02:51 AEST AM »

  

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« Reply #6 on: Wednesday September 18 2019 10:37:47 AEST AM »

Considering that the SDC is a redundant and re-badged cheap  land mine detector the RP is outrageous.It would seem that the RP is to be increased further. ML don't even have the decency to rectify some of the well documented serious ergonomic problems with the SDC to justify  the increase in price!!!!
doug smile
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« Reply #7 on: Wednesday September 18 2019 10:51:42 AEST AM »

Some enterprising individuals are making (3d printed) legs and speaker horn for the SDC. Why couldn't the manufacture make good/provide these "shortfalls" ?
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GARY
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« Reply #8 on: Wednesday September 18 2019 12:39:06 AEST PM »

Btw I hope Mick " Mechanic" does not mind me making reference to his testing here as from what I have read and been told he is a top fella and very switched on at what he does including repairing the Lithium batteries and ML detectors if the need arises.

Gary.
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dasenator777
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« Reply #9 on: Wednesday September 18 2019 14:36:35 AEST PM »

  
Btw I hope Mick " Mechanic" does not mind me making reference to his testing here as from what I have read and been told he is a top fella and very switched on at what he does including repairing the Lithium batteries and ML detectors if the need arises.

Gary.
im pretty sure thats ( au-man ) over on pa forum, have been following that sdc mod thread hes on. reg knows him pretty well from memory.
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GARY
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« Reply #10 on: Wednesday September 18 2019 16:06:33 AEST PM »

  

im pretty sure thats ( au-man ) over on pa forum, have been following that sdc mod thread hes on. reg knows him pretty well from memory.


Oh!....so I assume then that the fella testing in the videos is not Mick "Mechanic" and maybe Mick has nothing to do with Detectronics Australia?

Gary.  
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« Reply #11 on: Wednesday September 18 2019 17:30:25 AEST PM »

  
  

im pretty sure thats ( au-man ) over on pa forum, have been following that sdc mod thread hes on. reg knows him pretty well from memory.


Oh!....so I assume then that the fella testing in the videos is not Mick "Mechanic" and maybe Mick has noting to do with Detectronics Australia?

Gary.  that i couldnt tell ya gazz sorry
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GARY
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« Reply #12 on: Wednesday September 18 2019 19:16:02 AEST PM »

  

Gary.  that i couldnt tell ya gazz sorry


Thanks D777.

It has been a long time since Mick "Mechanic" had posted here on this site.

I see "AuMan" signs off with Mick as well over on P'inOz forum.

Anyway I have deviated away from the subject of this thread, sorry Goldman.

As far as I am concerned when detecting with my QED PL2 out on the goldfield with my Commander 8" mono it would nothing behind for an SDC with its 8" coil.

Gary.  

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GARY
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« Reply #13 on: Saturday September 21 2019 14:21:48 AEST PM »

An air test in the backyard with my QED PL2 with my Commander 8"  mono using a 50c coin and testing several different settings, the best was THS-B(6 above Null) THS-A:30 GAIN:6 MODE:1 which produced the best result on the 50c coin at 35.5cm or 14". Raising the GAIN to 10 produced 15" allowing more EMI in and ground noise if I attempted to detect over the ground.

Leaving THS-A on 30(FP) allowed me to raise THS-B to 6 above Null for a falling response target (large target) that the 50c coin would represent as when I tested a 3oz nugget the response and distance was identical to the 50c coin.

Gary.
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Goldman
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« Reply #14 on: Saturday September 21 2019 17:24:13 AEST PM »

Well I have tested a QED and a 45 with both a 50c Australian coin and a 1oz gold nugget in the goldfields around Maryborough, vic.

In both cases the 45 achieved greater (air test) depth.
———————————————-
GPX4500 with 19” EVO
The experienced 45 user runs his very hot, using a SP01 audio enhancer with headphones
* enhance
* gain=15, max in a 45
* Search mode=general
* Audio=deep
* Stab=11
* Motion=v slow

50c coin=63cm
Gold=46cm

When reducing settings to more normal settings, the following was achieved:
* Enhance
* gain=9
* Search mode=deep
* Audio=deep
* Stab=11
* Motion=v slow

50c coin=58cm
Gold=40cm
——————————————
QED using the standard speaker:
achieved 4cm less on the gold than the 45 using the 19” EVO, however only 2cm less using when using the 11” elite.

Not sure what difference using a SP01 audio enhancer with headphones on the 45 Vs the QED standard speaker made to the results.

with 19” EVO
A=30
B=6 above NULL
G=10
Mode=4

Depth
50c coin=34cm
Gold=36cm

QED with 19” EVO
A=85
B=1 above NULL
G=10
Mode=4

Depth
50c coin=34cm
Gold=36cm
———————————————
QED with 11” elite
A=85
B=2 above NULL
G=10
Mode=2

Depth
50c coin=34cm
Gold=38cm


QED with 11” elite
A=30
B=6 above NULL
G=10
Mode=2

Depth
50c coin=34cm
Gold=36cm

For some reason the 11” elite achieved greater depth than the 19” EVO, getting close to the 4500 depth on the 1oz nugget.

Testing the QED with a 14” elite, using settings A=30; B=5 above NULL achieved 37cm on the 1oz gold, less with a high A and low B.

Cheers Goldman
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mylab
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« Reply #15 on: Sunday September 22 2019 00:50:40 AEST AM »

Goldman thanks for the information that you have provided from your test results with the QED.
Gold is difficult to gauge when I look at your 1oz piece results and Gary’s larger in weight 3oz piece result.
As to the 50c coin results, for some reason they were the same for both the 19” Evo and 11” Elite and Gary’s 8” coil was a little better, again for some reason.
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Blip
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« Reply #16 on: Sunday September 22 2019 08:12:30 AEST AM »

I dont have a 1oz gold nugget but i may try the air test with a 50c piece with a Minelab 11” mono and a 20” NF Advantage.

Goldman, did you wave over with the target on the ground or over above the coil?
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GARY
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« Reply #17 on: Sunday September 22 2019 09:49:32 AEST AM »

Blip for my test results, after a GB and resting the coil back on the ground, I then had to tilt the 8" coil into the vertical position to negate EMI and wave the target parallel with the ground out in front from the bottom of the coil for a very faint target response.

Be interesting what your results show using the 50c coin with those two coils as gold nuggets are so variable by nature.

And thank you for your reply to my 18650 Battery question in that other discussion.

Gary.
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« Reply #18 on: Sunday September 22 2019 10:32:57 AEST AM »

Yeah no probs Gary.

I havent checked the longevity of the 3400ma’s against the Nexcell 2600ma’s as my detecting has been intermittent.

Interesting you have had to test with the coil perpendicular to the ground!

Also interesting is the distance difference with the 1oz nugget! Could we see a difference in ground and with a different coil as some detectors prefer some coils over others?

Al.
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GARY
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« Reply #19 on: Sunday September 22 2019 11:15:30 AEST AM »

  

Also interesting is the distance difference with the 1oz nugget! Could we see a difference in ground and with a different coil as some detectors prefer some coils over others?

Al.

Yes and as I said a gold nugget is different by its nature, be its Shape and Dimensions, Solid or Prickly surface, other metal content & etc.

As far as coils preferring one detector over another then I would have to say No due to the parameters they are built too to operate although I expect if one was to build their own coils a certain leeway is possible.

The pic I had attached is the nugget I used for the tests in between two other test targets that I have used. Actually all three produce a similar depth response on my GPX5000 in Normal timing however when switched to Fine Gold timing the Copper test piece drops in depth compared to the Gold and Lead.

And for the record the Copper penny produces extra depth than a 50c coin.

Gary.
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