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#51

Reg Wilson
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Joined: 06 September 2017
Posts: 721
Member
12 September 2020 06:23 pm

Aussiedigs, I am in the process of putting together a test patch on my property (on which I have detected gold) and will be able to post some comparisons with not only different coils, but also different detectors. I will post results as they become available.


Walmer Central Victoria
Began detecting 1979 Best colour 3Kgs Best patch 340 ozs.

3 users like this post: Aussiedigs, greyhound, Rush

#52

markrich73
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Joined: 31 January 2020
Posts: 11
Member
13 September 2020 08:30 pm

Just a quick update on my misbehaving QED. Howard very kindly took a look at it during the week and found a dry joint on one of the components on the Rx side of the PCB. He resoldered it and the machine is now behaving properly - I haven't had to ground balance above 170 in any of the spots I've been to since and I'm now digging the shotties I missed over the last couple of weeks (but no more gold sadly). Many thanks to Howard - he was super generous with his time, energy and know-how!!

5 users like this post: XLOOX, grubstake, mbasko, Northeast, davent

#53

mbasko
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From: Central West NSW
Joined: 27 January 2015
Posts: 4,508
Member
13 September 2020 09:20 pm

markrich73 wrote:

Just a quick update on my misbehaving QED. Howard very kindly took a look at it during the week and found a dry joint on one of the components on the Rx side of the PCB. He resoldered it and the machine is now behaving properly - I haven't had to ground balance above 170 in any of the spots I've been to since and I'm now digging the shotties I missed over the last couple of weeks (but no more gold sadly). Many thanks to Howard - he was super generous with his time, energy and know-how!!

Good result Markrich!
Bet that Sadies a tad more sensitive now thumbsup


Everything we use comes from mining or farming.

#54

davent
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Joined: 01 September 2015
Posts: 3,019
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13 September 2020 09:55 pm

Howard has a heart of gold, a genuinely nice gentleman, and a bloke who has integrity.

1 user likes this post: pinfire opals

#55

markrich73
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Joined: 31 January 2020
Posts: 11
Member
14 September 2020 03:43 pm

I still haven't got the EMI situation sorted out on the Sadie. I can't seem to calm the wobbling threshold and spurious spikes in the areas I've been detecting regardless of mode, gain and SMR settings. This has quite an impact on its sensitivity to small gold. How do the Coitech Commander 8" and 11" Elite compare? Are there any other coils less susceptible to EMI?

#56

XLOOX
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From: Inglewood Fault, QLD
Joined: 21 August 2019
Posts: 77
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14 September 2020 04:35 pm

I just went out into my home paddock (street power lines 25m away & HV transmission lines 200m away) and with GB 125-130, THSB null, THSA 60 Gain 8 mode 1 for Sadie & gain 6 mode 2 for 14 x 9 evo, The Sadie was very usable - just a spike every 30 sec or so & the Evo was sl chattery & spike every 15 sec or so. Still usable, just not perfect. Both picked up 1 grain no prob.

For EMI rejection a bundle wound coil like Sadie should be better than than full spiral wounds ( Elite, Evo). Also the bigger the coil the better the antenna so all else being equal a 6x8 should pick up less EMI than a 8 round or 11..... and way less than a 20

Are you sure it is EMI? - If you have set THSB null and THSA say 30 & hold the detector rock steady coil on ground or horizontal ie coil way above ground does it still carry on ? If still spurious noises then ok, sounds like EMI. Do you have powerlines very nearby? If not then Hmmm....

I wouldnt be looking for the solution in a new coil just yet. Do you have any remoter spots that you would be sure have no EMI that you can check out ?

Last edited by XLOOX (14 September 2020 04:44 pm)


1985-2005 Garretts ADS Deepseeker x 2- now THATS a slow learner !
2017-current Whites TDI SL 16V, Sadie,TRX 2020 - 14x9 Evo,Makro Gold Kruzer, QED PL3

2 users like this post: grubstake, mbasko

#57

mbasko
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From: Central West NSW
Joined: 27 January 2015
Posts: 4,508
Member
14 September 2020 06:26 pm

Is SMF at the preset of 50?
SMR preset of 107?
If not reset them to the preset values & try again.
The QED is fairly EMI resistant as far as PI detectors go but not totally immune to it.
With a small coil & no abnormal EMI you shouldn't need to play with those settings much if at all.

A big coil/big swings may need some SMF adjustment or if near off frequency 50hz power lines, microwave towers, 2 way radio transmissions or similar EMI sources then some SMR adjustment may reduce them.
Unfortunately neither is a magic bullet in rejecting bad EMI & won't help at all against natural/atmospheric sources i.e. lightning storms that could be hundreds of km's away.

If EMI is indeed the cause & SMR adjustments do not help then I doubt a change of mono coil will help.
You could try a DD coil or anti interference coil but they also come with some loss in sensitivity. Back to square one.

I doubt that the issue is with the coil. Either you have a nearby EMI source that SMR isn't helping with (electric fence, phone tower, air traffic, HV powerlines etc.) or there could be further issues with it?


Everything we use comes from mining or farming.

2 users like this post: XLOOX, pinfire opals

#58

markrich73
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Joined: 31 January 2020
Posts: 11
Member
14 September 2020 08:53 pm

Hmmmm..... something still sounds squiffy. SMF was at 50 and SMR at 107. No powerlines, electric fences or air taffic close by today, but there were a few houses within a 1 km radius. I did about 10 factory resets to try and figure it out, but the threshold warbled all over the place regardless of what I did. I was in a valley last night where it ran slightly quieter, but it still didn't give a clean threshold.

I'm hitting smaller targets than I was previously, but it's tough going!

#59

grubstake
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From: Perth, WA
Joined: 20 October 2014
Posts: 2,579
Member
14 September 2020 09:07 pm

Is it possible that your mobile phone and/or pinpointer are causing the interference?


Where it is, there it is.

#60

markrich73
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Joined: 31 January 2020
Posts: 11
Member
14 September 2020 09:33 pm

I've been turning my phone off and I don't have a pinpointer.

Wish I had another coil to test - one of those X Coil 6x12"s would be just the ticket right now. smile

#61

Northeast
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Joined: 27 August 2016
Posts: 1,328
Member
14 September 2020 09:48 pm

SMR - preset is 107 as you know. I have played with that a bit and have found that in my area setting it at 100 is better. I can't remember which but 104 or 105 makes it go nuts. Worth making your way through a few numbers to see if anything helps.

What is your Null markrich?

And what are you running your Gain at? I had issues getting my Gain beyond 2 or 3 before it went mental. Sent back to Howard (stupidly I waited for too long before doing that). He re-did all the solders and it fixed it perfectly. Can run Gain 6-10 now depending on coil and where I am.

Cheers, N.E.

#62

markrich73
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Joined: 31 January 2020
Posts: 11
Member
14 September 2020 11:28 pm

Thanks Northeast - it's great to hear you got it sorted. Null on my machine is 45. I was running gain 5, mode 1 today, although it didn't seem to matter if I raised or lowered gain or mode - it ran super noisy in all of them. I'll see if Howard might have another looksee...

#63

Aussiedigs
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From: Beechworth
Joined: 26 April 2019
Posts: 388
Member
15 September 2020 09:03 pm

Mark, are you sure your null is at 45? Not impossible but does seem to be a little low. Too far below null will give you noise. Recheck GB and null after 20 mins of run time.


QED PL2, trim, taught and terrific!

1 user likes this post: pinfire opals

#64

markrich73
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Joined: 31 January 2020
Posts: 11
Member
15 September 2020 11:13 pm

Hey Aussiedigs, yeah null is definitely 45. Howard recalibrated a few things last week after resoldering the dry joint and it changed from 50 down to 45 in the process. I'll ask him to bump it back up to 50 if he's got the time. It's not a huge issue, but the usable window of THS B values has narrowed, so I now need to be quite precise when setting it. I've been constantly checking null as I'm going.

1 user likes this post: Aussiedigs

#65

Aussiedigs
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From: Beechworth
Joined: 26 April 2019
Posts: 388
Member
16 September 2020 10:12 am

Mark, 45 or 50, it doesnt matter as its just a number. Your null at 45 will be no different to my null at 51 (which originally was 50)


QED PL2, trim, taught and terrific!

#66

markrich73
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Joined: 31 January 2020
Posts: 11
Member
19 September 2020 11:40 pm

Just an update on EMI with the Sadie. I spoke with Howard and he said the QED was designed for use with the speaker, so with headphones you’ll hear every little wobble from ground noise and EMI. I can definitely hear it far more through headphones than the external speaker. To run comfortably THS B needs to be to be set at, or close to null and THS A turned down until comfortable. My Sennheiser HD25’s have good dynamic range and seem to be super sensitive to every little noise. I tried running with the external speaker today and it was a much quieter, more stable experience …although I feel conspicuous chirping my way through the bush.

If you’re experiencing EMI and wondering whether it’s caused by the coil or machine, Howard said disconnect the coil from the machine and listen if you’ve got a clean threshold without it. If you’ve still got a noisy threshold, it’s internal EMI, which means you’ve probably got dry joints on the PCB and you should book it in with him to resolder them. If the threshold is clean without the coil, but noisy with it connected, it’s just the coil acting as an antenna and picking up surrounding electromagnetic signals as you’d expect. My machine’s threshold is nice and flat when disconnected, so the EMI is being picked up from the Sadie, which is a relief, but I need to figure out the best settings for use with my headphones so I can hear tiny target signals within the surrounding noise.

Howard also said that a few people have mentioned that they’re experiencing higher than usual EMI lately. He’s not sure why, but perhaps it’s something to do with Elon Musk’s increased activity in space. I’m actually wondering if it has something to do with the new solar cycle? Either way, not great news for quiet running machines.

(@ Aussiedigs, Howard said the same as you - that the number on the screen for null is irrelevant as long as you’re able to null …so 45 it is on mine. ?)

1 user likes this post: Aussiedigs

#67

Northeast
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Joined: 27 August 2016
Posts: 1,328
Member
19 September 2020 11:50 pm

Thanks for the update.

Interesting that there is a threshold at all when the coil is disconnected. I just thought there would be nothing, although have never really thought about it.

I’ve had the Detech Ultra Sensing coil out on mine several times in the past few weeks and no EMI issues. Ran Mode 1, Gain 10 for a while today with no trouble. Don’t think it’s Elon wink

1 user likes this post: pinfire opals

#68

XLOOX
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From: Inglewood Fault, QLD
Joined: 21 August 2019
Posts: 77
Member
20 September 2020 12:38 pm

I know exactly what you mean by the difference between using a sensitive set of earphones vs an external speaker on the QED. Even though the Logitech X50 is louder it is even less sensitive than the original QED external speaker (Nokia MD11) but using either of those external speakers is like having squelch turned right up on a CB radio - you need a fair signal to hear anything. Pretty much any headphone is more sensitive but even the sensitivity difference between various earphones/headphones can be amazing.

I know that a wobbly threshold with little spikes can be fatiguing and distracting but by using the X50 external speaker you are losing a lot of the information the QED is telling you - especially info about faint targets.

As Howard has said in other forums, when passing over a target you get a pitch change way before you get the volume change and that pitch change can give you upto 30% deeper on small targets. I have tested it & its true so I have actually been trying to amplify the faint signals and just accept any threshold stability loss.

I have a box of old earphones & tried out about 20 pairs of various audio earphones ( sennheiser, bose, no name) & 6 pairs of headphones ( UR-30, Sunray Gold Pro, DC H10-13.4..) and the best by far was a noname one followed by KZ-ZST earbuds.

I also got a very cheap & light, long lasting headphone amp that I velcroed to the side of the QED. From a hifi perspective it is a truly crappy amp but perfect for lifting the sound level of the threshold just enough for my liking.

Personal choice - set up for beep & dig or set up to listen to the light sabre like whoo-whoo and figure out what it is telling you. Either way it's pretty good.

1600565522_headphone_amp.jpg

Last edited by XLOOX (20 September 2020 01:35 pm)


1985-2005 Garretts ADS Deepseeker x 2- now THATS a slow learner !
2017-current Whites TDI SL 16V, Sadie,TRX 2020 - 14x9 Evo,Makro Gold Kruzer, QED PL3

1 user likes this post: Aussiedigs

#69

Rush
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Joined: 22 May 2015
Posts: 198
Member
21 September 2020 10:39 am

Reg Wilson wrote:

Aussiedigs, I am in the process of putting together a test patch on my property (on which I have detected gold) and will be able to post some comparisons with not only different coils, but also different detectors. I will post results as they become available.

There have been some results by Reg on another forum.

#70

Adrian ss
Member
Joined: 08 December 2018
Posts: 142
Member
28 September 2020 09:47 am

Has anybody here found good gold with the QED?
I am cinsidering getting a QED . People posting here seem to be having issues with the machine. True or false or mainly finger trouble??

#71

pinfire opals
Member
Joined: 16 February 2019
Posts: 338
Member
28 September 2020 03:56 pm

Adrian ss wrote:

Has anybody here found good gold with the QED?
I am cinsidering getting a QED . People posting here seem to be having issues with the machine. True or false or mainly finger trouble??

90% of Qed users are posting finds on facebook, more of a look at me thing and how many likes did I get. Alot of gold pictures have been posted last 12 months Adrian.

#72

Adrian ss
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Joined: 08 December 2018
Posts: 142
Member
28 September 2020 06:30 pm

Okay no worries. Thanks.
Unfortunately I do not use Face book.

1 user likes this post: pinfire opals

#73

pinfire opals
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Joined: 16 February 2019
Posts: 338
Member
29 September 2020 02:33 am

Adrian ss wrote:

Okay no worries. Thanks.
Unfortunately I do not use Face book.

Il see if i can steal a few of the pics from there and transfer to here. thumbsup

#74

pinfire opals
Member
Joined: 16 February 2019
Posts: 338
Member
29 September 2020 03:08 am

Here is some from last 6 months Adrian.1601309184_118884683_3636272426397112_1599420310493849202_n_1.jpg1601309206_119067253_3636272529730435_1809105750508324566_n.jpg1601309226_119214269_3563985080302814_7485224448514586922_n.jpg1601309246_118769827_3186893334726924_388312455799305632_o.jpg1601309262_118489751_3181900208559570_459571770445899625_o.jpg1601309279_118771770_3178476985568559_2160581774814451980_n.jpg

1 user likes this post: grubstake

#75

pinfire opals
Member
Joined: 16 February 2019
Posts: 338
Member
29 September 2020 03:10 am

1601309309_118777402_10158798839304166_8975381511224331191_n.jpg1601309329_118410152_205393177588781_5693246831270566907_n.jpg1601309373_109877435_10157233318971817_3460360457046602192_o.jpg1601309388_117237539_3458399327528057_3543277654025472497_n.jpg1601309404_108634966_10158382289862999_208654157107988032_o.jpg1601309421_104834318_10163685830750721_315425366241697688_o.jpg

1 user likes this post: grubstake

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