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#26

condor22
Member
From: Adelaide, SA
Joined: 16 December 2013
Posts: 2,344
Member
06 August 2020 12:11 pm

I got one for my last trip to VIC from Nenad (Still isolated back in SA) Only got a couple of chances to try it before hightailing it back home 10 days ago. First impressions, very quiet running it in DD - Normal. I found it a little unstable in Special Fine Gold when in mono, but the ground was noisy. Dropping Rx a little helps. In enhance/mono it was very stable.

I agree with the skid plate - I tried it with the open plate and yes twigs can get caught. I also tried the closed skid plate, but found the uneven surface trapped and "knocked" worse than the open one causing false signals. So, a flat skid would be the go.

I'm thinking the easiest solution is to get a sheet of ABS, cut to suit and glued under the closed skid plate. But would also look at what weight it adds. However given the coil is lighter than comparable 18" coils by 0.5kg, I don't think it would be heavier than them.

Looks like it will be next year before another GT trip, so I'll try to get out to Mt Crawford. (Maybe Nenad will invite me to join him, hint, hint. smile )

3 users like this post: mbasko, Jaros, ProspectorPete

#27

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 5,400
Member
06 August 2020 06:43 pm

Got mine rigged up on a longer Coiltek lower shaft.
Gave it a run for a couple of hours today. Agree that the "closed" skid plate does snag in rocky areas a bit or on sticks. Condor I was thinking while out today about getting a sheet & closing it in fully. Might even get inventive & try to just form some bits to fill the holes? I doubt it would add any noticeable weight - it's so light now.
It wasn't a huge deal but it would glide much better fully closed in.
Other than that (& apart from no gold today) it ran great. Stayed in DD mode & normal most of the day
Tried mono on a faint target & preferred the signal in DD (ended up being a small boot tack) - will play around with that some more yet.
Found an area of wet clay where I got some ground signals in normal/DD so tried Sensitive Extra & Enhance both in DD & they seemed to be no better. Dropped the gain down a couple of notches & normal/DD still seemed to be the best option. Didn't try mono & no doubt lots of trial + error to go yet but it's good to have a lot of options using it.
Had a bit of EMI with the NF Evo but it was pretty much non existent with the Concentric on. Even had a plane go over & didn't get any noise from it at all - that's not like the GPX lol
All up very happy with it, can't wait to get onto some more suited areas.


Everything we use comes from mining or farming.

2 users like this post: Jaros, ProspectorPete

#28

Jaros
Moderator
From: S.E.Qld., QLD
Joined: 11 August 2013
Posts: 15,495
Moderator
06 August 2020 07:03 pm

Thanks for your test results fellas. I'm sure it will get a lot of us interested. I still have to try my big detech DD. I only have one vertebra spare for flexibility the rest are titanium. BUT i'm going to go to Warwick staying at the Glendon Cara Pk. before the end of this year.---tic tic 6yrs now.
I think my l'il Sadie and the big detech should do well. smile


F1A4M2, GPX4500, Exterra 705 Gold, Ace 250, Goldrat 8" Dreammat River Sluice.

#29

OzzieAu
Member
From: Adelaide
Joined: 04 November 2014
Posts: 1,610
Member
06 August 2020 07:37 pm

That’s what I have done with mine Condor... spot glued a sheet of ABS to the bottom of the closed skid and then taped around outer edge.... seems to do the trick. It is noticeably heavier though than just the open skid, which would be ok in open terrain.
If Detech come up with a flat skid, I’d grab one in a flash.
1596703032_6291c0db-7154-43cd-bf75-af31423d12fc.jpg


GPX5000..2xEvo’s..Detech 18CC...Multi Kruzer.. Simplex +...ProFind.. PulseDive, etc.

2 users like this post: mbasko, ProspectorPete

#30

condor22
Member
From: Adelaide, SA
Joined: 16 December 2013
Posts: 2,344
Member
06 August 2020 11:24 pm

Jaros wrote:

Thanks for your test results fellas. I'm sure it will get a lot of us interested. I still have to try my big detech DD. I only have one vertebra spare for flexibility the rest are titanium. BUT i'm going to go to Warwick staying at the Glendon Cara Pk. before the end of this year.---tic tic 6yrs now.
I think my l'il Sadie and the big detech should do well. smile

Jeez Jaros, you're a detectorist's walking nightmare, lol. Extra long shaft for you eh. smile

I'm thinking how to flatten the skid plate, in another working life I got into the design of vacuum formed ABS product and tooling, but not sure it's a backyard ability.

As I'm probably never going to use the solid skid plate as is, I'm thinking to cut out the solid parts, leaving the coil wrap around and glue a flat piece underneath. With a similar thickness ABS the wight will be only a few grams heavier.

#31

dirtdiggin
Member
From: Brimin
Joined: 09 June 2014
Posts: 162
Member
12 August 2020 09:02 pm

mbasko wrote:

Was tossing up between getting a bigger DD coil or trying the Detech 18" concentric.
The concentric coil has had me intrigued for a while now & looks to have some good qualities +"versatility in mono or DD mode so in the end I took the plunge.
https://www.prospectingaustralia.com.au … 758980.jpg
Can't wait to try it out & have a few places I'm hoping it will do great in.
Looks good - very lightweight but also well built. Kinda looks small for an 18" coil without the solid skid plate on it.

Thanks Nenad - 1st class sales & delivery as always thumbsup

Hi mbasko

So what’s the black bit on the coil is that the skid plate??.
Cheers

#32

dirtdiggin
Member
From: Brimin
Joined: 09 June 2014
Posts: 162
Member
12 August 2020 09:40 pm

PhaseTech wrote:

Pete's video going across some targets on a test patch, posted in another thread, but some may not have seen it:

Hi Nenad
So in the video it looks like the targets are getting picked up from the inner circle of the coil is this the case ? As it seem odd buying a 18” that really is only useful as a 8” .

1 user likes this post: A-team

#33

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 2,178
Phase Technical
12 August 2020 11:20 pm

When in DD on the coil switch, the coil operates as a Concentric, so yes you get very sharp detection more like a small mono. But you get more punch compared to an 8" mono, and handles bad ground better. But when you switch to Mono, it behaves more closely to an 18" mono. So this switching ability is what makes it unique.


Agent for Minelab, Nugget Finder, Nokta Makro, Quest, Detech, SteelPhase - Phase Technical Website
Digging with PhaseTech on YouTube

#34

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 5,400
Member
13 August 2020 09:14 am

dirtdiggin wrote:
mbasko wrote:

Was tossing up between getting a bigger DD coil or trying the Detech 18" concentric.
The concentric coil has had me intrigued for a while now & looks to have some good qualities +"versatility in mono or DD mode so in the end I took the plunge.
https://www.prospectingaustralia.com.au … 758980.jpg
Can't wait to try it out & have a few places I'm hoping it will do great in.
Looks good - very lightweight but also well built. Kinda looks small for an 18" coil without the solid skid plate on it.

Thanks Nenad - 1st class sales & delivery as always thumbsup

Hi mbasko

So what’s the black bit on the coil is that the skid plate??.
Cheers

Yep that's with the closed skid plate fitted.


Everything we use comes from mining or farming.

#35

thefitter
Member
From: mackay, QLD
Joined: 12 November 2016
Posts: 59
Member
16 November 2020 06:53 pm

PhaseTech wrote:

When in DD on the coil switch, the coil operates as a Concentric, so yes you get very sharp detection more like a small mono. But you get more punch compared to an 8" mono, and handles bad ground better. But when you switch to Mono, it behaves more closely to an 18" mono. So this switching ability is what makes it unique.

What’s the deepest gold you found with it nenad

Ian

#36

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 2,178
Phase Technical
17 November 2020 07:53 pm

I've hardly used one, so no gold yet. Basically haven't had access to one. Sounds strange I know, being a Detech agent, but stock has been thin on the ground.
My first demo coil was snapped up as I couldn't get any new ones at the time. The last 2 that came in sold within a few days.

Would like to do some more work with one, as they are very light, and nice and stable.


Agent for Minelab, Nugget Finder, Nokta Makro, Quest, Detech, SteelPhase - Phase Technical Website
Digging with PhaseTech on YouTube

1 user likes this post: thefitter

#37

condor22
Member
From: Adelaide, SA
Joined: 16 December 2013
Posts: 2,344
Member
17 November 2020 11:07 pm

PhaseTech wrote:

I've hardly used one, so no gold yet. Basically haven't had access to one. Sounds strange I know, being a Detech agent, but stock has been thin on the ground.
My first demo coil was snapped up as I couldn't get any new ones at the time. The last 2 that came in sold within a few days.

Would like to do some more work with one, as they are very light, and nice and stable.

Ask me nicely and I might meet up with you Nenad. smile On a cooler day, when we have one lol....

#38

StayyerAU
Member
Joined: 30 March 2019
Posts: 401
Member
08 January 2021 04:23 am

G'day

Has anyone used one of these concentric coils over here in WA?, I only use mono coils but would like something different to go over some old areas, and one spot in particular that produced some decent nuggets, all were very vague responses even though it turned out they were not deep, still have the feeling that more are hiding there.

Also possibly if someone has the camo version 18" round that they would like to sell?

cheers

stayyerAU

1 user likes this post: A-team

#39

mlee76
Member
From: nth qld, QLD
Joined: 30 March 2021
Posts: 11
Member
02 April 2021 05:57 pm

I bought a new one late last year and it came with both spoked and closed skid plates. The closed skid plate is quite drummy. I preferred the spokes one.

#40

Upside
Member
Joined: 15 April 2017
Posts: 844
Member
02 April 2021 06:59 pm

I've had a lesson with Nenad. Great teacher, nice guy, lots of knowledge. thumbsup

2 users like this post: ProspectorPete, A-team

#41

condor22
Member
From: Adelaide, SA
Joined: 16 December 2013
Posts: 2,344
Member
02 April 2021 10:44 pm

I'm heading over in a few days with mine. Did a mod to the closed skid plate, by gluing a flat disk on the underside. Will let you know how it works. I tried it briefly in some scrub last year with the closed skid plate un modded and found I got a lot of scraping on pebbles n twigs making it difficult to swing on the ground. If the mod works, great, if not will go back to the open plate.

1 user likes this post: A-team

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