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#1

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 1,872
Phase Technical
13 February 2019 04:03 pm

Thought I'd start a fresh thread on the Nokta Impact to focus on factual info, tips and good videos from the field.

I still love my Impact, and despite the fact that newer machines have come out since the Impact release, at around $1000 retail now, I still think it's a lot of detector for the money. It's probably my favourite non-waterproof VLF unit. Why? A short summary:

1. Solidly built
2. Great menu layout, and all settings out in front of you, in English
3. Runs on 4 x AA's easily accessible from the back, with long run time.
4. Handle angle perfect and very nicely textured
5. Excellent arm cuff
6. Internal coil cable - great for working scrubby areas
7. Huge coil selection
8. Beep or VCO (modulated) disc modes
9. Excellent all-metal mode with iSat (very stable)
10. Adjustable audio Boost
11. Built in wireless
12. High and low Gain Disc modes, great for mineralised soils
13. Three frequencies and freq shift
14. Built in Vibrate function
15. Adjustable tone breaks and Ferrous Volume
16. Adjustable back light, both time-out or constant options
17. Analogue Volume control
18. Built-in search light

1550034686_nokta-impact-detektor_sml.jpg

Basically, there isn't much it can't do. Sure there are deeper units for wet sand beach use, and more sensitive units for gold hunting, but the Impact can do very well at almost any task.

Last edited by PhaseTech (13 February 2019 04:11 pm)


Agent for Minelab, Nugget Finder, Nokta & Makro, Quest, Detech, SteelPhase - Phase Technical Website

5 users like this post: Ded Driver, ProspectorPete, pagan prospector, Dolphin, AngerManagement

#2

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 1,872
Phase Technical
13 February 2019 04:05 pm

Here's a good video showing how well it handles beer bottle caps, using the small 7" concentric coil.
In Dutch but with subtitles:


Agent for Minelab, Nugget Finder, Nokta & Makro, Quest, Detech, SteelPhase - Phase Technical Website

2 users like this post: ProspectorPete, pagan prospector

#3

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 1,872
Phase Technical
13 February 2019 09:22 pm

On wet sand, the Impact works well, but be careful with sand ingress as with any non-waterproof machine. If you do decide to use the Impact on the sand, make sure you clean out the shafts after use.

The COG (Beach) mode makes it run quite stable for a single frequency unit, and you can often push the sensitivity quite high. But with the GB number on zero, you will have wiped out gold chains - (let me add though that most detectors struggle to find thin chains, including PI machines). One thing I have mentioned in the past is if you want to find chains, and other small jewellery, then after you ground balance, off-set the ground balance number manually by a few numbers. The unit will still remain stable, but you will be able to find chains again (just don't expect huge depth). Now, depending on the beach, you may have to drop your sensitivity a little, so it's a bit of a balancing act. Generally I like to find bigger stuff that is worthwhile digging, so keeping the GB on or just off Zero with higher sensitivity will achieve more depth on most coins and larger rings etc. BUT, if you have found a productive little pocket, then you can off-set the Ground Balance and re-scan it just to see what's there.

This is all demonstrated in the following video:

Last edited by PhaseTech (13 February 2019 09:23 pm)


Agent for Minelab, Nugget Finder, Nokta & Makro, Quest, Detech, SteelPhase - Phase Technical Website

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#4

oldtimerROB
Member
Joined: 01 December 2016
Posts: 279
Member
08 August 2019 05:29 pm

In the GT the Impact has real grunt in the deep mode.eg 20 inches deep compared to 8 inches deep with the all metal mode on a 1.5 inches diameter ball of silver foil.The Impact is so sensitive it picks up too many false signals for me to dig.Someone has to advise on the optimal settings on goldfields to counter this,but then you might miss a nugget but digging up all the signals is unpractical. I use DI2 on the hills as it goes 50% deeper than all metal as deep mode will not ground balance there due to very high mineralisation.I will have to test how deep COG mode goes on the hills but I suspect not very deep.The 15 inch coil,the IM 40 is too heavy for prospecting but I would like to fit a 13 inch coil.Black Dog makes a good one for the Impact but not available here.Nokta should have marketed one on the internet as there is some interest from consumers.


A happy marriage means not having to spend all your days at the pub and so go detecting more often.

#5

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 1,872
Phase Technical
10 August 2019 11:26 am

Sorry but Deep mode is just not able to get 2.5 times the depth of All-Metal mode, especially in mineralised soils. Deep mode is a higher gain mode, designed for use in low-mineralised soils, and for use with a slower sweep speed. DI2 can go a little deeper than all-metal/GEN but again not 50%. I think you need to spend a bit more time learning the unit. You say you are getting lots of false signals, that is probably due to using Deep. Use VLX modes or Gen in mineralised soils. In Gen mode you have the advantage of adjusting the iSat to maintain a smooth threshold - this is how you maximise sensitivity on the Impact.

If you want to find gold with the Impact, I would be focusing on trashy areas (where it is hard work with a PI unit), and use a small coil, as the Impact separates targets from ferrous extremely well. In this case I would be using Gen Delta mode, or if the trash is really thick, DI3, or if trashy and mineralised VLX2.

Just be aware that the ferrous range of the ID's changes with different modes, in Gen and VLX it is 0-40, and in DI3 it is 0-15. Nuggets coated with iron can ID very low, and even in the iron range, so be careful.


Agent for Minelab, Nugget Finder, Nokta & Makro, Quest, Detech, SteelPhase - Phase Technical Website

2 users like this post: Ridge Runner, Jarrod84

#6

PhaseTech
Phase Technical
From: Adelaide, SA
Joined: 29 May 2014
Posts: 1,872
Phase Technical
13 August 2019 01:07 am

I've got a Nokta Impact playlist on my YouTube channel. Lot's of cool videos.

https://www.youtube.com/playlist?list=P … IkbogKSMjB


Agent for Minelab, Nugget Finder, Nokta & Makro, Quest, Detech, SteelPhase - Phase Technical Website

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#7

oldtimerROB
Member
Joined: 01 December 2016
Posts: 279
Member
23 August 2019 04:50 pm

Thanks for your recommendations on the Impact.I can,t run the tests again as I have been living in Eastern Europe for a while but plan to return to Victoria and live on the diggings next autumn.I have every confidence and stand by my figures.I have had extensive use of the Impact contrary to what you think.We seem to have different Impacts?possibly running different software versions?Another testI did at South Wedderburn was on a gold specimen containing 1-2 grams of gold.Again I seem to remember All Metal got approx. 3 inches depth but DI2 got 5 inches in about 90% on the min. meter.Deep is not a low mineralisation mode as it can balance at up to 80% min. but can be used in most areas on the diggings of the GT except the hills thereafter I prefer to use DI2 or 3.All Metal is good for finding hot rocks as it has disc. which can be set at 01 or 02, and can find very small targets of 0.1 gram at 3 inches in low min.It is very susceptible to mineralisation and going from low to high min. it,s depth will be drastically reduced,possibly to half.I have not used audio enhancement to get extra depth as the manual does not recommend it for general search.DI2 got two sharp signals on a hill at Goldsborough which was still there at 12 inches depth but at 18 inches depth of the dug out hole had disappeared. It must have been something like a mineralised nodule.
All the GT diggings I have been to are relative clean of junk except for tin foil.That's when DI modes come in handy as you can filter out the tin foil to either mask it on a ID setting of 17-19 or have it come up as a ferrous signal.One possible explanation why All Metal gets only low depth is the iSAT is set at 06 whilst DI and DEEP is set at only 01?
I still plan to buy a 13 inch coil for the Impact.A Karma coil is available for purchase online worldwide from the Netherlands for 129 Euros.


A happy marriage means not having to spend all your days at the pub and so go detecting more often.

#8

Ridge Runner
Member
Joined: 04 September 2014
Posts: 5,231
Member
23 August 2019 05:05 pm

I Think PhaseTech is talking about actual In Ground tests Not Air Tests, Not only is he a Nokta Dealer but he must be One of or The Most Skilled Detector Field testers on the Planet Bar none so rest assured that he is reporting the facts.


Dig em all,

3 users like this post: AngerManagement, Jarrod84, Ded Driver

#9

Jarrod84
Member
Joined: 08 October 2017
Posts: 104
Member
23 August 2019 11:01 pm

OTR, can I ask why have you persisted so long with the impact and not bought a dedicated pulse induction gold detector when you main target is gold?

1 user likes this post: Ridge Runner

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