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Why you think that the maximum depth of the DETECH coil 18x15' - 43cm? 
Maybe you didn't understand me right - I mean that we have test Golden King with Minelab Explorer SE with coil 18x15' and the result is - Minelab with that coil has beat the Golden King by maximum penetrating depth, speed of scanning and discrim. information.
Regarding cavity detection - maybe you have no enough experience with Nokta - this device show the cavity signal from some metal objects too! Also it can detect the cavity on depth no more then 40cm. It is impossible to detect on depth 1m horizontal tunnels that was build without disturbing of the soil surface. Try on real objects if you did not believe.

But I can understand your opinion if you one of the Nokta dealer. 



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http://www.thunting.com/smf/index.php/topic,4854.msg37966.html#msg37966

  Hobbyst, you still didn't understand me right. I'm not trying to promote DETECH (but if you insist I can surely say that Minelab or Whites with Detech coils or Lorenz more better then Golden King). Look at the bad sides that I have mentioned above:

- very unstable interface (soft ver. 10D);
- many false signals, because of unstable static mode of detection - such technology use some Chinese detectors from 90-s;
- the depth identity does not work, because with such technology  it is impossible receive right value of the depth. System of Golden King just associate the base with depth values with two parameters of the signal - the strength and size of the signal. It is fake depth identity, we have receive the values more then 70 cm for the objects with real depth - 15 cm;
- maximum depth - 3,5m for sands for very big object. This depth and even more possible to get also with GPX4500 or Explorer SE with coil 18x15" or 21x17". We have asked Nokta many times to make test for maximum depth (8m or even 6m) - they does not agree to make such tests because they know that for the ground - it is only 3-3,5m for very big objects;
- batteries brake very often;
- discriminator work good only on the air;
- it is impossible to separate two closely signals with this detectors (but it is possible with all others) minimum dimension between two objects must be more then 40cm!!! - if it so, detector can separate type of the metal and draw two 3D signals, but if dimension between coin and the iron - 30cm!! it shows you one 3D signal and give wrong information regarding type of the metal;
- 3D is just marketing movement - this visualization does not has any information instead of amplitude of the signal and suspicious information regarding dimension of the signal. Such system does not have linkage with space, it even does not has any accelerometer - only quartz that measure time of pushing the "confirm" button, so you need to know the right speed of scanning and always scan with this speed. If you want to receive long 3D signal from pipe - you can scan just a coin and at the third scan stay under the object 6-7 seconds,  it is simple algorithm;
- very big and unwell-founded price for such simple detector with OMAPx controller;
- uncomfortable work with this detector if you work alone because of such construction;
- automatic ground balance is very timeless

Minelab, Whites and other famous brands - has solve that problems many years ago.

I just try to leave objective review for the Golden King - because we have test it a long time.

You have wrote:
"... The first cavity I ever detected with the Nokta was stated as 60cm. A hole was dug and old tree roots were found at roughly 55cm. I have since found cavities at depths of over a meter, with the variance from predicted depth of 10-15cm."

It is not cavity - it's just changing of mineralization of the soil surface. This changing detectable on the depth 10-40 cm maximum.

Regarding Kellycodetectors.com - they are not authorities for us because they sell long range electroscopes and OKM detectors. They just sellers that does not respect buyers, because they sell such products. Another variant is that the Kellyco just start to work with Nokta and does not know yet the dark side of the reality .



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"We" - are the group of searchers from Russia.
We have this device from March till July, and have pass many tests on five different test ranges and on the fields.

All test ranges has different objects on different depth, I couldn't remember all information.
But I remember this moment:

On the loam there was an object 15x6cm from the steel that was on the depth 1,2m -
1. Golden King does not find this object but it gave us many false signals from such soil because of static mode of searching. We have lose more then 5 minutes by trying to find object in knowing place.
2. Minelab Explorer with DETECH coil find this objects easily without any false signals. We have pass this test in 50 seconds.

I have write you before - golden king can not find cavity, just changing of mineralization - it also can do older model TM808.
There is NO new technology of metal detecting inside Golden King, ask Nokta regarding any patents - they did not have any patents because they use same technology like older TM-808 (same frequency 12,5 kHz, same induction balance system but with DD coils with linux unstable software that takes a time for simple metal type recognition test).


Do you know what Whites do with older TM-808? They change the schematic and remove possibility of detecting the cavity. Ask them why. I can help you - because of the customers bad feedbacks regarding often false signals.


So this Golden King is just an induction balance metal detector without dynamic search mode (that has all professional devices) and with very simple discrimination possibility (such discrimination has cheap Chinese detectors).

I can say which device Nokta release next - metal detector WITHOUT cavity detection possibility and maybe that work in dynamic mode and of course it will has color LCD and Linux software, because programming on linux more simple then make good interface from the beginning.
All famous manufactures instead Nokta makes soft for detectors by them self, the problem of Nokta software solution is:
1). Long time of loading the system,
2). Unstable work because of many unusual functions (that 3D visualisation is also unusual because it is not has any objective information regarding signal - just simple 3D visualization algorithm.

When Nokta will realize new device we can talk again. 

But now I hope that my reviews will help many people to keep the money from such overstated and uncomfortable metal detector Golden King.

If you want to find the cavity - use GPR or ground conductivity meter it will help you MUCH more.

Dear Hobbyst, before your reply to my post - you must understand that we have big experience in this hobby and we respect all of new devices even if they made in Turkey, but when we make the tests - all things came at there places, so the Golden King place is just on sellers counter, but not on the field (like OKM and others unusual devices)!

Posted on: July 06, 2009, 09:26:33 AM

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I can give you good advice - change Golden King to older TM-808 with cavity detection possibility and to Whites Spectra Vision (that works on three freqs) with DETECH coils.

TM-808 - 600$ (maximum)
Whites Spectra V3 or Minelab e-track - 2250$
18x15' DETECH or Excelerators coils - 220$ (will be very soon for Spectra V3)

Total: 3070$
But for this money you will recieve much more comfortable for usage and more informative searching system then Golden King.




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The test objects was coins. Of course the depth gain you will feel only for medium and big objects thats stay alone on depth.
Smaller coils check smaller ground volume and can effectively registry small objects in rubbish place.
It is the problem of the big coils - useful only for medium and big objects that lies in the ground with small mineralization. 

Also I mentioned which variant can be better then Nokta Golden King that has coil 45x35 cm. It is very weak rival for Minelabs or Whites and it can not be so costly.

Silver79, you are right that mentioned about depth gain for small objects. There is no gain with big coils for small objects.

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We have change the inner software version of Golden king several times (by sending FULL set to manufacture - very uncomfortable) - all of soft has many bugs even last (10D).

If you want to buy big coil - you must understand that this coil good only on air. When you try to search with this coil - you must know that the on mineralized soil this coil work only with manual ground balance (press "-" until the end - you will receive some sensitivity but not better then with middle coil)
 

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