Mono Coil Versus DD Depth Difference

[Chrisco]

On 23/01/2018 at 2:31 PM, Reg Wilson said:

All I can add is that I believe that coil technology still has a way to go, and stand by for some new developments on the horizon.

Does this mean you currently have another "unfair advantage" Reg??

[Chrisco]

On 23/01/2018 at 5:54 AM, Jonathan Porter said:

 

On 23/01/2018 at 5:54 AM, Jonathan Porter said:

 

The key to getting max depth is to pass the receive winding exactly over the center of a deep target so the coils receive points are evenly exposed to the targets field, in the case of a mono loop the whole coil is the receive with the apparent response seeming to come from the center of the coil whereas a DD manifests its response along the line of the cross over points of the windings, but once again the very center is the max signal spot for a deep target. The key is to move the coils receiver evenly and smoothly through the field of a target trying to create a good lead in signal response but more importantly transition smoothly out of the tail of the target signal so the response is recognizable from ground noise etc, generally a deep target well be quite broad relative to coil sweep.

Hope this helps

JP

 

So to ensure we are getting 100% forwards ground coverage with a ROUND  DD, would it be fair to say you would need to move forward by a third of a coil diameter (sweeping over a target 3 times in the forward movement) or could you move forward by half or even three quarters of the diameter?

[Reg Wilson]

Chrisco, all I can say at this stage is that there are people working on an 'unfair advantage'. I have my fingers crossed. Hopefully I may be 'first cab off the rank'.

[Chrisco]

Reg,,

Twice in a lifetime.....exciting times ahead for you.......again.

Chris

[Steve Herschbach]

21 hours ago, schoolofhardNox said:

I have a 12x15 mono coil, but always thought it would not work well in that environment? Thoughts??

You never know unless you try. You have the coil so the only investment will be time.

[Steve Herschbach]

8 hours ago, Chrisco said:

So to ensure we are getting 100% forwards ground coverage with a ROUND  DD, would it be fair to say you would need to move forward by a third of a coil diameter (sweeping over a target 3 times in the forward movement) or could you move forward by half or even three quarters of the diameter?

Overlap depends on time and place. If I am on a patch looking for the last missed nugget at depth I may advance the coil an inch at a time and hit it from four directions. If I have 100 miles of open terrain to cover I may not overlap at all. A fifty percent overlap works for me a lot of the time.

[Jonathan Porter]

11 hours ago, Chrisco said:

So to ensure we are getting 100% forwards ground coverage with a ROUND  DD, would it be fair to say you would need to move forward by a third of a coil diameter (sweeping over a target 3 times in the forward movement) or could you move forward by half or even three quarters of the diameter?

When I'm detecting I do exactly as Steve has just mentioned, so the overlapping is dependent on the "Chances" of a piece of gold, but I always have an ear out for a whisper target that might require further coil manipulation to manifest properly. I think this "ear out" approach is crucial to my success.

I have a highly developed sensitivity to slight threshold variations that might indicate a potential deep target which I then zone in on with coil manipulation (speed, height, coil center location etc), I "Feel" around with the coils receive pattern to try to get the potential response exactly in the sweat spot of the coil. Also with this approach you have to be VERY careful with the auto GB to make sure it is averaged correctly for the given location, continually swinging in over a deep edge of detection target is not a good idea!. Getting all these things aligned properly only takes seconds but will produce results to a savvy operator. Basically its an information gathering exercise which I then make a decision on probability wise. 

JP

[Chrisco]

Thanks fellas.

[Jin]

39 minutes ago, phrunt said:

How is this unfair advantage coil coming along Reg? To me it seems the Russians beat them to it with their X-coils

 

Id say the unfair advantage would be a 40t excavator. But it could be a ground loop system or one of those Bulgarian concentric coils. Whatever it is ill probably be late to the party. Just bought the zed after 4 years of it being released. And I may be late to the party again if one can believe what's posted on another forum.  Id say it was just a joke, but then again it could be someone that has insider information who has chosen to spill the beans as an anonymous poster.

Part of what was said. "the new Minelab Vanquish will be Minelab's best ever prospecting detector. It will have depth capabilities up to 50% better than the GPZ 7000. And a retail price of $12,995 here in Oz. It will render all current gold detectors obsolete"

Im sure JP said about 6 months ago there was no replacement for the zed coming up anytime soon.