Kevin Hoagland explains "The Halo Effect."

[Terry Soloman]

 

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[Fletch88]

I guess this applies for good and bad targets as well?

 

[cudamark]

To expand on that a bit......sometimes when you dig and break up part or most of the halo, you won't get a signal because the target (which is now smaller) is slightly out of detection range. If you dig down another couple of inches, many times you will come up with the target. This is also when a good pin pointer is invaluable. He did mention mineralization, which can sometimes be a concentrated clump that once broken up, won't give a signal anymore either. Same goes for a totally corroded target, such as the nail he used as an example. If it totally crumbles into tiny pieces, the detector won't recognize it as a target anymore.

 

[flgliderpilot]

To expand on that a bit......sometimes when you dig and break up part or most of the halo, you won't get a signal because the target (which is now smaller) is slightly out of detection range.

I had this problem today when I found a good coin hit but kinda deep, dug down a bit and then it completely disappeared. Now I understand what may have happened. Thanks!

 

[IBdiggin]

Some refer to these as ghost signals. Most times these will be one way hits and unstable. If you run low discrimination 9 time out of 10 you will hear iron grunts or low tones mixed in with the false high tone.
Big rusty iron can give off false high tones up to a foot or more away from the actual target if it is big enough, rusty enough and sensitivity is set high. -----------------------IB

 

[airscapes]

This is why it pays to listen to Iron and not discriminate it out. Many time, I hear the iron tone one way and the high tone the other. Yes it could be 2 targets next to each other.. but it helps you decide when you see the minus number in both directions and the iron tone solidly in one. Stomping on the ground over a one way good signal can sometimes break the halo and you will then only hear the iron tone..
This article explains the effect as well Halo Effect

 

[I can dig it]

So I guess non corroding metals like silver and gold aren't subject to the halo effect?

 

[Fletch88]

Kevin Hoagland explains "The Halo Effect."

I believe they are even though many argue that there is no such thing. I have mostly experienced this on deep targets in salt water beach when the soil/sand matrix is broken up and target seems to disappear. 2-3 scoops on down deeper and it usually comes out in scoop

 

[cudamark]

So I guess non corroding metals like silver and gold aren't subject to the halo effect?

Silver will tarnish and produce a halo.....gold not so much....but depends on the purity and what it's alloyed with.

 

[Tnmountains]

And sometimes you just find that little orange rusty spot in the soil and nothing else