Find's Treasure Forums

Welcome to Find's Treasure Forums, Guests!

You are viewing this forums as a guest which limits you to read only status.

Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.

Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.

Click here to register!



Need Support Help?

Cannot log in?, click here to have new password emailed to you

Changed email? Forgot to update your account with new email address? Need assistance with something else?, click here to go to Find's Support Form and fill out the form.

11” coil bs 6” coil

DigDog

Well-known member
I know there will be differences with depth and separation between the two coils, has anyone used both and noticed anything and will the smaller coil find smaller targets better or is it just a difference of depth and separation?
 
Mainly what I have experienced is separation improvement and less ground coverage using the 6" coil over the 11". The 6" goes extremely deep for its size. In clean ground I use the 11" in iron infested sites I use the 6". Another benefit of the 6" over the 11 " is the weight.
 
Mainly what I have experienced is separation improvement and less ground coverage using the 6" coil over the 11". The 6" goes extremely deep for its size. In clean ground I use the 11" in iron infested sites I use the 6". Another benefit of the 6" over the 11 " is the weight.
So you experienced the 6” close in depth as the 11” ?
I wonder though if it will pick up smaller targets better or if size of coil has no bearing on target size even in clean areas
 
Well I'm going to put it this way I don't feel like I am missing anything that the 11" would have gotten. But in my Georgia red clay the sinkage rate isn't to bad. They both pick up small targets quiet well.
 
Well I'm going to put it this way I don't feel like I am missing anything that the 11" would have gotten. But in my Georgia red clay the sinkage rate isn't to bad. They both pick up small targets quiet well.
Thats the biggest draw back in Fl I think is that we are basically on one big sandbar.
The soil is very sandy and I think the sink rate is pretty fast
Had couple coins in yard as a test garden they are gone far as i can tell
 
my take on it and proof. i have roman coins buried at different depths .in very iron infested ground. The lg15 hits the targets the 11 inch doesn't. I think of is as if you have a bed of nails, and walk over them (11 inch coil) you will stand on many. If you tip toe over this same ground (6 inch coil) you wont stand on as many., Smaller coil better recovery and can get closer and between the ground iron arrangement. Video below shows lg15 in action.

 
Weight is an important factor to me, I can’t picture that much difference in weight between two but im sure you are right especially swinging it for hours.
Im sure it balances alot different as well.
I believe its with the concentric coils the size determines the depth overall.
For example a 12” coil goes twice as deep as a 6”
 
Tha
my take on it and proof. i have roman coins buried at different depths .in very iron infested ground. The lg15 hits the targets the 11 inch doesn't. I think of is as if you have a bed of nails, and walk over them (11 inch coil) you will stand on many. If you tip toe over this same ground (6 inch coil) you wont stand on as many., Smaller coil better recovery and can get closer and between the ground iron arrangement. Video below shows lg15 in action.

That’s prety impressive 9” deep roman in iron with a 6” coil
 
Couple of things: Separation is very much noticed and the #1 thing I note is the weight difference. I can swing the 6" a lot longer than the 11".
I like running the external battery on it. Have you tried the battery with the 6” coil?
The lighter coil probably offsets the battery and balances it nice.
 
I don’t know how a concentric coil would work out If thats what you mean by 9” or 8”. Round.
I think that 6x9 DD would be great combination for both separation and coverage
 
Awhile back I dug a basic quarter number (52) with the 11”. Depth showed deep and recovery was measured at 9” and it was a 1903 IH. Manual advised numbers may be skewed when depth on smaller coin detected and its true. As far as the 6” I’ve minimal experience but it sure cruises thru the taller grass and yes, much lighter.
 
Depth wise, both reach about the same in real world hunts… The main differences are coverage per sweep and the amount of targets (or ground minerals) that each see simultaneously as a result. 11 and 13" coils are also more susceptible to EMI.

Now, an important caveat… When I say that depth wise 6 and 11 are about the same, it only applies to the very extreme edges of their fields (or sensitivity patterns). Why is it important? Because they're shaped differently. An 11" coil's sensitivity pattern, when visualized from the side, is only slightly rounded, almost rectangular. As a result, at the extremes of your reach, you're working with a wide brush, so to speak. Much better chance to hit a target. With the 6" coil, on the other hand, a side view of its sensitivity pattern would be much more parabolic. So for example, let's assume that both can reach a silver dime 12" deep in clean ground (YMMV depending on soil and EMI). At this depth, an 11" coil will be sweeping about 6" wide path (again, depends on diffusion in the soil), while the "sniper" will only be touching a 1-2" wide strip.

In short: 11" covers more ground per sweep, up to its maximum depth, but it's more prone to EMI and "averaging" with hot rocks and junk. Both can see ridiculously small bits of metal, 6" having a slight edge here. If you're dealing with junk or high EMI situation, 6" will be your best bet.
 
Depth wise, both reach about the same in real world hunts… The main differences are coverage per sweep and the amount of targets (or ground minerals) that each see simultaneously as a result. 11 and 13" coils are also more susceptible to EMI.

Now, an important caveat… When I say that depth wise 6 and 11 are about the same, it only applies to the very extreme edges of their fields (or sensitivity patterns). Why is it important? Because they're shaped differently. An 11" coil's sensitivity pattern, when visualized from the side, is only slightly rounded, almost rectangular. As a result, at the extremes of your reach, you're working with a wide brush, so to speak. Much better chance to hit a target. With the 6" coil, on the other hand, a side view of its sensitivity pattern would be much more parabolic. So for example, let's assume that both can reach a silver dime 12" deep in clean ground (YMMV depending on soil and EMI). At this depth, an 11" coil will be sweeping about 6" wide path (again, depends on diffusion in the soil), while the "sniper" will only be touching a 1-2" wide strip.

In short: 11" covers more ground per sweep, up to its maximum depth, but it's more prone to EMI and "averaging" with hot rocks and junk. Both can see ridiculously small bits of metal, 6" having a slight edge here. If you're dealing with junk or high EMI situation, 6" will be your best bet.
So basically you have to sweep the 6” coil im 1-2” increments vs 6” increments with the 11” coil?
I would think you can sweep the 11” coil in 11” increments and 6” in 6” to cover all the ground with a DD coil
 
Top