D D (Wide Scan) Coils

[fowlercharles]

I don't recall any recent , or really in depth discussions on DD coils in MILD dirt lately. Most all we ever read is how good they are "supposed" to be in mineralized dirt,I have read some from one or two guys that were doing really good in their mild dirt with DDs', but would like to hear more on the subject, and about the differences in the footprint between the DD and the Concentric. Specificly the 5.75 coils for both the T,V,C, and the other and older Tesoros.Seems to me like from what I understand about the DD footprint, it should have some advantages in really iron trash/naily places. Wouldn't these type places be considered after long periods of time to have become mineralized to some extent with all the "iron" rust and scale content? Or is my understanding of "mineralization" out of focus? Thanks, Charlie

 

[fenian13]

I use the 5.75 widescan in the trash. I have yet to try the 5.75 concentric. I've gotten some good stuff from pounded sites that were close to trash.

If I sent the pic right you will see a honker 11.8 gram silver ring I got about 2 weeks ago that was touching a ring made out of a nail. My Tejon hit it clean.

The silver ring had rust stains on it from touching the nail. I also got my first walking liberty half from a hammered school that was under pull tabs.

The small coil is not only good in trash, but good at picking up each different coin when good signals overlap.

Here in upstate NY the soil I hunt is mild in most cases.

 

[tvr]

In theory you shouldn't need to overlap as much with the widescan to get coverage at reasonable depth.

I use a clean sweep (a widescan) on the Tejon for reasons of coverage per sweep and less total surface area to be affected by masking than the 12 x 10 when it does get a little trashy.

Have not used the 5.75 widescan but sometime would like to compare it to the 5.75 concentric I have.
tvr

 

[BarberBill]

With comparable sizes the DD coils may have just a bit less depth in mild soil compared to the concentric. Otherwise they're certainly usable in mild soil although they may show a definite improvement in heavier mineralization. And, as mentioned above, they have a bit of an edge in trashy areas due to the different detection pattern.
BB

 

[fowlercharles]

That different "detection pattern" was part of what I was hoping for some dicussion on. Also just what the effect is to the mild ground when so much iron rust , scale, and iron have mixed in over many years.We know of the masking effect of the iron itself, but that doesn't speak to how the iron breakdown must change the composition of the dirt itself.. Lol, maybe some Geologist could clarify it some. Thanks , Charlie

 

[tvr]

but that doesn't speak to how the iron breakdown must change the composition of the dirt itself

Would think it may affect where the ground balance gets set. Have had some good sounding beeps disappear once I dug and found a rust red streak that got broken up but had nothing left that was solid. If I got a few like that I could ground balance to the pile of dirt with the rust streak and then not get many more phantom hits that went away when dug. That also left me wondering if I was leaving good targets that I wasn't seeing by adjusting to not see the nuisance.
Cheers,
tvr

 

[BarberBill]

The detection pattern is somewhat long and narrow, often compared to a wiper blade which implies it being somewhat narrower than it actually is. I'm not sure how accurate that description is when the coil is actually round (compared to an elliptical shaped coil). According to everything I've seen in relation to mineralization they are less affected by it and therefore tend to get more depth and give less erratic performance than concentric coils in the same ground, but I don't think they are influenced one way or the other in milder ground.
BB.

 

[fowlercharles]

I think the ground balance procedure/stability is sorta what I have that is causing my thoughts to be toward thinking that since the widescan is better in mineralized ground and the concentric better at discriminating, the ground polluted with heaps of iron/scale/nail/rust scale at old house sites etc. will have become mineralized enough by the abundance of iron oxide, thus hampering the disc. ability of the concentric coil..Seems to me the widescan should have a real advantage over the concentric in such sites, but that is not what is being said by most folks... Maybe I am wrong, but, from what I am discovering is that it seems to be that not many folks are using the widescan in the really iron/nailtrash places, but,there are a few that are, and when they tell it, are having some really great results.Many of the sites I hunt, I have to GB(TJ) at a clean spot (if I can find one) and walk in to the hunt site,as there is to much iron/litter to GB, even with my 5.75.concentric. I would think that would be another advantage of the widescan 5.75 over the Concentric 5.75. in that the GB may be more accurate and stable when you incounter the iron oxidized dirt. Thanks, Charlie

 

[fowlercharles]

I have found no info at all on the Tesoro Tejon 5.75 detection pattern, and can't help but wonder just what it looks like. Seems that when they first came out and I got the Concentric, there was some info/drawongs but I can't find any of it now. I have had to lay up all summer due to bad health and the heat, and am hopeful that by time fall gets here I will be able to get out again and do some scratching. That being said I have naturally been looking forward to it and thinking on anything to be done to improve chances of digging some goodies . Been working a site continually settled since 1808 at the suspected site of the first house/cabin/cabin whatever which is pretty much as was except for an occasional tractor plowing near it.Lots of iron trash went down in those many years and I may as well add another coil to the gear box., so I am trying to learn what I can about the widescan. I believe the 5.75 will be the best choice. I really like the 5.75 Con. but have atcually made more finds with the 9-8 spoked.That thing goes almost deeper than I want to dig, at least until the dirt moisures up some.I have a notion the Widescan will pull some goodies yet from some well hammered/trashiest ground and hopefully I can tell y'all my thoughts on it were correct. Thanks to all, Charlie.

 

[joe dirt_1]

I tried an 8 1/2" widescan coil on my Silver

 

[fowlercharles]

Fenian, your honkin good finds,with the 5.75 Widescan, especially the ring next to the iron proves to me that the widescan may allow for a more accurate and stable GB to be maintained when the iron oxidized ground is incountered. My dirt is supposed to be mild too, but so far on the older site I have been working on I have found more with the 9x8 coil than the 5.75, and that is in one area where the iron litter is pretty bad. I was really surprized that I did not do better there with the 5.75.Con.. Best finds so far have been a really rare1803 Carolus IIII Spanish Colonial (I/2 Real), and 1839 1/2 dime and a slick button, from Andrew Jackson Battle of New Orleans time period..I just have a hunch it may be time to try a widescan coil in the really trashiest parts of the site,The coin/button finds so far in that area were probably no deeper than 5-6" inches,though I did find a little shoe buckle and button back at somewhere around 10" in a not so trashy area, with the 9x8. It will be fun to get back in the dirt, when it cools off some. and hammer at it again.,The heat now is really to much for me. . Thanks, Charlie

 

[fenian13]

Charlie, You have some nice finds. I use the stock concentric after I first hit an area with the 5.75 widescan.

I would like to try the clean sweep coil as well as a 5.75 concentric. But for now the stock concentric and a small DD seem to serve me fine.

Good luck. Patrick in NY

 

[BarberBill]

Several forum contributors that I consider really knowledgeable tend to favor the concentrics over all. That said, if you don't pass either type of coil over it, it's not going to be retrieved.
BB

 

[fenian13]

Being relativly new to detecting I am still experimenting some. One of the things I like about the small widescan is that I do not need a probe.

I think that the small concentric would be even better at pinpointing.

Bottom line may be just personal choice for your style of hunting and your predominate type of ground.

I may have more finds with the widescan solely because I use it more.

Good luck to all, Patrick