GroundScanner
Active member
I bought a nel 5" coil for my bandito2 umax used it ones. I was wondering if the Tesoro 5.75" conc. is any better for iron infested sites. Thanks , GS
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5 inch coil for umax.
- Thread starter GroundScanner
- Start date
kaolinwasher
Well-known member
I just got the sharp shooter for the silver and its not deeper in fact has less depth but does 100% better than the concentric with really badd ground like a basalt stone or a hot rock but it is heavy I may just use the concentric as long as the ground is medium to light you can't beat the concentric
one of the detector manufacturer's own search coil offerings. Most of them make a workable search coil for those conditions, but more than the search coil it is the abilities of the detector that provides the performance we need. I have worked with both a manufacturer's Concentric and Double-D coils as well as different aftermarket Concentrics and DD's. Most of the aftermarket coils tend to be Double-D and I believe it is mainly more of a popular trend [size=small](aka 'fad')[/size] than anything else.
It certainly isn't from being able to put-perform a comparable size Concentric coil especially in the smaller-than-stock coil sizes, and more importantly for hunting in a dense iron nail littered site. I hunted some places with ferrous junk in older parts of towns, but since I first started hunting ghost towns and similar long-ago use places, I have made it a point to be sure I am ready to deal with a lot of iron trash, especially nails. Torn-down structures or those which have burned to the ground left some of the nastiest nail challenges I have seen.
I've worked ghost towns and similar places since the summer of 1969, and in 1994 I had my notebook in hand when doing some detector evaluation at a southern Utah ghost town. There, I chanced upon an Indian Head cent with four iron nails surrounding it. We used many detectors and coils present to check their performance at rejecting iron nails and responding to the coin. It was a great opportunity for me to make an impression of the nails and coin with my note paper, then gather them up and duplicate their exact positioning for future detector/coil evaluations.
I use that Nail Board Performance Test routinely as one of the first checks I do when evaluating a detector and coils. I have yet to find a Double-D coil that works as well as a smaller-size Concentric coil on any detector which does well in such a tough nail test.
The Tesoro 8" measures 8", the 7" Concentric I have on a Bandido II µMAX measures 7". My Outlaw sports what Tesoro calls a 5.75 or 5¾" coil, but my Made in the USA ruler measures it at almost exactly 6" in diameter. The 10X12 Double-D coil measures more than that at 10⅝"X12¼".
So, I have used my 6" Tesoro Concentric coil against a same-size Double-D coils on the same nail test challenge, and the Concentric provided the best all-around performance. I have the 6" Concentric mounted on my Outlaw as that is a detector/coil combo that I would usually grab to hunt in iron nail sites or other places with metal structures and fences, etc. I've been doing some testing recently using several Double-D coils.
A White's 4x6 DD coil and 6X10 DD, a Detech Excelerator 5" DD and 6" DD and 6X8 SEF DD, plus a Fisher F19 and Teknetics Omega using the 5" DD, 5X10 DD, and a NEL Sharp, Sharpshooter, and 7" Tesoro DD on some Tesoro models. I challenged all the DD coils and detectors they were mounted to against a White's IDX Pro w/4½" & 6½" Concentrics, MX5 and MXT All-Pro w/6½" Concentric, Bandido II µMAX w/6" and 7" Concentrics and Outlaw with 6" and 7" Concentrics.
Unfortunately, some manufacturers do not make a smaller-than-stock Concentric coil, such as Teknetics for the Omega or Fisher for the F5, or the new kid-on-the-block, the Nokta Fors Coin & Relic. All the latter has, at this time, are three Double-D coils. Personally I would like to see a smaller size Concentric from them, but handling a a close positioning of iron nails can still be a challenge for the more digitally designed detectors.
I do have some models in my personal arsenal that have Double-D coils, but most of my detectors use Concentric coils, and they are my preference when I get into a nasty iron nails challenged site. Matter of fact, in such tough encounters my personal first-grab detectors of choice would be the Tesoro Bandido II µMAX or Outlaw with either the 6" or 7" Concentric coil mounted. My next picks would be a White's Classic ID or IDX Pro w/4½" or 6½" Concentric coils mounted. Following that it would be an MXT All-Pro, M6 or MX5 w/6½" Concentric coil mounted.
The only detectors I own that can work quite well in such a nail infestation using a Double-D search coil are the two old Compass detectors listed below. They can be difficult to handle because they are traditional, non-discrimination TR's and that calls for skill to maintain a proper coil-to-ground relationship, but ... those old TR's essentially ignore iron nails and pick good targets out easily.
If you get your hands on a Tesoro 6" Concentric coil [size=small](that they call 5¾")[/size], do some testing using 3 or 4 iron nails and a single coin.
Lay the nails on the ground and sweep across them from various angles and use the lowest setting that just barely rejects the nails. On the Bandido II µMAX and Outlaw, for example, that is the minimum Disc setting.
Get the nails positioned as close to the coin as you can at different angles, so that the 6" Concentric coil still responds well. Sweep over the nails and coin from at least four opposing angles. Then swap to any Double-D coil you want without changing the set-up and sweep in all of the same directions. Odds are, the DD will not match the performance of the Concentric coil.
Just my observations,
Monte
It certainly isn't from being able to put-perform a comparable size Concentric coil especially in the smaller-than-stock coil sizes, and more importantly for hunting in a dense iron nail littered site. I hunted some places with ferrous junk in older parts of towns, but since I first started hunting ghost towns and similar long-ago use places, I have made it a point to be sure I am ready to deal with a lot of iron trash, especially nails. Torn-down structures or those which have burned to the ground left some of the nastiest nail challenges I have seen.
I've worked ghost towns and similar places since the summer of 1969, and in 1994 I had my notebook in hand when doing some detector evaluation at a southern Utah ghost town. There, I chanced upon an Indian Head cent with four iron nails surrounding it. We used many detectors and coils present to check their performance at rejecting iron nails and responding to the coin. It was a great opportunity for me to make an impression of the nails and coin with my note paper, then gather them up and duplicate their exact positioning for future detector/coil evaluations.
I use that Nail Board Performance Test routinely as one of the first checks I do when evaluating a detector and coils. I have yet to find a Double-D coil that works as well as a smaller-size Concentric coil on any detector which does well in such a tough nail test.
First to search coil sizes. I sure wish every manufacturer would identify their search coils with a closer-to-correct measurement. White's Blue Max 350 measures about 4½" across. Their Blue Max 600, 5.3 Black Max, 5.3 Bullseye and 5.3 Eclipse all share the same housing and it measures 6½" across the center.GroundScanner said:
The Tesoro 8" measures 8", the 7" Concentric I have on a Bandido II µMAX measures 7". My Outlaw sports what Tesoro calls a 5.75 or 5¾" coil, but my Made in the USA ruler measures it at almost exactly 6" in diameter. The 10X12 Double-D coil measures more than that at 10⅝"X12¼".
So, I have used my 6" Tesoro Concentric coil against a same-size Double-D coils on the same nail test challenge, and the Concentric provided the best all-around performance. I have the 6" Concentric mounted on my Outlaw as that is a detector/coil combo that I would usually grab to hunt in iron nail sites or other places with metal structures and fences, etc. I've been doing some testing recently using several Double-D coils.
A White's 4x6 DD coil and 6X10 DD, a Detech Excelerator 5" DD and 6" DD and 6X8 SEF DD, plus a Fisher F19 and Teknetics Omega using the 5" DD, 5X10 DD, and a NEL Sharp, Sharpshooter, and 7" Tesoro DD on some Tesoro models. I challenged all the DD coils and detectors they were mounted to against a White's IDX Pro w/4½" & 6½" Concentrics, MX5 and MXT All-Pro w/6½" Concentric, Bandido II µMAX w/6" and 7" Concentrics and Outlaw with 6" and 7" Concentrics.
Unfortunately, some manufacturers do not make a smaller-than-stock Concentric coil, such as Teknetics for the Omega or Fisher for the F5, or the new kid-on-the-block, the Nokta Fors Coin & Relic. All the latter has, at this time, are three Double-D coils. Personally I would like to see a smaller size Concentric from them, but handling a a close positioning of iron nails can still be a challenge for the more digitally designed detectors.
I do have some models in my personal arsenal that have Double-D coils, but most of my detectors use Concentric coils, and they are my preference when I get into a nasty iron nails challenged site. Matter of fact, in such tough encounters my personal first-grab detectors of choice would be the Tesoro Bandido II µMAX or Outlaw with either the 6" or 7" Concentric coil mounted. My next picks would be a White's Classic ID or IDX Pro w/4½" or 6½" Concentric coils mounted. Following that it would be an MXT All-Pro, M6 or MX5 w/6½" Concentric coil mounted.
The only detectors I own that can work quite well in such a nail infestation using a Double-D search coil are the two old Compass detectors listed below. They can be difficult to handle because they are traditional, non-discrimination TR's and that calls for skill to maintain a proper coil-to-ground relationship, but ... those old TR's essentially ignore iron nails and pick good targets out easily.
If you get your hands on a Tesoro 6" Concentric coil [size=small](that they call 5¾")[/size], do some testing using 3 or 4 iron nails and a single coin.
Lay the nails on the ground and sweep across them from various angles and use the lowest setting that just barely rejects the nails. On the Bandido II µMAX and Outlaw, for example, that is the minimum Disc setting.
Get the nails positioned as close to the coin as you can at different angles, so that the 6" Concentric coil still responds well. Sweep over the nails and coin from at least four opposing angles. Then swap to any Double-D coil you want without changing the set-up and sweep in all of the same directions. Odds are, the DD will not match the performance of the Concentric coil.
Just my observations,
Monte