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Re: Sovereign and Excalibur Search Coils
Posted by: Critterhunter
Date: June 23, 2012 09:40AM
I haven't used any of the 8" coils except the 8" BBS coil on a friend's Excal here and there and it's a heavy coil as I've held it in my hand detached from the shaft to paint the bottom with spray on bed liner for protection.

I guess the 8" Coinsearch coil, which is still a favorite among many, is a true 8" coil and I've read of some really good deep coins with it at around 12" or so.

The 8" BBS and Tornado coils are actually 7 & 1/4" in diameter. I know I couldn't believe how small the BBS 8" coil was, so I can see why some say the 8" Tornado is their favorite for excellent separation while still getting outstanding depth because they are small coils at 7 & 1/4th". I've read of guys pulling coins around 12" deep or so with this coil. That's probably why many prefer it to even the 5.5" S-5 coil or 5 or 6" Excelerator coil because they still get excellent separation while getting outstanding depth.

I have the S-5 and haven't used it much yet but the separation is as good as it gets of course, and I've thus far dug a rosie at about 7" deep between two shallow pull tabs. The rosie hit so hard and ID'ed so easily that I think it probably could have easily been 9" deep (or maybe even more) and I would still have got a good signal on it. That's amazing in my soil, because of all other non-Minelab machines I've used in my soil only the best few of them could struggle to get about a max of 7.5" deep on a silver dime even using a 9 to 10" coil, yet the little S-5 is easily matching that! I of course give a large part of the credit to it being used on a Sovereign, but I also give credit to this excellent little coil and Sunray. Also, I've used small concentric coils on other machines and they don't seem to hold their depth as well when they get smaller than about 7" compared to a little DD coil. Many Minelab guys with FBS machines swear by this coil above all others in the worst of the worst in terms of super heavy trash.

The 10" Tornado is for sure the best stock DD coil I've used on any machine thus far. It has very good depth as I've dug a few coins at about 11" deep in wet conditions with it that banged hard and ID'ed well. This coil also is very stable and has really good left/right separation for a 10" coil. IMHO it's a much better coil than the 10" DD coils I've used on other machines. It is NOT just a Sov/Excal version but is a much better coil to me. Also easier to pinpoint with. Up until the SEF coils, the 10" Tornado was the best coil I've used on any machine over the years, concentric or DD. Also, up until the SEF coils the Tornado was the best coil I've used in terms of finding coins on edge, and in terms of depth and separation...It was better than any larger coil I've used, DD or concentric.

The 12x10 is by far the best DD coil I've ever used, even a bit better than the 10" Tornado in both depth and separation. It's even more stable than the excellent Tornado, runs smoother in bad ground or over iron, and allows higher sensitivity settings and often full blast sensitivity at many of my sites. It's separation is wicked and laser like and makes the GT feel like the processor has been sped up due to the faster reaction between targets. It also oddly seems to make the pitch of targets a bit higher and crisper. While I haven't dug coins 11" deep with it yet, when I did that with the Tornado the conditions were ideal with perfect moisture to the soil and the right site where coins could be that deep. However, I'm popping wheats and silvers with the 12x10 at 8 or 9" deep in dry conditions more often than I did with the Tornado. That might not sound too impressive but my soil tends to be mineralized at many of my sites and so only my Minelabs like the Explorer or GT have been able to break the 7.5" barrier and even muster 8 or 9" in my soil even when it's dry. I feel the 12x10 makes this feat of 8 or 9" in dry conditions on a more regular basis even easier than the stock coil. I also feel the 12x10 is deeper than the 10" coil because I tested them both on a silver dime at depth. At 3PM the stock coil could not even hear the coin but the 12x10 did and I did not touch the sensitivity at all. The increased coverage of the 12x10 is also nice, and I'm shocked at the separation of a coil of this size. The 12x10 without the coil cover and using spray on bed liner is lighter than the S-12, which is a legendary coil and praised for how light it is.

I owned a 15x12 for a while and the coverage is awesome for things like beach hunting. It did get better depth than the 10" Tornado in sand but for some reason did not get better depth than stock on land. I think it's just too big and taking in too much ground signal in my soil and degrading target ID at depth. I also believe this because I found it gave best ID at depth with the sensitivity much lower than what was max stable, at say around 3PM or usually with the dial pointing at the "C" in noise cancel on the GT's face plate. This coil could often run at almost or even full blast sensitivity but despite that it gave best ID much lower. I think the size of this coil in my soil and by running it too hot would just take in too much ground signal. Others report it gets better depth for them then stock in their soil, though, but it only did for me on the beach. Weired thing is my beaches are mineralized like some of my land sites are, so I don't know why it got better depth in the sand then stock but not on land. Very stable coil like the 12x10, and it's even lighter than the stock 10" Tornado if you take off the coil cover and use spray on bed liner.

Both the 12x10 and 15x12 seem to hit coins on edge harder than any coil I've ever owned, although the stock 10" coil was very good at that. They also both seem to have very good sensitivity to small items. I'm not sure but I think they are more sensitive to little things like earring backings than the stock 10" coil, but the stock coil was still pretty impressive at that to me for being a bigger coil and also because the Minelabs don't have a good reputation for hitting hard on small stuff. I'm amazed at some of the small things I've dug at depth with the stock coil, but I'm more impressed with the SEFs in this respect.

Somebody needs to chime in with the other 8" coil from Sunray and I think Detect made a concentric 8" coil for the Sovereign at one time. In fact, last time I looked on Kellyco they had what looks like a new 8" DD Excelerator coil for the Sovereign because I've never heard of an 8" one by them for it.

Also we need the WOT guys to chime in as many use them, as well as any of the Penetrater/Excelerator 12, 14, 16, and 18" round coils. They don't seem to be very popular but I know there are a few guys on here who use those coils. And don't forget besides the rare and solid 11" version of the Minelab coinsearch coil there was a solid 11 or 12" Sunray coil too I think that was replaced by the S-12. The S-12 is a very popular coil so somebody needs to cover that one well too. Then there is what I think are two (?) odd shaped coils by Coiltech, the platipus and something else. And, there's also a the 4.5x7 Detech coil that I don't think was ever sold in the US but it might still be in the UK.



mining members for own forum



Edited 3 time(s). Last edit at 08/11/2012 03:12PM by Ron from Michigan.


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