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A good reply, Brian, which brought a few things to mind.

October 03, 2020 10:04AM avatar
You are very correct in each of us in this great sport ought to use a detector and coil, learn it, then like it or leave it so that we end up liking and enjoying whatever it is that satisfies our wants and needs. In my case, I had experiences with the brand new 7" Detech DD I bought right at the White's factory. the aftermarket coil made for them by Detech, and I also got the first prototype 6½" Concentric that they brought to me out of production. I still had to have Monte Jr. seal the upper and lower halves together and make a decal for it.

I had very good performance with my new 6½" Concentric coil on that particular new MX-7 that was at the change from prototype to production. But the aftermarket 7" DD coil didn't work well for me. Not in my tests, or in some of the more challenging areas of the ghost towns we hunt. It kind of worked OK, but fell short of performance on the MX-7 compared with the also new 6½" Concentric, and it didn't perform that well when compared with other makes and models I had which also used DD coils.

So that left me wondering a few things, such as:

• Was the MX-7, and therefor the MX Sport, designed more for Concentric coil performance than DD?

• Did I have a glitchy MX-7?

• Was there a problem with that particular 7" DD coil?

• To go a step further, do those after-market coils have a lot of inconsistency from coil-to-coil?


I do know that in urban Coin Hunting settings, at the local park and such, the 6½" Concentric provided me better performance in the way of tighter Target ID when most targets, desirable or not, were located from surface to 4". Also, I used it here in town at three vacant lots where homes had been demolished and two of the lots were pretty much leveled and easily huntable, although they did have a scattering of left-over debris to deal with.

At the time I was comparing the White's MX-7 w/7" DD and 6½" Concentric coils and Nokta / Makro Multi-Kruzer w/5X9½ DD coil, mainly, but also using a Makro Racer 2 w/7" Concentric and White's XLT w/6½" Concentric. I worked three vacant lots, one with a demolition going on while I hunted, as well as a POW Camp and one ghost town. I had to look back to early 2018 in my binder to double check which coils were used when finding the most wheat-back cents, old nickels, and any silver coins. The Multi-Kruzer w/5X9½ DD started out that year OK, but the bulk of the better coins were with the XLT and 6½" and Racer 2 and 7" Concentric coils. The MX-7 was a mix of both the 6½" Concentric and 7" Double-D with the 6½" edging out the 7".

That's what I had remembered about the MX-7 that year, and I tried to figure out why. I did fine with the Racer 2 and 7" Concentric, nd it is an open-frame coil design. But with the MX-7, I opted for the 6½" Concentric coil because it was a solid-body and guess I figured it would be the better set-up to grab so I wouldn't have any hang-up issues from the short stiff weeds and brush in any of the different locations. I had purchased a 2nd MX-7 so I had each of the coils mounted on their own detector and all I had to do was grab the detector/coil combo I wanted.

In hind sight, I honestly like the looks of the Detech 7" DD and still do. I didn't have any hand-up with the solid 6½" DD coil, but thinking back and even to the present, I use a 5X9½ DD on my Simplex + and have on occasion with the CoRe and Relic and back then on the Multi-Kruzer, and the 7" Concentric on the Racer 2 and 5X8 DD on the Vanquish 540 ... and all of those are an open-frame search coil and I seldom get a coil hang-up. So it might have been just one of those logical thoughts back then to grab the solid coil rather than the open-frame coil, even though I might have had no, or very few, coil snags with the 7".

I've used CoPlaner or Concentric coils as long as we've had them and Double-D coils since late '71. Most of the time I have favored a Concentric coil that was 8" or smaller because they provided some of the best Discrimination in iron littered sites and also because they gave slightly better depth and quicker, accurate pinpointing compared with a Double-D coil. A lot really depends on the particular make and model detector and the circuitry design because some detectors simply work better with the one type of coil than they do the other.

It used to be that most of my detectors sported a good Concentric coil and a few in my outfit wore a DD coil. Today, things are different. I have a 6" Concentric on a Tesoro Silver Sabre µMAX and on each of my Bandido II µMAX units, a 6½" Concentric on my XLT, and a 7" Concentric on my Makro Racer 2. But there is an 'OOR' DD on my Nokta CoRe, 5" DD on the Nokta Relic, 5X9½ DD on one Simplex + and 11" DD mounted on the 2nd Simplex +, a 5X8 DD on the Minelab Vanquish 540, and currently each of my Garrett Apex units have the only coil available right now, a 6X11 DD. So the Double-D coils are outnumbering the Concentric coils, and I don't have a problem with that for one very good reason. Those coils ... mounted on those models ... combine to provide excellent performance where I hunt.

Now I am wondering if I might want to track down another Detech-made 7" DD for the MX-7 and check it out again to see if I had a poor-performing coil in the first place .... or do I just want to chalk it up to "Well, that's how things go." and leave it at that. Heck, it sure isn't the only detector I have to us and keep me happy. And I am glad to know you've gotten comfortable with the coil options you have for your handful of detectors, too.

Monte

"Your EYES ... the only 100% accurate form of Discrimination!"

Stinkwater Wells Trading Post
Metal Detector Evaluations and Product Reviews
I'm now located in Clyde, Texas
monte@ahrps.org ... or ... monte@stinkwaterwells.com
503-481-8147
Detector Outfit: A selection of my favorite makes and models, with the best coils mounted for the tasks I'll take on.
Apex .. FORS CoRe .. FORS Relic .. Impact .. Inca .. Bandido II µMAX .. Silver Sabre µMAX .. MX-5
Pinpointers: Pulse-Dive Pointer and AT Pro-Pointer .. Headphones: 'Hornet' & 'Wasp' .. MS-3 Z-Lynk
*** All working well today to make memories for tomorrow. ***
Subject Author Views Posted

Its not fair Attachments

OregonGregg 479 September 29, 2020 11:33AM

Taking Action -

UtahRich 284 October 01, 2020 02:31PM

Re: Taking Action -

OregonGregg 239 October 05, 2020 07:34AM

Looking for Magnum PI Ferrari 308 GTS in pristine condition - low miles

UtahRich 228 October 05, 2020 06:00PM

Re: Taking Action -

Druid 367 October 02, 2020 07:01PM

Re: Taking Action -

SvenS 214 October 04, 2020 07:13AM

From Canada, land of the Maple Leaf and . . . Books.

UtahRich 283 October 02, 2020 10:52PM

Re: Taking Action -

diggindeep 255 October 01, 2020 03:19PM

Field Trips -

UtahRich 218 October 01, 2020 05:35PM

Thanks everyone for the comments. Attachments

OregonGregg 301 September 30, 2020 11:54PM

Re: Thanks everyone for the comments.

Druid 210 October 02, 2020 07:04PM

Re: Thanks everyone for the comments.

WM6 224 October 03, 2020 03:14AM

Re: Its not fair

Dan'o 234 September 29, 2020 09:37PM

Re: Its not fair

desertsmith 233 September 29, 2020 06:12PM

Re: Its not fair thumbs up

EL NINO 219 September 29, 2020 05:52PM

Re: Its not fair

jmaryt 246 September 29, 2020 04:32PM

Well, I guess 2 good coils out-of 3 isn't too bad.

Monte 244 September 29, 2020 02:06PM

Re: Its not fair

Timbertodd 238 September 29, 2020 01:10PM

Re: Its not fair

D&P-OR 225 September 29, 2020 12:17PM

Now its on!

zincoln 268 September 29, 2020 12:11PM

Re: Now its on! Attachments

Kickindirt 280 October 01, 2020 04:31PM

Re: Now its on!

Druid 240 October 02, 2020 07:06PM

Re: Now its on!

OregonGregg 230 October 02, 2020 07:58AM

Re: Now its on!

Kickindirt 245 October 02, 2020 01:27PM

Joel, OregonGregg said I'd comment on the Detech 7" DD .... so I will. Attachments

Monte 241 October 01, 2020 08:23PM

Re: Joel, OregonGregg said I'd comment on the Detech 7" DD .... so I will.

Kickindirt 232 October 02, 2020 01:19PM

You didn't ask for second opinion, but here it is.

zincoln 227 October 02, 2020 02:22PM

A good reply, Brian, which brought a few things to mind.

Monte 215 October 03, 2020 10:04AM

Your coil was probably fine...

zincoln 226 October 03, 2020 10:54PM

Re: Your coil was probably fine... Attachments

EL NINO 215 October 05, 2020 09:16AM

Nope.sad smiley That particular 7" DD wasn't.thumbs down

Monte 204 October 04, 2020 11:42AM

Re: You didn't ask for second opinion, but here it is. Thanks

Kickindirt 212 October 02, 2020 06:38PM

Sometime get w/'Zincoln' and try both, or get with me and try the 6½" Concentric.

Monte 219 October 02, 2020 02:03PM

Have my eyes deceived me?

UtahRich 207 October 02, 2020 11:01PM

No, your eyes didn't deceive you. And i did say "and maybe..."

Monte 216 October 03, 2020 10:33AM

Re: Now its on!

OregonGregg 208 October 01, 2020 06:37PM

oh !! its on.

OregonGregg 224 September 29, 2020 04:46PM

Is this the line for tickets to the Matinee? I hear it's a Western Gunbattle.smiling bouncing smiley N/T

UtahRich 213 September 29, 2020 11:40PM

Get your tickets......... Attachments

OregonGregg 316 September 30, 2020 01:49PM

Re: Get your tickets.........

DW-BGW 256 September 30, 2020 04:33PM

Re: Get your tickets.........

NWCindy 212 October 05, 2020 06:58PM



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