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About your "Uniquethinking coil".

June 09, 2022 11:22AM avatar
A few years ago there was an unusual coil on Ebay which I couldn't resist buying. It's a Coiltek 6" DD for Fisher, with a serial number of 0001. The following is from memory: The seller said it was for the F5 (or maybe he said that's what he used it on). I had a Gold Bug Pro and asked him if it would work on it; he said he didn't know. I bought it anyway.

Obviously the coil seller didn't really know much abut the coil or what it was supposed to work on, or, like a lot of people, they think if the connector fits then it ought to work. We know that isn't so. But if a coil is designed for the F5, then it is also useable on the GB Pro, Delta, Gamma, Omega series, Euro-Tek Pro, F44 and many other Fisher and Teknetics models ... but not all of them.

I found on one of the online forums a post about another one, with serial number 0002. So I guess I can't call mine 'unique'! thinking Anyway, the story I put together based upon these two sources (Ebay seller and this poster) was that Coiltek and Fisher had an agreement to try a prototype coil and that after investigating a prototype unit (or two?) Fisher decided they weren't interested, and that was that.

Never heard about that but it wouldn't surprise me. I have tested quite a few 'protype' or 'sample' coils through the years and while some worked well, others left a lot to be desired. Often the issue isn't specifically with the coil but with the particular detector model and how the circuitry design works .. or doesn't work.

Back to my find. I put it on the GBPro and it worked, sort of. I found quite a few coins searching parks, but it would never ground balance properly, at least using Ground Grab. Eventually it ended up on the shelf (along with the GBPro) to be more/less forgotten, until....

A couple years later I was doing some in-ground tests with a couple buried coins -- 5" deep copper Memorial cent and 6" deep Jefferson nickel. The 6" Coiltek on the GBPro couldn't see either coin even though the Fisher stock 5" DD could. Hmmm. Back to the shelf.

Yes, not surprising at all. I checked out one coil and detector that would not Ground Grab, and couldn't even be manually Ground Balanced.

But recently I was doing some NBPTs and had an idea to try the coil on the F75. It worked (including ground balancing) and picked up the two buried coins! So maybe Coiltek made it (optimally) for the F75 in the first place. That makes a lot of sense -- build a coil for Fisher's flagship.

Oh, it didn't do great on the NBPT when mounted on the F75. I don't have the results with me (I happen to be writing this from Wells...) but from memory it signaled correctly somewhere in the 8 to 11 out of 16 range -- not as good as either the 5" DD nor the small elliptical concentric (4"x6"?).

Logically I would think a specialty coil would have been designed for the F75 series.

As for the NBPT, the #2 position is just for a little 'extra' performance information. It is the #1 coin position I relate to that has 8 possible good hits, one from the left and then the right along the 4 marked sweep routes. It is surprising how much of a challenge that 'test' is based upon both the search coil (its size, shape and type) as well as the detector (both settings used and the circuitry design).

BUT, I have it with me so if anyone would like to see it or try it out at the upcoming WTHO, you're welcome to.

I will be bringing my F75+ with the 3½X6½ Concentric coil mounted. I look forward to checking out your unique search coil.


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

Stinkwater Wells Trading Post
Metal Detector Evaluations and Product Reviews
I'm now 'back home' in Farr West Utah
monte@ahrps.org ... or ... monte@stinkwaterwells.com
Detector Outfit: A selection of my chosen makes and models, with the best coils mounted for the tasks I'll take on.
F75+ w/3½X6 .. Racer w/4.7X5.2 .. FORS Relic w/5" .. Silver Sabre µMAX w/6" .. Bandido II µMAX w/6"
Vanquish 540 w/5X8 .. Racer 2 w/5X9½ .. F19 w/5X10 .. Vista X (coming)
Pinpointers: Garrett AT Pro-Pointers .. Headphones: 'Hornet' & 'Wasp' .. MS-3 Z-Lynk
*** All working well today to make memories for tomorrow. ***

Edited 1 time(s). Last edit at 06/09/2022 11:23AM by Monte.
Subject Author Views Posted

Uniquethinking coil for Fisher detectors

GB_Amateur 421 June 06, 2022 11:03AM

Thanks for letting me try your unique 6" coil.

Monte 153 June 18, 2022 09:31AM

About your "Uniquethinking coil".

Monte 224 June 09, 2022 11:22AM

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