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Quite an interesting subject......concentric v dd and the shapes of coils.Have we really got a grip on the advantages and disadvantages of all the different designs?
Exactly what i found on my garden test bed with targets that had been buried for a long while......some detector/coil combinations i thought would do really well did worse than combinations i thought wouldn't do well.I've had times while comparing targets where a DD will miss what a CC will hit but then vise versa. I can't say one is better.
The same goes for the detector we're using at the time.
Hell, if there was no challenge then it would just be work digging.
I have also found that DD coils hit co-located targets better then a concentric. I have found, though, elliptical concentric coils might be a good compromise. Concentric's do seem to get a little more depth then DD's of the same size and being elliptical shape do pretty well on co-located targets.I have found that it is easier to find co- located targets with the DD coil. T
Lol.....i was getting a bit confused listening to you talk about the football shaped coils......i forgot your footballs are different to ours.I used an 8×6 sef coil on my mxt and it was a cracking coil.My favourite ever coil was the little joey the 10×5 "football" shaped coil that i used on my Sovereign......fantastic coil on the sov,never had the problems you experienced with this shaped coil.......maybe the joey is just suited to the sov.To better answer your original post (sorry for drifting off subject) Thoughts/likes on coil shapes- my favorite is a more rectangular elliptical like the sef butterfly or the 11" fisher & n/m coils. I feel they cover an area quicker than round ones and give deeper more consistent signals than a football shaped elliptical. I like the large round in clean areas when more depth and time isn't an issue, the medium sized 9-10" round coils are similar to the rectangular and the small 6-7" are my choice in higher trash. My least favorite by far is the football. I think it gives the worse of both the round and the rectangular ones. I seldom use/own the footballs.
The Teknetics omegas have a huge selection of coils also.
That's not what the OP was asking for.Here is what Paul Wilson said years ago.
It's the exact opposite for me. I've used both and prefer round most of the time.Elliptical for me......don't find any real depth advantage with round coils and ellipticals pinpoint better.
Sorry,I didn't read the wording correctly. My Bad. So much for trying to help others with so many questions.That's not what the OP was asking for.