synthnut said:
Critter,
To sum it up , would it be safe to say that the 12 x 15 SEF is deeper and a better Beach coil ? ......Would it also be safe to say that the 10 x 12 is a deeper land coil ? ..........If you hunted both land and beach 50/50 and it was really more important to have a coil that would go deeper on land , which coil would you go wtih ? .........I'm saying deeper on land, because the beaches that I hunt , I don't really have to go down that deep unless I go into the water, and I'm not sure how soon that is going to happen .....The stock coils on both my E Trac and my Sovereign are adequate , but I want more than "adequate " ...Thanks, Jim
If I was more of a beach hunter than land hunter I would have kept the 15x12. It went much deeper than the stock 10" coil in the sand, the coverage was awesome, and I liked all other aspects of this coil better (audio, separation, pinpointing, stability at higher sensitivity settings, etc). However, I am not primarily a beach hunter. My first love is old coins, and probably my second first love is ring hunting on land....then it's the beach for rings. All in that order.
So, based on the fact that the 15x12 would not go as deep on land for me, with about 9" max on a coin seeming to be the norm in my higher mineral land sites, I decided to get rid of it in trade for a 12x10. Had I had the money right now I wouldn't have traded that coil. It would have been just for my beach hunts or perhaps covering very large areas such as crop fields. But, on land the stock 10" has got me coins deeper in my soil than any other machine or coil I've ever used. My theory is that the high mineral content of land sites is overwhelming the target and washing it out in the ground matrix with the 15x12. Note that I'm not saying it wouldn't run at higher sensitivity settings while being stable compared to the stock coil, but as I've pounded away over and over higher sensitivity DOES NOT mean more depth in my soil.
Kered, if the volume thing was an issue then why would the 15x12 be getting me coins twice as deep in the sand than on land? If anything with the volume down I can hear it less well at the beach due to wave action than I can on land. Besides, I've tried full blast volume on land at known deep coin spots with the 15x12 to insure that wasn't an issue. And, as I've always said, each and every one of the deep targets I've found via full volume while hunting I could easily hear when I turned the volume all the way down to compare. There is no difference in depth ability IMO with at least these headphones and my hearing. So long as the target can even slightly change the threshold I can hear it without issue, no problem at all.
My main belief/working theory at this time is the ground matrix of my soil. A bigger coil WILL pass the point of deminishing returns at some point, otherwise we'd all be hunting with coils 5 foot in diameter. The question of where that point of no return is is largely going to be determined by the kind of soil you have in your area. I know the limits for me where I live. That's the whole point of trading for the 12x10. Since I'm primarily a land hunter I want to see if I can maximize my depth in my high mineral sites. I believe the 12x10 may even be seeing less ground than the stock coil in terms of left/right wasted bleed off into space due to a sloppy detection field with more "stray" unneeded signal in that perspective on the stock coil. In that sense I'm hoping the 12x10 will see deeper, being less washed in ground matrix, and thus be less prone to degrading target quality at depth. I'd further add that if my theory is right then the S-12 will get less depth than the 12x10 in my soil, and perhaps even less depth than the stock 10" coil. The S-12 is a conventional DD design, and so it doesn't have the width of the detection field squeezed like these SEFs do.
That's my whole point and working theory. Only comparison and time in the field will prove it one way or the other. If anything, even if this coil only goes as deep as the stock coil I'll still be happy. The stock coil is one deep puppy. But with the 12x10 I'll also have the other benefits of an SEF- better separation, better pinpoint, higher stability at higher sensitivity settings, improved audio response, better ability to hit coins on edge or in trash, more coverage (LOVE IT just like the 15x12 over the stock 10" coil...feels too small now), etc.