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Coinsentric coil and speed

G

grumpy

New member
Good Morning I have a question about a coinsentric coil. I find they make a small one and I was trying to find out if they swing about the same and how they work. My other detector is a f75 and with a 10 inch coinsentric coil it works great to speed up and clean a park. Would the etrac with the small coinsentric coil tend to cover ground a little quicker and pickup in a broader area under the coil for like cleaning up a park after and event. I notice all the minelabs i have had are slow with this and not real top of the ground coin friendly. Any input appreciated.
Thanks
Grumpy
 
I have only used the concentric coil in Australia on the big gold machines. I just use the regular DD coil for surface coins swinging 6 to 8 inches above the ground. This gives you a wide area of coverage.
 
Grumpy,
If I'm understanding your question, you are asking if a smaller concentric coil would lower the number of targets that could be under the coil at any given time. The answer to that is "maybe" but it would take a really small coil and I think other factors will cancel any advantage when it comes to speed. The standard 11" DD coil that comes with the E-trac has a sensing area 11" long but only 1" wide. That's a sensing area of 11 square inches. Targets are sensed in that narrow strip. A concentric coil has a cone shaped sensing area that is as about as wide as the coil at ground surface level so a 9" coil would have a total sensing area of just over 63". (I hope that's correct. Anybody remember the formula to calculate the area of a circle? My brain is mush tonight.) So the likelihood of getting multiple targets under the coil at once is actually greater with the concentric coil. Here's another factor to consider. The E-trac operates at 28 frequencies, all at the same time, so processor speed is slower than many of us would like. It's a low and slow machine and there's really no getting around that. That was the hardest thing for me to get used to when I first tried the E-trac. I was used to the speed of the DFX and my old Garrett Grand Master Hunter and had a rhythm that let me cover a lot of ground. When I would forget and speed up with the E-trac I could cover plenty of ground but I wasn't finding much worth keeping because the processor couldn't keep up with my sweep speed.

Frankly, if you are wanting to do high speed clean-outs of shallow targets there are better detectors than the E-trac. I love the machine but fast it ain't. Then again, neither am I anymore.

Storm
 
thats pretty much what i thought. thanks for all the input. think ill stick to the brand x for higrading and etrac for the indians and deeper stuff in old sites.
Thanks
Grumpy
 
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