2 1/14 Hours with 12.5 inch coil. (Sorry forgot to photograph.)

[cwilk]

Thanks to Sasquach for the motivation in getting me to take my 12.5 inch coil out for a real hunt. If he could swing his all day I could try it for a couple of hours. I found a lot of coins many deeper than I am used to finding with my stock coil. I got 51 coins total and 17 were nickels which was more than any other coin. That doesn't happen often. I got half of an old knife and some pieces of some old toy cars.

I also would like to thank whoever came up with the idea of mounting the big coil backwards. It is a bit clumsy when setting the detector down to dig but it detects fine. The coil was pinpointing great and detuning worked fine. Depth was off about 1-2 inches when targets were below about 4 inches. I found 10-12 coins deeper than 6 inches that imaged correctly where the depth indicated 4 inches or sometimes 5 inches and coin was actually deeper. I mostly blame my technique for the inaccuracy. The ground was perfect for detecting too which probably helped with depth. Target ID was right on all morning too.

All in all it felt like using a new detector so I had a lot of fun even if the hunt produced slightly fewer targets than my average. This is the first ever hunt where I stuck with the 12.5 inch coil for the whole time and I have a site in mind for another try so it's still attached and ready to go.

Chris

 

[NM5K]

Reading depth a little under what it actually is may be semi normal with the bigger
coils.
I've noticed the same with the sniper coil. It tends to read higher than what the
target really is. IE: if it reads 4 inches, the target may be 2-3 inches.
It kind of makes sense to me, if they calibrate the depth reading using the stock
coil.
I'm not sure exactly how they are determining depth, but it's probably something
along the lines of signal strength vs the ID of the object. And I've heard that the
depth and ID are calibrated for coins as far as size.
So if a quarter reads normal on the stock coil, say 7 inches, if you used the large
coil, you would equal that strength at a greater depth. And in the case of the Ace
machines, the 9x12 gets 2-3 inches more depth than the stock coil.
IE: the signal strength of a coin at 7 inches on the stock coil might be equaled
with the large coil at 9 inches. So that would fool the machine a bit, and it's
going to go with it's stock coil values.
I'm pretty sure the machines aren't smart enough to know which coil is
attached to them..
Ditto for the sniper. The depth in which the sniper equals the stock coil
will be shallower, being it's a smaller coil. And it's going to fool the machine
into thinking it's deeper than it really is.
Or that's my semi theory anyway...