Rookie question about coin response.

[mogo]

Hi folks,

I am a real rookie. Maybe 10 hours total on the X 70. I have not been very successful and I did not expect to be because I have learned from you pros it takes a great deal of time to get to know your instrument.

I wanted to know if this is normal response for air tested coins and should this be the same for in the soil?

With a modern penny, silver liberty half, silver dollar, clad half, clad dime, V nickel , regular nickel.

Here is what I observe. As I approach the coin as the outer coil (standard 7.5K) is about to go over the coin I get ferrous iron signal for all coins.

As the coil passes the outer coil and approaches the inner coil I start to get the appropriate ID number intermittently, then as the coin is under the center coil I get a solid ID for the coin (except nickels seem the least stable).

As I keep move past the coin towards the back of the outer coil I get the reverse

 

[khouse]

I think you need to move your coin faster in your air test. Also in the field it's good to pinpoint your target. Then sweep the center of the coil over it left and right fast only moving the coil about 4 inches. Then you'll get the best TID.

 

[claddagh]

Hi,
I'm also a rookie about 20 hours, but I've found that when its a coin in the field or similar small round object, the xt 70 has been spot on every time, just up or down sometimes with one number, when the numbers jumps around I've found if they are positive its usually a top of a tin can or similar, if there are negative and positive numbers its usually large iron.( or in both cases the sens is way to high)
But there are alot of experienced users on this great site who can answer your question better.
Just air tested a few coins sitting next to my computer ( but sens only 12)and it works fine like khouse say you could be moving the coin to slow.
HH
John

 

[NH Bob]

Don't give up on those jumpy #s when hunting old farm sites. Specially if they hover around the 30 and up numbers. I've dug plenty of old coppers in the 10"+ range that didn't ID right until I pulled a sizable plug.

 

[mogo]

Thanks for all the excellent advise. I was getting a little concerned I never saw solid ID numbers, but now I understand things a bit more. I also have the 18 k DD and 3 K coils coming.

I have some awesome sites to hunt. Two are vancant lots where pre 1920 one room school houses once were. Another school that is closed but was built in 1930 (now privately owned) and a "town" made up of 5 or six buildings (post office/stores shown on a 1926 map) but is now a dirt parking lot for semi trucks.

I do not believe any have ever been MD hunted before because I asked the owners if anyone had ever asked to hunt them and they all said no one had ever asked before. We will see My biggest problem now is finding the time to hunt them.

 

[NH Bob]

n/t

 

[mogo]

[quote khouse] Also in the field it's good to pinpoint your target. Then sweep the center of the coil over it left and right fast only moving the coil about 4 inches. Then you'll get the best TID.[/quote]

OK, I had about 4 hours this morning and that little piece of advice did the trick. I was able to find and ID prior to digging some common coins in very trashy area.

Much thanks for all the help and advice folks.