A Few Tests To Try...

[Critterhunter]

I read something about this elsewhere and it really got me thinking about how many coins are masked. Take a dime and lay it on the ground, then place a cup upside down on top of it. Now take a staple (the type used to staple papers together) and lay that directly in the middle on top of the cup. The dime should have also been placed directly in the middle of the cup. Sweep over it and see if you can read the dime through that tiny staple.

Another interesting one to try is to lay a nail directly over a dime and then sweep at it from different directions. Notice you can't get as good of a coin signal when the coil signal it 90 degrees to the nail. If the detection line of the double D coil is parallel to the nail you can get a much easier coin ID. That's why sweeping a spot from two or even three different directions is a good idea.

I haven't tried the cup trick above yet but if you do let us know what happens. If for some reason you can read the dime then try a nail in place of the staple, but I doubt you'll be able to get a reading on the coin due to the detection field hitting the staple first and being deflected. Line of site is everything.

 

[GunnarMN]

critt, thats why I clean out all surface Iron if I can i have found coins masked by Iron , and the Iron assurs us that those to come will have coins when the Iron has rusted away

 

[JimmyCT]

Critterhunter,

I completely agree with you on this. I have not performed the test, but have seen it "live" in the field. I hit a small area and found a few wheat cents. The next time I went back and swept from a totally different direction and found two Indian Head pennies. example, a half acre searched becomes and acre hitting it from two different directions. Seems like a lot of work but I feel it will pay off from possibly not picking up coins and other goodies from the original sweep direction.


Another interesting one to try is to lay a nail directly over a dime and then sweep at it from different directions. Notice you can't get as good of a coin signal when the coil signal it 90 degrees to the nail. If the detection line of the double D coil is parallel to the nail you can get a much easier coin ID. That's why sweeping a spot from two or even three different directions is a good idea.

 

[BeachBat]

Part of the reason for me buying the SEF coil was the potential ability to see more masked coins than I may have done with the stock.

Here in England coin masking is a massive issue because of modern coinage - 1p and 2p coins will null - the latest 5p & 10p coins sound pretty horrible audio wise. So on a big pocket spill the