EXII threshold question

[mcb613]

Guy's I have a little question that I haven't been able to figure out myself. I was trying to identify whether the threshold briefly nulls before and after a good target. I have an Excal II and can tell the difference between tabs and gold... most of the time. But the excal is all about tones. Does anyone know or have any comment on the "just before" and "just after" good target threshold consistancy? Also, scratched a 1728 Louis XV half dollar size silver last week because it sounded and looked just like a crushed aluminum can. Anyone have any opinions on identifying between large silver and those horrible crushed alum cans? Thanks for the comments. Happy hunting! Mike

 

[Ron (CA)]

On a single good target the E2 should not be nulling before or after the target.

If a good target is mixed in with iron or any other target you have disced out, you could get a null on either side.

A null and then a high chirp (pegged top right corner) is often an iron false. If you wiggle tight on the target you can get it to repeat and sound great, but if you come off the target and let the threshold reset and then slowly pass over the target it will give you a better Idea if it is an iron false. Pinpoint it and if the target seems to be off to one side of the high tone it is probably iron. It is tough to hear with some headphones, but iron falses are actually a higher tone than silver and after a while you can pick up on the real high iron falses. A coin mixed in with iron still sounds like a coin. The cursor may be jumping, but hte tone usually is dead one.

On big aluminum, lift the coil 6 or more inches off the ground if the target is still reading strong it is big, if you loss it, it could be a coin target. You will get a aluminum can at 15-18" and it will still sound strong --a big silver will start to drop off as you raise the coil. Or just outline the target in pinpoint mode. The E2 will allow you to determine the size of the target if it is not too deep. A 12" can or part of a can will sound good and you will probably end up digging it out of curiosity. .

Just my two zincs worth!

 

[Philo_NY]

n/t

 

[utahshovelhead]

Hi 613,
If you are useing the ExII (not excal) the machine is a little bit early and slow with the null...I assume this is what you mean with your question. Still I found that if i slow down the sweep SLOW It would...sometimes be able to still hit on a close target within the edges of the null. Place some targets next to a pipe and try it. If it is too close it will not work. Within the fringe it does work. I had never noticed any null just before or just after any target response with my EXII, and if it did I would still have dug the target after some checking then rechecked the hole as always.
Usually if two targets lie closley swinging slow would in most cases identified that. not sure if I helped u or not.
good luck
utahshovelhead