Here's my concern.

[Anonymous]

My dealer said that the ultimate machine for cache hunting is the SD series with an 18" loop.
I posed the question on this Aussie gold forum. The set-up they recommended was a SD2100 with a Coiltek 24" coil. After speaking with Mr. Bill at length and others. My only concern with the SD or the Deepstar is the tiny iron signals that the PI is naturally able to pick up. Is there a way to keep it sensitive enough to find an object at depth but not sensitive to tiny metal objects on the surface. The Barracuda could find the backs off of earrings, the Excalibur couldn't. The scarry thought of using a sensitive PI on land is the amount and variety of trash. A two box will eliminate the metal objects less than the size of my fist. Great and under certain conditions its the tool of choise.But what about all those "backs of earrings" sized targets in the dry ground. Will a larger coil size help eliminate the smaller objects that an 8" coil would pick up? Is there another adjustment in the deepstar that would help when larger objects are your main target even at depth?
Is there anyway one can tell the difference between a shallow small target and a deep large one with a PI?

 

[Anonymous]

Hi John I have a Deepstar and had a special 9 inch coil made for it . I also had a cuda. The bigger the coil the less sensitive you get to small stuff. I can find a piece of foil at 7 inches with the 9 inch and it will only go 2 or three inches on the big coil. I think this has to do with more delay on the bigger coils. This may not be the same on iron as a lower cond. metals (gold). I'm sure Eric can give you a more technical answer. But from my experiece the big coil goes deeper on things like cans and covers a lot of area in a sweep. Hope this helps HH Kurt

 

[Anonymous]

Kurt how have you been ? Long time ! <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT="">
It has been my experience with PI detectors, the larger coil does not necessary equate to less sensitivity toward smaller items. Going from the 8" coil on the Aquastar to the 11" coil produced noticeable increase in depth with small gold rings. This is also the same with the Beachscan going from the 8" to the 11" coil. I only have the 11" for the Deepstar, but I

 

[Anonymous]

JohnnyNy
The SD series detectors are made for gold detecting the 2100 has no discrimation the SD2200 has a discrimation but is limited...you would be best off getting a machine suited to your needs

 

[Anonymous]

It is possible to tell the difference between deep and shallow targets using an SD. As a general rule, if the target's signal first rises and then drops in pitch, the target is relatively shallow. If the tone first drops in pitch then rises, its a deep target. Another general rule, the larger SD coils give less depth on small targets and greater depth on large targets (than the smaller coils). I imagine you would hear a rather peculiar signal if you had a deep target directly under a small surface target.