Mystery hits, any thoughts?

[radarwill]

Hello all,
I hunt with a GT and occasionally come across a signal that pinpoint kinda strange and wonder if other has seen this.

I'll be hunting in DISC mode with the DISC knob turned to zero level as usual.
I'll be swinging and get a solid high tone. I do several sweeps to insure it's not a big hunk of iron, and if it passes that test I do the same thing at 90deg. When the tone is solid in both directions I know where the center of the target is and I put my coil directly above it and switch to AM mode to exactly pinpoint it. I would expect to be on the "peak" of the signal but sometimes it very weird.
Rite where I think the peak is, is actually the null and moving the coil in any direction gives the "ramp up" to a peak.
I hope you can get the gist of what I'm experiencing.
Is this a flat target of some sort on edge?
Anyone know what I'm talking about?
Thanks

 

[Cal_Cobra]

What do you find when you dig the target ? I've noticed the same thing before, and there's usually some iron in the hole too (small rusty square nail fragment or such).

 

[radarwill]

I've yet to dig any of these signals for one reason or another.
I'd be more apt to dig these if I had a Sunray probe.

 

[Bling]

i think if you switch to am while over the item it will null the item as it tunes to the item and not the ground.try placeing a non metallic item over target,and raise the coil before you switch to am...then drop the coil and chech..if your GT is working right it should null on iron in disc mode? i have had my GT go nuts on hot rocks.

 

[Art (NWOH)]

It sounds like you had a perfect pinpoint in disc mode. Sounds like a perfect match.

It's when the target is just too wide or pinpoints don't match that it should be considered junk, or a good target with junk.

You are saying that you get the same thing that I do on a regular basis.....that the pinpoint in disc mode was dead on, and requires no change to am for a pinpoint. I seldom use am pinpoint because it is totally unnecessary much of the time.

A lot of times I work the coil forwards and backwards over the target while using a narrow sweep then split the difference where I lose the signal. No "X", no front or back of the coil, no am mode. It's right in the center.

Remember that both am and disc mode are motion modes.

HH

 

[joecoin]

Will, I just bought a probe for this very reason, these kinds of targets are driving me nuts.

 

[Rick(ND)]

One of the things I do to check if it is a good signal or not is to see the area where it sound good in disc will move or not by going over it from a different angle and try to keep the signal on the tip of the coil, it is is moving it is a false from iron. Now if it is still questionable I move the coil away from the target before I switch to pinpoint and now go back over it in all metal pinpoint and if it now nulls in the same place or a one way signal it is iron false I am getting. Now if it still stays in the same place it can be good so I will pinpoint going side to side, pus the coil to the ground so it don't move off that spot and turn 90 degrees and go side to side again to pinpoint it. The target will now be right in the very center of the coil if you pinpointed correctly. Now i will hold the coil still right over that exact spot and switch back to disc and slightly wiggle the coil if it nulls it is iron, but if the tone stays the same or starts climbing it is one I will dig. With the GT I notice sometimes it may null just a little with a slight wiggle, but sound great if it is wiggled a little more.
This works great and helped me find many very deep coins that were questionable.
Like I say when switching to all metal pinpoint and it is a one way signal or don't pinpoint where it does in disc it is iron or iron close to a good target in which case you may have to pinpoint in disc by going around the target and see if you can keep that tone in the same place on the tip of the coil.

 

[joecoin]

Rick,

You say "...I switch to pinpoint and now go back over it in all metal pinpoint and if it now nulls in the same place or a one way signal it is iron false"

I did not think the GT would null in all metal?

 

[Art (NWOH)]

Rick may be having a bad day.
If you pinpoint in all metal, then switch back to disc mode, if it is iron, then it will null. Just don't move the coil when you flip the switch.
HH