F75 LTD pinpoint feature

[osgood]

Have a question on the pinpoint feature of the 75LTD. Sometimes Ive gotten promising signals and go to pin point. Then the pinpoint reacts as if there is nothing there, it doesn

 

[BuckeyeBrad]

and to be sure, you can do a few things to confirm. "X" the target in disc mode and dig it (and assuming it'll be a rock) then pass it under the coil to confirm that was the object giving the response. Also you can switch to all metal and listen to the target (still in the ground) for a dead givaway.

 

[gmanlight]

Adding to what Brad said i you are digging ghost holes turn the sence down a little . Luck

 

[jim tn]

n/t

 

[tvr]

One thing I've done multiple times, unintentionally, is have the coil directly over the target when I pull the pin point trigger and the detector retunes and I hear nothing.

I need to move the coil off the target and pull the pin point, then sweep to locate.

If I'm pinpointing and the target seems bigger in pinpont than it seemed when just sweeping in discriminate mode, then I intentionally retune (or detune). To detune a target that pinpoints large and you are pretty sure it's smaller, get the coil near the target but not directly over, momentarily release the pinpoint and then pull the trigger again and it will retune (or detune) some but not completely getting rid of the target and the target area will now be smaller with the pinoint. If it's directly over the target when you detune, you may not get a signal in pinpoint.

Not sure if that's what's happening or as Brad suggests. I have not had a lot of hot rock problems with the F75LTD, but have hit some.
tvr

 

[Cal_Cobra]

I've experienced this, I had to dig some of them to see what they were and it's always been iron. I always figured this pinpoint nulling on iron was by design, as 98.9% of the time if I do dig iron (and it pinpoints), there's a good target co-located in the same hole.

Never had a hot rock issue with my F75 LTD (now my Coinstrike was another story, it loved hot rocks. RIP ).

 

[BuckeyeBrad]

I'm gonna need that explained to me. I've seen what TVR mentioned and he's right....if you press (or toggle) the pinpoint and you're over a ferrous target or still within it's influence, you very well won't hear a nearby non-ferrous target....but nulling OVER iron?

 

[Cal_Cobra]

I'm gonna need that explained to me. I've seen what TVR mentioned and he's right....if you press (or toggle) the pinpoint and you're over a ferrous target or still within it's influence, you very well won't hear a nearby non-ferrous target....but nulling OVER iron?

That's exactly what I see. Many times I'll get a high coin'ish signal, maybe it's iffy, maybe not, then go to pinpoint it and nothing, instead of displaying the depth, the LCD display shows "--" with silence. When I first got the LTD, I dug several of these "nulled" (for lack of a better term) pinpointed targets, and each one was iron. I thought it was a slick feature, maybe my machine is the only one that does it eh

 

[Scully]

We have two kinds of hot rocks here in Wisconsin, what I call positive ones, and negative ones. The positive ones sound solid and repeatable, on my machine they always come at an ID of "8". The negative ones will actually bounce the threshold negative, and you will hear the machine give a rebound "beep", but off to the side. Its like you cant find the center, ite beeps on the outer edges of the target from the recoil of the machine retuning. Thats when I see the "--". But I have never seen the "--" over an iron target, I always get ID numbers, either low, or very high (92+) for bigger iron objects. Cal, you may have a unique feature. Have you noticed, on iron targets, does your Iron meter spike over the target as you sweep it? Thats another give-a-way that the target is iron. But you have to watch the iron meter while you sweep over the target.

 

[BuckeyeBrad]

and I even have a couple fields that read a 1 (not .1) on the Fe3O4 meter and when I press the pinpoint over target free ground, it always still shows a ferrous object as ferrous or a high false. If you get the chance to further observe that in more detail, Brian....please keep us posted.

 

[Cal_Cobra]

We have two kinds of hot rocks here in Wisconsin, what I call positive ones, and negative ones. The positive ones sound solid and repeatable, on my machine they always come at an ID of "8". The negative ones will actually bounce the threshold negative, and you will hear the machine give a rebound "beep", but off to the side. Its like you cant find the center, ite beeps on the outer edges of the target from the recoil of the machine retuning. Thats when I see the "--". But I have never seen the "--" over an iron target, I always get ID numbers, either low, or very high (92+) for bigger iron objects. Cal, you may have a unique feature. Have you noticed, on iron targets, does your Iron meter spike over the target as you sweep it? Thats another give-a-way that the target is iron. But you have to watch the iron meter while you sweep over the target.

I'll have to pay more attention to the Iron meter the next time it happens (it usually happens a few times per hunt). I've felt the LTD in BP mode has been outstanding in iron, I rarely dig iron (unless I'm going for the fringe/iffy stuff, then a few get through). When I do get a good tone and dig a nail or such, I almost always find there's also a good target in the hole (usually a coin) and that the LTD completely ignored the iron