Cibola: screw cap demon

[mark_ad1970]

I noticed the cibola really loves screw caps and I've dug a lot of them. This is a good lightweight machine,but working full time I have very little time to hunt,and certainly don't enjoy pulling these things out of the ground.The gti2500 (very good machine) doesn't have this problem,as it has size and notch imaging.All in all, the 'C' is still a good machine.

 

[Hombre]

mark

I hate screw caps, the aluminum ones especially as they fall in the conductivity range of a coin, the steel crimped rusty ones can be avoided with coil sweep technique. Like sweeping off center of the target near the edge of coil, that will usually break up the signal. Coins or other good metal will hang in there at the edge of the detection field on the outer edge of the coil... Or sweep your coil in fast short wiggles over the center of suspect steel bottle caps, that will break up the signal sometimes. Also by slowly raising your coil over the center of the target while still swinging your coil in short tight wiggles and listening how soon the target signal drops out is helpfull. Good targets will hang on to the signal longer as you slowly raise the coil higher while sweeping, and will indicate about how deep the target is located by how far above ths surface the coil is when the signal drops out. Of coarse, these techniques are to be used in the motion disc. mode.

If your detector has a true ground balanced, nonmotion, threshold based all-metal mode, you can use this mode to size up a target. Iron, large amd small (nails,steel bottle caps) will hang on to the signal longer and seem to have a wider signal. Good targets that are mid-depth and are not surrounded by nearby masking junk metal will pinpoint with a small, tight signal in the all-metal mode. Have fun & good luck.

 

[mark_ad1970]

Hombre,thanks for the advice.I think tweaking the discrmination would easily eliminate the screw cap problem.All in all,I love this machine,and the depth it gets on good targets is astonishing.Found about 12 wheats in my own yard with it.

 

[Hombre]

Hombre,thanks for the advice.I think tweaking the discrmination would easily eliminate the screw cap problem.All in all,I love this machine,and the depth it gets on good targets is astonishing.Found about 12 wheats in my own yard with it.

I should have asked what kind of screw caps you are having a problem with, as the aluminum ones would take a lot of discrimintion to get rid of, and you could miss out on some desirable target in that range of conductivity. I end up digging the aluminum ones only because I don't want to miss anything, especially the deep ones. Rusty steel old style coke and beer bottle caps, with small nail discrimination, can be taken care of with the coil techniques I discribed in my first post.

 

[finnfoto]

Cibola is a depth monster and yep it does eat up the caps.

All I can say is learn the machine. Grab up some of the caps and if your not going to discriminate them then listen to the tones and learn the tones. . The Cibola is an awesome machine and it'll do the job other high dollar machines won't.


I promise.

 

[mark_ad1970]

Honestly,I don't think any detector (including the gti2500) is immune to screw caps,as they overlap zinc pennies.

 

[DiGGER27]

Sometimes, I could tell a screw cap from a high tone coin signal because the coin tone is more full, or fully rounded.
Hard to explain but a coin signal makes my ears perk up.
That is with the standard concentric.

I switched to a 10X12 DD coil this summer and now they all seem to sound the same, again.