big hole-no find??!

[Anonymous]

At a park today using my cz-5,I got a coin signal that sounded real good.It read at 4"deep and I mean it sounded very good.After digging a hole 6" wide and 9" deep I finally gave up.The signal still sounded good and the meter was still registering at 4" dead center of the hole.Usually a deeper coin is easier to pinpoint that a shallow coin,but with this detector I'm still getting a signal accross the entire center hole of my coil.
What am I doing wrong?

 

[Anonymous]

I think you have discovered the dreaded Hi-Coin false signal of a rusty nail or other piece of ferrous trash. If it's indicating a depth of 4" and you're at 9" and it's still not there then it's either a big piece of something (like a can maybe) that's much deeper or it's a rusty something. One thing that can tip you off is the size of it when you pinpoint. A coin that deep would have a very small "trace" when you pinpoint it. Also tip off to rust is if the targets "moves around" on you when you pinpoint it.
A big help to me in determining what I REALLY have is to NOT notch out iron. If you have iron notched out and you're getting hi-coin falses you will only hear the hi-coin tone. With the iron notched in you will likely hear both...like hi-coin in one direction and iron on the backswing. With that info and the other tips I mentioned you can learn to make a more educated decision on whether to dig or not. Or at least help you decide to "call time of death" on the hole a little sooner than you did on this one. Hope that helps.

 

[Anonymous]

........ a magic number with my CZ. Your situation is all too familiar to me!
Raise the coil about 6" or so. If the signal weakens it's a small target. If it's still loud and clear then it's deep iron.
Give it a try.
Chet

 

[Anonymous]

Then your saying not to use the notch as discrimanation and only use the meter,but if I do that my detector will sound like a machine gun.I never had problems with pinpointing when I used a whites detector although I didn't feel I was getting the depth.I read where alot of people say that if their fisher meter reads nickle it most always is a nickle,but with mine its almost always a square tab to the point where I don't dig nickles unless there is depth and usaully still a tab.

 

[Anonymous]

I've dug very deep pop/beer cans that were probably close to 12 inches. The only thing that kept me digging was my UniProbe was telling me something was starting to get close.
-Bill

 

[Anonymous]

Could be a coin on edge, but doubtful with the crater you dug. On the CZ5, you are better to keep iron signals ON, as you can better tell the false positives, just as Mike describes. I only ever disc out iron if I'm getting too much chatter, abd even then I would rather turn down the sens than mess with the disc.

 

[Anonymous]

and you mentioned that the machine would sound like a machine gun without higher disc settings and it appears you are using the 8" coil in a high trash area.Perhaps you should have the 5" coil on your cz5 in this situation.Another observation is the 6" wide X9"deep hole and registers good at 4".I once had an axehead on angle about 5"deep and a foot away from what seemed like a good pinpoint until i realized i was getting good pinpoints at random spots near the supposed good center.In a high trash situation i run sensitivity at 1 or 2 with a 5" coil and still get dimes at 5 or 6".Mike gave an excellent observation on the iron response but if your being totally plagued by aluminum trash you should run higher disc settings but double and triple your pinpoint location and raise the coil about 6+" and see if the target is still there and if so it is probably a large target.I'm trying to help a buddy who is having troubles hunting trashy parks so your dilema hit home a bit <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=""> HH Bill

 

[Anonymous]

This does sound like a big deep target but if it's a <span style="background-color:#ffff00;">coin on edge</span> here's what I do. I scan the hole in many different directions listening for a telltale second beep. It can be very small and it will "usually" pin point. When I find that second beep, I know that my target is in between the 2 beeps/pinpoints. I have found many coins recently using this tecnique. I know I have missed these coins in the past.
As far as pinpointing with the 8" coil. I scan the target in pinpoint mode in all 4 directions. The sound will drop down just as the coin leaves the edge of the inner ring. By going in all 4 directions and observing where the sound starts to drop out, you can get an accurate pinpoint. If the sound stays loudest out to the outer ring, then it's a large target or a very shallow coin. Just my experiences with my 3D.
Dave

 

[Anonymous]

Personally I think if your running with high sensitivity you may be hitting the edge of a deep large target( perhaps a buried 57 chevy) man CZ is a poweful machine..
Second you may be hitting a rustynail a foot or so deep that to an untrained ear sounds like a coin and doesn't give a accurate depth indication. And yep a trained ear can be fooled also.
Last but not least CZ's are depth demons and are user friendly to setup, but takes a while to learn their language. Hang in there and when you dig that exceptional deep silver coin you will be hooked..

 

[Anonymous]

I believe Mike is right, open up the iron notch and you will probably find that it is a large piece of metal. also if you raise your coil up 6 inches and still get a strong signal that is another tip off that it is large.

 

[Anonymous]

My set up on the cz-5 was audio at 4.5,sens at 2,gb was bobbin at 6,disc at 4.The signal was a small double blip that sounded like a coin,it was not a strong loud sound like a surface coin or large object,it started out that way and ended that way.
I hunt a park thats around 120 years old and full of tabs,wine caps and pipe shop soil with slag and small pieces of scrap iron.Its a hard park to detect,but has yielded nice items over the past twenty years.Searching this park with no discrimanation is very,very hard to do.

 

[Anonymous]

And it seems your hitting on about all the questions pertaining to your original post of pinpointing and all the responses are from experienced operators that have had the same responses your describing.
I would like to say about the same thing they have said as I also have had the exact same kind of thing happen and I also have used many other detectors such as mxt , minelab etc and the cz is its own thing not any other of the types so I make no comaprison I only use my cz as its own thing.
so here goes.
You mention you swing over the hole and get a signal over the entire hole . now if you raise the coil several inches over the hole and the signal does not reduce to a much smaller area as you swing over it it is definitely not a coin or small target as the cz is no magic detector it will show a coin as a small target and smaller the higher you lift the coil. Not notching out iron will allow you to see if there is iron in the hole .And if there is you may be detecting it and it may be big and deep.
Reducing the senstivitiy of your detector should also reduce the coil foot print and also depth. So when raising the coil you should get a smaller blip signal off the target if it is a coin or small target versus a big deep metal object. Finally to satifisfy your curiousity and to see how powerful the cz is just dig the target up like most of those experienced users who have answered your posts.
Finally another clue is that depth measurement.
The cz depth is designed to measure the depth of coins (meaning coin size and shape and metalic contents of coins) If you get a depth on a coin size object that is 4 inches then you should be digging something around 4 or inches deep or close to it. When you dig way past 4 inches deep and don't hit it you naturally should suspect inproper pinpointing or something else such as big real deep target which comes from raising the coil near out of the normal coin detecting range and still getting a signal. As mentioned above in the other posts.
HH
Dan R.

 

[Anonymous]

Dan,I didn't say that on this target I was getting a signal over the entire hole,in fact I said that I was getting a small blip over the center of the hole I had dug.What I said was that most of the time I got a reading accross the center hole of my coil on most targets.Maybe I'm confusing everyone.In this instance,I was getting a good small signal over the center of the hole that sure sounded like a coin.In the past with my whites I could tell a good coin signal and pop the coin out using a screwdriver without cutting a plug.
If you notice my sit up in my last post my sens. was set at 2.You know maybe I'm not use to the greater depth of the fisher,but the meter says it was 4" deep.I feel like the signal I was getting was a coin,but just maybe my pinpointing is way off.
I want to take this opportunity to thank every for their interest in my problem.I really appreciate all the help.I just wish I had someone with good Fisher knowledge that I could work with once and I feel I would learn alot.

 

[Anonymous]

That sounds like a real mystery signal to me when it can be a small blip over the entire center of your coil which is pretty large. I wonder where the bottom cone shape comes in. It can only be a real large item real deep or something being hit on that is really not being hit by your center small coil but a misplaced pinpoint object being hit outside the center of the coil. Possibly with another part of your coil entirely.
I had hit on a real big signal today using a big coil on my cz70Pro and it showed several inches wide and also hit as two targets like a elongated metal piece swinging from a different angle of approach. When I started to dig the ground then I had a real hard time pinpointing . I did not dig real deep like your problem but still just a mystery of such big signal when I finally dug it and found it , it turned out to be a modern zinc penny that was so rotted away that it was about 1/3 actual size and very thin. there must have been quite a bit of metal leeched into the ground before I disturbed it doing the dig. The signal sounded like a coin spill , it sounded so good. Once the target was dug and found the ground was clear of any other signals. There are some mysteries just maybe won't get solved sometimes.
HH
Dan R.