Discrimination and depth

[Larry (IL)]

Old school theory was the more discrimination, the less depth which was/is true where the targets were discriminated but with the newer generation of detectors, I wonder if that is really true now with the faster processors? Digger mentioned that just the audio is turned off on discriminated targets which makes sense and is what I have done on another detector and depth did not seem to suffer, I wonder if that is also true with the CTX? Have any of you done any testing on deep targets in regards of more or less discrimination?

 

[bcoop]

Good Point Larry,

If the accept and reject just allows or eliminates an audio report and the machine continues to still see all the targets, depth should be the same. I have always heard a machine will perform better with some discrimination rather than wide open, but with better processors and smart coils would this still be true.

BCOOP

 

[Digger]

Discrimination is when the detector identifies signals from a metallic object, then either sends the user an assigned tone for those properties set to Accept, or nulls out the Threshold on those target's whose properties were set to Reject. They're both detected. You merely programmed your detector to give you a tone on those with certain metallic properties and null on the others. What is different about the CTX 3030 is that it gives us the oppportunity to see an image of both Accepted targets and Rejected targets, simultaneously. So we can now "see" that an Accepted target is only different from a Rejected target in the audio response it provides.(tone vs nulling) With the ability to now "see" both accepted target and rejected targets, it would seem that discrimination has no effect on depth of detection. It is now simply a matter as to whether one wants to listen to the audio response programmed for each target property, or listen to the NULL of those set to reject. Regardless of your preference, both target types are detected and their images will both appear on the display. JMHO HH Randy

 

[tmanly]

All detectors no matter how old, only eliminated the visual and audio reports for any target that is discriminated out. It just add more time for the detector to determine if the response meets the allowed
settings to alert the individual. It has to know it is there and what it is before it can eliminate it. So yes a faster processor will allow for quicker response and less time allowed to see targets. It the detector is busy
trying to run calculations on a target and its phase angle, then it can not respond to good targets if you are swinging at a fast pace.........

Tom in SC

 

[earthmansurfer]

Great thread!

Just a point Larry and Tom, which is the one example I can think of that goes against the grain - the Deus loses depth and lots of it from running disc AND it is very very fast, as you know. It clearly is doing something quite different. Outside of that (and mayber other XP machines) I think the audio disc is in effect.

Albert

 

[tmanly]

Earthman, the XP machines are in a world of their own. Very special machines. I guess you can't get something for nothing. The speed and seperation of these machines are amazing.
But if you are looking for depth, then the Minelab is KING.

Tom in SC

 

[Niffler]

I seem to be having a related problem. Digging conditions in my test park (well hammered) here include ideally damp soil but with a lot of iron in it and since we get acid rain, most coins come up iron-plated, with sandwich coins the most heavily coated, usually showing an FE of 13-14. Iron-plated pennies will give me a CO of 45-46. I'm finding dimes easily at 10+ inches. BUT - my CTX3030 often tells me a coin is at 4" when it is really much deeper. I'll have a hole down 8"-10" accurately pinpointed and still be getting a nice clean tone and a 4"-6" indication. Digging a couple of inches deeper will either produce a coin or a buried can. I hate to go mining seriously to explore the parameters of the results I'm getting because the park is so heavily used; so I thought I'd post before getting out a back hoe. Any suggestions? Thanks.

 

[Ray-Mo.]

I have a silver dime in my test garden at 9" and now that the grass is about 2" above the dirt level the preset coins mode at manual 30 will only hit it faintly once in a while with multiple sweeps of the coil.However if I go to disc 2 open screen I can hit the dime with ease and get a good ID as well.....

 

[pspr]

I have a silver dime in my test garden at 9" and now that the grass is about 2" above the dirt level the preset coins mode at manual 30 will only hit it faintly once in a while with multiple sweeps of the coil.However if I go to disc 2 open screen I can hit the dime with ease and get a good ID as well.....

That's good to know. But it means I need that I'm going to need that giant sized lesche digger all the more!

 

[Larry (IL)]

Thanks Ray, it would be interesting to know why that is if it is just the audio that is being turned off in a null, but good to know on checking a deep maybe.

 

[Ray-Mo.]

Yes that is where it shines checking a deep iffy target

 

[Digger]

And that is why Pattern 2 is just a thumb click away! HH Randy

 

[earthmansurfer]

I have a silver dime in my test garden at 9" and now that the grass is about 2" above the dirt level the preset coins mode at manual 30 will only hit it faintly once in a while with multiple sweeps of the coil.However if I go to disc 2 open screen I can hit the dime with ease and get a good ID as well.....

Ray - Thanks for that test. I would imagine that the audio modes (e.g. - Combined vs 50 CO) would give the same results. I do wonder if running a minimal disc pattern would give the same results? (Could you try that please? ;-)

Your finding is further "proof" to run and open combined screen instead of the traditional E-Trac 50 CO with discrimination.

Thanks a lot for that,
Albert

ps - I wonder what the difference might be regarding unmasking???

 

[Ray-Mo.]

n/t

 

[Big Boys Hobbies]

Great test Ray! There is a reason gone hunting runs it open screen in his setting!