Greater Depth in All-Metal Mode??

[bobm31]

I have seen several posts on this forum suggesting that you can obtain greater depth in detecting coins in the all-metal mode.

I conducted some air tests, using my Ace 250 with standard 6.5" X 9" standard coil, SENSITIVITY at 4 BARS (50%) for ALL-METAL mode, COINS mode and with discrimination "notched out" for detecting dimes only.

I used a dime and got 5" detection for ALL THREE MODES; therefore, I conclude that greater depth in the ALL-METAL mode is another myth

 

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[mvSWAT]

I haven't air tested mine like you did but I used my XLT on a sandy beach in coin/jewelry mode and thought I had cleaned the area pretty good, then I happened to put it in relic (all metal mode) and started finding coins and jewelry at a deeper depth...of course I started finding iron then also. Perhaps it makes a difference when your target has been in the ground and is producing a halo effect vs. an air test. Happy Hunting. Dan

 

[Willy]

There's a difference between what's called commonly "all-metal mode" and zero disc. With the Ace 250 the all-metal mode is not what's called a "true" all-metal mode, it's just zero disc. It is a ground filtered (2) signal which probably has some extra signal filtering to reduce crackle 'n such. A "true" AM is often threshold based and has very little or no filtering. Actually, there's a lot more to it and has been discussed on Carl's forum. I have 3 detectors (at present) and all of them have a seperate all-metal mode, as well as the zero disc. style all metal mode. One of them is a Garrett GTI 2000. With all three detectors there is a very significant increase in both depth and sensitivity when they are in the "true" AM mode. ..Willy.

 

[JakePhelps]

On ym tracker4 when you turned up the disc you loose depth.

 

[Monty]

I think air testing is a myth! I never have been able to correlate testing in the air with an object actually in the ground. All my detectors (4) will test much less in the air than in the ground. I only can get about 4 to 6" in the air but one of them will detect a coin at about a foot deep in the ground! Also, I have tested them on a gold ring and find it will "ring" up completely different on a gold ring in the ground as opposed to one in the air. In the air it will show up somewhere near the middle of the scale (penny range), but in the ground will show up in the nickel/pull tab area on the scale. So, I don't have much confidence in air testing. Is it just me or has anyone else reached this conclusion? I have also noted that a gold signal will tend to bounce while silver will remain almost steady. Monty

 

[Earl]

I don't think air tests mean doodly squat. Just my opinion

 

[bobm31]

I don't think air tests mean doodly squat.? Just my opinion

The way I did it, comparing modes, air tests are OK. Besides, I have done tests comparing air test depth to in ground depth (freshly buried) of coins and got comparable results

 

[slow sweeper]

? ? In my opinion air tests have no relation to actual hunting situations. I feel the same about freshly buried coins. And willy's got it right. There is a difference between "all metal" and "zero disc."

 

[Michigan Badger]

Willy did a great job explaining true all-metal mode.

As for air tests, the detectors I've owned got pretty much the same in-ground depth (freshly buried test target) as they did in the air.

One thing one needs to do while comparing is to use a plastic ruler and precisely measure air distance. One problem is that 10 inches in the air can look like 6 inches to the naked eye.

Testing in-ground is exactly the opposite. Dig a 6 inch hole and the naked eye will see it as almost 10 inches. The main reason being all the dirt piled around the hole.

A detector with a good meter really helps in distance or ground tests for freshly buried objects.

All detectors go deeper on long-time buried objects. The more corrosive the metal, the deeper it's detectability over time.

One reason I'm keeping my Tesoro is that it air tests about 9 inches on a dime and 10 on a quarter. I get the exact same in dirt. This will mean the potential of up to 12 inches or so for long-time buried coins. This is almost exactly what the UK diggers are claiming for their DeLeon (Hawkeye) machines.