Question for CZ20-21 users.

[Greg (E.Tn)]

I water hunt with the CZ21 a bit, and search in autotune, then switch to the discriminate mode to check whether or not to dig, basing my decision on tone.

I dig only mid and high tones.

I have yet to dig a gold ring that gave a mid tone- though I have dug lots of aluminum ringing in with mid tomes. All of the gold rings are coming in with high tones.

Is this typical?

Thanks in advance for the help.

 

[tvr]

In my experience, a high-tone gold ring is not the usual gold ring. Nearly all the rings I find are mid-tone.

If the ring has a conductivity right at the conductivity for a nickle, it will high-tone. The nickle range is a narrow range of conductivity. If the gold rings you find are all very big rings, putting them at the zinc cent and up conductivity range, then WOW, you must be killing it with big rings.

I think I'd try testing a nickle, zinc clad cent and a pull tab or two from some soda cans and see where they fall. I'd expect the tabs to be mid-tone and the nickle and zinc cent to be high tone. A zinc cent eaten up by corrosion frequently comes in mid-tone; but one in spendable condition, should high-tone. If the nickle and other test targets give expected results, I wouldn't worry and would just keep hunting.
Cheers,
tvr

 

[adamBomb]

Depth and mineralization play a role in the sound on the CZ21. I would test your machine via air test on various rings/metals at various depths and see what is normal for your machine.

 

[Greg (E.Tn)]

So far, in freshwater hunts, all of the aluminum targets ranging from tabs rings, and larger aluminum targets have come in with a mid-tone, which is to be expected.

Clad coinage rings in at a high tone.

All of the gold rings I have found have been given high tones--at the same time however, all of them have been larger rings (men's wedding bands, class rings, etc.,) in the 10kt-14kt range.

I have yet to dig a thin gold (ladies) ring, even though I have been faithfully digging all midtone targets.

Which brings up another question:

default tones.

If a target is lying at or past the depth limit of the detectors ability to identify the target, will the machine default to an iron tone?

Again, many thanks for the advice and input.

 

[tvr]

Sounds like the detector is just fine! And congrats on the big rings.

As targets get deeper, they tend to identify lower in conductivity. Not a default to low-tone, but deep gold that would normally come in mid-tone sometimes detects as low tone or may bounce low to mid. If it is past the ability to detect in ID mode, you may detect it in auto-tune (all-metal mode). I've had some targets sound in auto-tune and when I go to check them in disc 0, I get nothing until I've scooped an inch or two of sand off the top.

Couple of years back, OldBeechnut posted a video where it showed a deep planted ring go low tone. Here is the link: http://www.findmall.com/read.php?23,1625643,page=1

 

[Greg (E.Tn)]

The environment where I'm detecting is a shallow river that has three commercial tubing businesses located on it; they ferry tubers back and forth all day long over about a half-mile or so stretch of river.

One of the rings was six inches deep in the river bed. It was hard to recover in the rock and gravel bottom. If I remember correctly, it gave a high tone, but was a 10kt men's class ring, so it had some size to it.

My curiosity often gets the best of me when I hear a low/high, or a low/medium tone bounce, so I have been digging them, only to find the targets either large iron, or aluminum.

So far, all of the medium hits have been aluminum.

It has been constantly in the back of my mind that some of the fainter low tones "might" be a deeper gold ring, or even a narrow band that is below the discrimination capabilities of my detector.

Again, many thanks to all for their advice and kind words.

 

[adamBomb]

When its deep the disc begins to falter. On those deep autotune targets you may need to sweep away a few inches off the top to get a stronger signal that you can identify.

 

[Greg (E.Tn)]

n/t

 

[tvr]

Iron can go low to high tone. A fast sweep can give mostly high tone on bigger iron. A very slow sweep over it will normally leave it at low-tone; although I have had some big pieces still bounce low to high. AutoTune will let you size the target to see if it is big. With more time on the detector, figuring out what is really iron becomes more apparent. Aluminum is not as straight forward.

 

[chinacash]

Gold should be Mid Tone as far as I can see with mine, unless it is very large. Be great if gold was high tones and tabs
were all mid tones.

 

[adamBomb]

Gold should be Mid Tone as far as I can see with mine, unless it is very large. Be great if gold was high tones and tabs
were all mid tones.

Some gold will ring exactly the same as pull tabs even on machines with 50 tones. We do not have the technology to distinguish them apart.

 

[icurabeachguy]

I've had at least one instance where I've found a combo 18k/Plat Cartier ring that was a solid high tone. Up until that first ring I found, I was mostly ignoring high tones but that day was so slow on targets that I was digging everything...glad I didn't skip it because I wouldn't have learned that not all gold or plat is mid-tone.

if it's deep gold or plat, it can hit as a low tone. as others have said, I usually swipe a few inches off the top, resweep and size with autotune to make sure it isn't a big chunk of iron deep down. if the tone changes to mid or mid/low bounce, I keep digging/sizing.

 

[twcook]

I am not sure how much mineralization might have on the tones for gold but I just have one hunt in with my (new to me) CZ 21. I found a a 18k 2.6g wedding band that sounded exactly like pulltabs in the wet sand right at the edge of the surf. Both were mid to hi tone bouncing here.
The only other place I have hunted with this machine was 2 hours at South Beach in Miami, where I found $0.69 and some broken sunglasses. This beach is very heavy mineralized compared to SB.

At SB. I had no need to GB. Here the machine won't even fully GB. Though I am not sure I have tried everything correctly. I'll take the instructions out with me next trip.

BTW: When I say here, I mean: Balneário Camboriú

 

[Greg (E.Tn)]

Haven't dug anything gold since starting this thread, but will report back if/when I do.

Thanks again.