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CZ 3 D...................what do the non 1021's...............
Posted by: Ivan
Date: May 12, 2017 02:59AM
test at? What would be for example.......... an acceptable depth for an air test on U.S. clad dime? Silver dime? Or a clad quarter? If my unit hits a clad dime at 8 that bad?? I've heard that the Dankowski re tuned CZ 3d's have more depth but don't run as smooth suffer more this so? I guess all detectors would suffer in high mineral conditions..wonder how much worse the 1021's and the re tuned units are are compared to the latest production CZ3D's. Anyone care to comment? Thanks for your replies.

Re: CZ 3 D...................what do the non 1021's...............
Posted by: marcomo
Date: May 12, 2017 09:20AM
Ivan, I would say you would want a dime to air test at 11" with the sensitivity set at 5 which is approximately maximum depth on most cz-3ds. 8" on a dime would be a cold one.

When Dankowski tunes a unit, the main advantage is that he brings the various parameters where they should be so the detector IDs as intended. He can usually squeeze a bit more depth, but not always. Typical increased depth is between nothing and half an inch.

Likewise. he can often improve stability somewhat. His tuning definitely does not make the unit less stable. The stability of the unit, like the depth, is predominantly predetermined by the way the detector comes from the factory.

The 1021 and the early 1121 units are more likely to be deeper and more stable than the newer units. But that is not a hard and fast rule. There are "hot" El Paso units and "cold" Los Banos ones.

Re: CZ 3 D...................what do the non 1021's...............
Posted by: Dan-Pa.
Date: May 12, 2017 09:51AM
All depends on the CZ in hand and that varies...Tom tunes them more to spec's and for the most part are stable units but again they vary also depending on particular unit you send him...

Re: CZ 3 D...................what do the non 1021's...............
Posted by: Ivan
Date: May 12, 2017 10:30AM
So Marcomo, I've learned something new....I thought that the point of a Dankowski tune................was to add depth. Your saying there is much more to it than just depth increase. I'm surprised that the depth increase is "between nothing and half an inch"!!! You hear all these guys claiming huge depth increases on their CZ#D's after the re tune.....what's all that about??

At one time Fisher was using an improper procedure to tune a CZ............
Posted by: vlad
Date: May 13, 2017 01:18PM
this has since been remedied,
Tom states he tunes them to factory specs; that includes checking every aspect.
He does not modify them in some way by adding outside parts or using alternative tuning setup.
I do not remember the exact number but around 23 things are adjusted, in a specific order.
Each adjustment is relative to the one set before it-starting with the first one.
If a unit i somewhat unstable, then it is specific too that unit at factory standard calibration.

Re: CZ 3 D...................what do the non 1021's...............
Posted by: marcomo
Date: May 15, 2017 12:19AM
Ivan, I've never heard anybody who had Tom D. calibrate their detector say that they got a massive depth increase. Anybody who tells you that is mistaken.

The main reason to have him certify and calibrate is not depth. The main reason is to get the ID segments exactly correct. The increased depth and stability (when possible) are nice bonuses. Anything else like Tom cleaning components when the inside is dirty is likewise a bonus. But even an increase of a few tenths of an inch is nothing to sneeze at.

Tom has done four calibration/certifications for me. Two cz-3ds, 1 cz-5 conversion, and 1 cz-3d re-certification which was the most recent one.

The cz-3d I currently used suddenly and unexpectedly lost power when I was out detecting a while back. So I air tested a dime and it only got about 6". I checked with Tom and he said the only viable option for repair was through First Texas. I don't remember the exact cost of the repair off the top of my head, but it was in the high $100 range. What they wound up doing was replacing the coil and correcting what they would only call "component failure"

I have serious doubts that there was anything wrong with the coil. The outside coating of the wire I wrapped in electrical tape since it started cracking. That's a common issue with cz coil wires but it doesn't cause a problem unless the inside of the wires get wet. I think they just saw it wrapped with tape and automatically said replace. But anyway I got the detector back and everything seemed fine. It was originally Tom tuned to 12.0" and it seemed deep as before or at least close enough I couldn't tell the difference. So I wasn't going to shell out another $100 bucks to send it back to Tom for re-calibration. But I quickly found myself digging a number of unexpected zincolns that did not ID as zincolns.

So off to Tom it went for calibration/certification #2. The FT after repair depth was 11.6 and Tom was able to bring it back to 12.0. Also the zinc ID was "too zealous" which explained the unexpected zincolns, but all the other parameters were exacting.

Bottom line: if your cz-3d is a hot or relatively hot one, the $100 it costs to have it Tom tuned is well worth it because your detector will be improved and it should increase the price by at least $100 if you decide later to sell it.

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