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Accuracy/validity is paramount. The methodology in which something is tested can have too many induced variables..... some not quite so obvious. Unbiased honesty is also contingent. I know that I'm not infallible; yet, I like to police my own tests/conclusions. Conclusive analysis is more difficult to ascertain than most would think.
It is the collective concerted efforts of the folks on
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
The Vision has a concentric DD. The F75 is a elliptical DD. It should be a safe assumption to say that the elliptical DD footprint should be a much tighter/narrower ElectroMagnetic (EM) field-intensity/footprint. This is what enhances adjacent target separation.... exposing more targets in the ground. The one thing I'm hoping for with the White's ... is; will it go deeper in less-trashy
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Daytona Great Southern Beach Shootout #7. Looks like I will be there (work/job pending) on Saturday.... and have been requested to give 2 seminars. I will give 1st seminar on advanced beach hunting techniques -- per popular request. The 2nd seminar,,,, IF demand is high enough, I will give a 'technicals' extreme-relic hunting (will include coins) presentation..... to include heavy/in-de
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Yes, and at approx 60' radially outward from the iron nucleus..... and further out...... the coins/targets are just simply too deep for any (current) detector. This is where I still hold a properly tuned CZ-3D with large coil.... as the trump card for final raw-depth..... but only in areas where trash is sparce.
However; I did detect the iron nail infested pit which yielded many non-ferr
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
How do you think the detector would respond to the following targets at 7":
3-Cent Trime
Half-Dime
Quarter
Silver Dollar
Use your F75's Bar-Graph depth gauge! ((( I use it all the time ))).
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Mark, do NOT start/cut-your-teeth/maiden voyage with the F75 TOO hot....fatal mistake. It'll still surprise you.... even with lower settings.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
In a nutshell;
The elliptical DD 11" coil is approx 1.5" deeper..... on coin-sized targets (in the dirt)..... over the 9.75" concentric. The DD coil separates adjacent targets better (most all of the time), in most cases...the DD coil will handle bad dirt better. Both coils ID targets with nearly identical resultants. The DD coil 'falses' to a greater extent ... on ste
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Gosh, I'm short on time..... but this is something critical to report upon. A few years ago..... with one of the final proto F75's, I reported this phenomenon to Dave Johnson & John Gardiner, regarding this exact matter. I had detected a 1898 Indian Head penny at a measured 13" depth. In a controlled air-test, the F75 would only detect this exact same coin to 12.1". How/Wh
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Jim,
Next time this happens..... AFTER you remove the deep pull-tab, , , place the F75 in 'JE' mode, Sens '99', Disc '0' and '4' tone mode option. THEN SEE if the detector reports any iron over the excavated pile of dirt and subsequent hole. This should START to give clues .. if there are any tiny iron flecks in the concerned soil.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
This, by far, has been the most difficult.......yet....... the most rewarding type of hunting I have ever performed in all of my detecting career. Combing carpets of square nails,,,,going behind hundreds of other detectorists..... pushing the F75 to max capabilities - deep into the 'fatigue' zone....... and recovering any/every non-ferrous peep.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Sounds like extreme difficulty finding an area to CORRECTLY get a accurate GB. This is very important..... especially in his 'extreme trash' hunting conditions. Good sounding falses are a resultant for GB being incorrect. A site with burned down buildings is a nightmare!...as he so states. Burned iron will cause this problem also...... and with most any detector.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
John,
The lower the freq, the more resonant to silver (and deeper detection). This is to say, the higher the freq -- the more resonant to gold. This is for most cases. In a high mineralization environment.... higher freq's are more accurate,,,,, but penetration becomes difficult. ID accuracy will also suffer. Too many factors enter .... making a concrete answer very difficult. Unless y
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
In the following order:
1. F75 - Hands down.
2. F70 w/DD coil
3. Omega w/DD coil
4. F5 w/DD coil
---White's Vision might go here
5. T2
6. Gold Bug-II
7. White's MXT
Now........ If you are in bad mineralization, use the Minelab Explorer.
Tom
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Large steel (rusty or otherwise) ..... like a tin/steel can lid...will cause this. Be careful though; as a co-locate non-ferrous metal and a iron-masking culprit can also cause this.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Yes, and the results are interdispersed throughout this forum....... with a fairly large portion in "COMPILATION #1" and in "COMPILATION #2".
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
I wish to be optimistic...... yet, I can not imagine it having as tight as the EM footprint ..... or the microprocessor recovery speed as the F75. Maybe it will not have the target separation as the F75...... but maybe it'll have greater depth...... or some form (even just one) of a 'nitch' over all other detectors. That is all it takes. Let's keep our fingers crossed.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
In close proximity to iron (usually decomposed)... this is somewhat common. I encounter this problem in the 8" - 11" range in Florida..... but once again, the tab must be close to decomposed iron to encounter this 'up-averaging'.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
I have no idea how long this will last. Normally........ I dream of finding early (teen's) Mercury dimes. This site (although turned soil) is providing incredible.... lifetime-unforgettable finds. These 1840's & 1850's targets would normally be a couple of feet deep.... under normal Florida conditions. Feels like I'm hunting in the (more modern) New England States. Let
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum
Good capture.
--- With those conditions, I would move to a different area. Grass is too green, roots are too thick, soil is too organic; hence, targets will sink too quick. Old silver, wheats & indians are too deep in your conditions.
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NASA-Tom
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Thomas Dankowski Metal Detecting Forum