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adamBomb Wrote:
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> I guess my questions are, is the Jr as powerful as the IV? Is the IV too big for a
> 9 yr old or is the JR too small for a 9 yr old?
The original Jr is a TR machine, the new one is a VLF. For a 9yr old, I think they are too small and too toy-ish. I would recommend them for a 6 yr old. The Tracker would be a bett
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Geotech
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Thomas Dankowski Metal Detecting Forum
Is an 1878 Morgan dollar in MS-70 condition brand new? If it hasn't been used, is in original mint condition, and preferably in it's original packaging, then it's considered "brand new". I have a 1970's Bounty Hunter Outlaw (the old TR/BFO model) that is in it's original packaging, never even been put together much less used... it is brand new.
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Geotech
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Thomas Dankowski Metal Detecting Forum
A book, a miniseries, and a blockbuster film about the hunt & recovery are all worth far more than the treasure itself. If not any of those, then I expect the Andy Warhol 15 minutes would be overwhelmingly tempting. Pay yer taxes and bask in the limelight.
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Geotech
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Thomas Dankowski Metal Detecting Forum
Tom_in_CA Wrote:
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> Or the finder can elect not to sell at all (which is a liberty the UK hunters don't have the ability
> to choose).
The UK law pertains to hoards or finds of significant cultural value. Stuff that really belongs in a museum. Not everything. It's a pretty good model, IMO.
> So if someone is "
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Geotech
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Thomas Dankowski Metal Detecting Forum
The UK has a pretty good system. If you find a treasure hoard, the government has first rights to buy it from you at fair market value. If they decline, it's yours. Since these guys would have been paid for turning in the treasure, it sounds like they were simply evading taxes. And also cheating the landowner, with whom they likely had a deal. I have no sympathy for that.
I like the UK la
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Geotech
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Thomas Dankowski Metal Detecting Forum
silverfiend Wrote:
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> The only problem here is that you have to be a mem
> ber to see anything on that forum, and nobody has
> ever replied to my request to join from last year.
I recently changed the registration, if you have trouble email me.
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Geotech
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Thomas Dankowski Metal Detecting Forum
Original here, complete with paragraph breaks:
https://www.nexusdetectors.com/articlespg2.html
Mr. Wren sounds like an experienced detectorist with a fairly shallow understanding of the technology. Apparently he is unaware of wideband circuit designs, where coils are not tuned at all.
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Geotech
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Thomas Dankowski Metal Detecting Forum
Pimento Wrote:
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> This sounds like a typical Geotech1 thread:
> "i am wanting finding golden treasures 10 metres deep. what depest detector i am needing please"
I spewed my coffee, thank you.
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Geotech
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Thomas Dankowski Metal Detecting Forum
"Until the tree is cut down, there is no physical possibility of opening the entrance."
That tree looks like it could be pushed over. It certainly could have been cut down in the time it took them say the sentence above. I suspect a month from now, they'll still be talking about how the heck they're gonna get that tree out of the way.
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Geotech
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Thomas Dankowski Metal Detecting Forum
Yes, It's an LRL. These thing come & go on a regular basis. I don't even try to keep up with them.
Except for the eyeball, there is no such thing as a diamond detector.
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Geotech
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Thomas Dankowski Metal Detecting Forum
Mike is largely correct.
"IB" refers to the coil design, nothing else.
"VLF" strictly means the frequency range of 3kHz - 30kHz. However, it's common to extend the term beyond that, i.e. the White's Coinmaster V Supreme, Fisher Goldbug 2, and Minelab Eureka are all considered "VLF."
"TR" originally referred to the coil design as well, tho
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Geotech
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Thomas Dankowski Metal Detecting Forum
Des, I own about every beach PI ever made. The SS is no barn-burner; compared to the SMPI, Beachscan, SeaHunter, and HHPI it is the least sensitive of the lot. The primary reason is the sample delay is 22us, most everything else is 15us. But that also makes it incredibly stable in & out of salt water, other units often exhibit a breathing effect. Another negative is the spiral PCB coil design
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Geotech
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Thomas Dankowski Metal Detecting Forum
steveg Wrote:
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> NASA-Tom,
>
> Could there not theoretically be an analogous way that could be conceived, where we transmit EM
> radiation into the ground, and -- sort of analogous to receiving/measuring/deciphering a tiny, minute
> phase shift in the EM wave imparted by a object in motion -- measure something akin to
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Geotech
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Thomas Dankowski Metal Detecting Forum
EPL II Wrote:
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> On my Equinox, I can AUTO noise cancel and get a different number each and every time I use the function
> (I can push the button 5 times and get five different numbers that the machine settles on) Is EMI / silent EMI
> causing it to change that much in a matter of minutes?
Probably means the EMI is close t
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Geotech
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Thomas Dankowski Metal Detecting Forum
Noise cancel doesn't actually cancel noise. It very slightly adjusts the operating frequency (by maybe 1%) so that the noise falls outside the post-demodulator bandwidth. It's still there, in the RX coil, in the preamp, and in the demod circuit. It's very possible that in the demod the noise is modulating the target signal and spreading the energy out, effectively reducing the sign
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Geotech
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Thomas Dankowski Metal Detecting Forum
youdig Wrote:
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> do you have the patent number ? thank you.
Try 3020471 and 4157579. Probably others, do a search on Anthony Barringer.
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Geotech
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Thomas Dankowski Metal Detecting Forum
youdig Wrote:
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> maybe this could help you understand =)
>
>
I like a lot of the work Carl Nelson has done at John Hopkins, but this patent isn't one of them. It's a very clunky approach to a hybrid system.
In the 1960's Tony Barringer pioneered (AFAIK) half-sine systems. This is the most sensible way to ap
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Geotech
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Thomas Dankowski Metal Detecting Forum
rustic charm Wrote:
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> These are simply my beliefs Rick from my experiences and what I have seen in the industry...
The problem, Rustic, is they are beliefs and based on no first-hand experience. I worked for White's for 6 years, now work for FTP, and have toured both the Garrett and Tesoro factories. I believe I have personally
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Geotech
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Thomas Dankowski Metal Detecting Forum
Bill long Wrote:
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> That video describes exactly what I was trying to get across with my post. Just a simple thought. Put
> ALUMINUM in the same tone class with iron. Low tone= ferrous target and also equals aluminum.
> Everything else high tone. Forget the numbers ID for now, maybe that could come later.
For most detectors,
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Geotech
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Thomas Dankowski Metal Detecting Forum
Bill Mahan started "Bill Mahan's Treasure World" magazine in the mid 60's.
It became "Treasure World" and "True Treasure" on alternating months.
Then combined into "Long John Latham's Lost Treasure".
Then eventually Lost Treasure.
At the same time, Western Treasure evolved into Western & Eastern Treasure.
And "Treasure," &q
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Geotech
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Thomas Dankowski Metal Detecting Forum
NASA-Tom Wrote:
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> Has anyone ever looked up IP-68 spec's? It's kind of interesting. 1.5 Meters deep ….for 30-Minutes.
> That's all!
IP68 isn't a hard spec, it just means "submersible waterproof" and the manufacturer defines "to what."
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Geotech
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Thomas Dankowski Metal Detecting Forum
Sequential -- transmit a low f, then transmit a high f, then back to low, etc. BBS/FBS from Sovereign to CTX do it the same way.
Concurrent -- mix the 2 (or 3) f's and transmit them together, continuously.
Selectable -- only 1 at a time, with very specific and widely separated frequencies, most likely by switching in select caps to the coil.
Variable -- only 1 at a time, but any frequency
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Geotech
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Thomas Dankowski Metal Detecting Forum
BBS/FBS are sequential MF, not simultaneous.
Sequential MF: BBS, FBS
Concurrent MF: CZ, DFX, V3, Equinox
Selectable freq: Eureka, XTerra, Deus, Impact
Variable freq: Alter71
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Geotech
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Thomas Dankowski Metal Detecting Forum
ncwayne Wrote:
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> I think we need a definition of "co-located." Is it a function of distance, specific metals, or machine response?
A strict definition would be 2 targets on top of each other. But a nail is longer than a coin so in one direction its dipole response(s) aren't coincident with the coin. With a big enough n
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Geotech
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Thomas Dankowski Metal Detecting Forum
Mickie Wrote:
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> Why don't you give us a demo Mr. instead of criticizing Keith.
Not criticizing Keith, at all. I have tremendous respect for him. Just trying to explain the mechanisms going on.
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Geotech
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Thomas Dankowski Metal Detecting Forum
The video shows 2 entirely different mechanisms that are often misunderstood. When a nail and a coin are co-located, "recovery speed" is meaningless. An induction-mode detector sees the 2 targets as a single target; the nail response cannot be separated from the coin response, no matter what the recovery speed is. The result is a composite signal that depends what the targets are, orien
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Geotech
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Thomas Dankowski Metal Detecting Forum
Daniel Tn Wrote:
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> Better late than never. I guess they decided to see if people were just blowing smoke when they would post on the forums saying things
> like "They should have put a TDI in a waterproof housing...if they did, they couldn't make them fast enough.".
I designed the TDI-SL board to fit either the m
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Geotech
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Thomas Dankowski Metal Detecting Forum