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Results 241 - 270 of 1917
Thank you for your generous offer, sir, but after some thought, I've decided to decline.
I'm not one for making 'New Years Resolutions' , as I typically fail... but I do want to have my finances under control next year, and buying another detector isn't going to help that.
Mr. Sven's right about the shipping, it could be up to 6 weeks by bamboo raft, or whatever
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Pimento
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Thomas Dankowski Metal Detecting Forum
I was reasonably interested myself, but international carriage charges, combined with the hit/miss of UK Customs officials, who could slap +30% on the declared value, make it not worth the risk.
I get the impression that secondhand Impact prices are not strong, as the availability of the Kruzer and Anfibio makes them seem like 'last years model'.
In fact there's a similar Impact
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Pimento
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Thomas Dankowski Metal Detecting Forum
And we overlooked the Fisher F11, F22, F44 which all run off 2 x AA cells, so 3 Volts nominal.
And this Quest (Deteknix) Q40 teardown shows that the internal Li power is a single 3.7V 2300mAh cell ... though it may be two cells in parallel, it looks a bit 'lumpy'. Presumably the lower model, the Q20 will be similar internally.
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Pimento
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Thomas Dankowski Metal Detecting Forum
Quote:" I would say pick it up and update it"
I imagine that's one question that potential purchasers may wonder about. Is it updatable ? Will the 'pre-production' hardware be compatible with any current or future software downloads?
I'm just thinking here about the F75 upgrade chaos , caused by new software not working on older circuit-boards, and Fisher having t
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Pimento
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Thomas Dankowski Metal Detecting Forum
Electronic circuits, specifically "Switched-Mode voltage converters" can change just about any voltage into any other voltage. Larger voltage. Smaller voltage. Negative voltage. Any combination of the above. If you want +5 Volts AND -5 Volts from a single 1.2 Volt NiMH cell, it's perfectly achievable.
And a great many modern machines use such converters, even lower end ones, like
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Pimento
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Thomas Dankowski Metal Detecting Forum
The wonders of electro-chemistry mean that charging a 5000mAh cell at 500mA will take about 14 hours. Charge current tends to drop off over the last few hours, it's typically a constant current flow until the cell voltage reaches 3.7 V, then that voltage is maintained while the remaining juice goes in, during which time it naturally takes a reduced current flow.
New cells do take a couple o
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Pimento
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Thomas Dankowski Metal Detecting Forum
Does it actually fit in that rucksack/backpack when fully disassembled ?
Is that a wing-nut on the coil-fixing bolt ? I feel that's a potential source of trouble - guaranteed someone will over-tighten that at some point.
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Pimento
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Thomas Dankowski Metal Detecting Forum
Quote:"a contactless charging system to prevent a short circuit if the toothbrush is wet"
It's not to prevent electrical mishaps/'short circuits', all you need is something as simple as a 2 cent diode in series with one of the charging contacts to stop any current flowing 'out' of the toothbrush. ( actually: out of one terminal, back into the other)
This is no
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Pimento
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Thomas Dankowski Metal Detecting Forum
Dimitar should consider a contactless charging system on the 'next model' . The type of system used on some cordless battery toothbrushes, and also some submersible pinpointers.
I have a couple of Philips Sonicare toothbrushes in bits at the moment. For charging, they have a wire coil wrapped around a short ferrite rod in the base of the handle, presumably the matching charger has simi
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Pimento
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Thomas Dankowski Metal Detecting Forum
Higher coil voltage/power is also nowhere near as detrimental to run-time as most people assume. The "most of the power goes into the coil" thought process is so very wrong.
Take a frugal machine like a Fisher F75, for example. Total power drain is about 50 milliAmps at 6 Volts, so 300 milliWatts. The power put into the search-coil is under 20 milliWatts . If you doubled the coil volt
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Pimento
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Thomas Dankowski Metal Detecting Forum
No-one has mentioned the (older) Nexus machines. Those who have used them report they are good in poor EMI environments. And as an engineer and Geotech1 regular, I have seen why. Quite simply, Georgi has designed the machines so they transmit a strong signal. Usually with a combination of higher voltages applied to the coil, and use of a tapped transmit-coil winding, so it functions like a simple
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Pimento
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Thomas Dankowski Metal Detecting Forum
I would like to advise Mr. Dankowski to be VERY wary when looking for 'high performance' 26650 size Li cells. There's no shortage of fraudulent manufacturers/sellers of Li cells claiming nothing more than entirely made-up specifications. They're not just exaggerating, or claiming the 'best possible' figures at the ideal ambient temperature/discharge current/moon phas
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Pimento
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Thomas Dankowski Metal Detecting Forum
One thing I wasn't sure about, re: coil swapping - are all the 11 x 9 coils exchangable/identical, or is it the change to a smaller or larger coil that's the technical hitch? If it's a case of every coil being unique and needing some 'calibration' , then there probably is some greater-than-normal complexity to the coil. If it's troublesome changing to a smaller/large
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Pimento
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Thomas Dankowski Metal Detecting Forum
Yes, that's what I'm talking about.
Hence all my speculation about the use of Hall Effect magnetic sensors in the coil, which would increase the likelyhood of no two coils being identical, and the machine needing to be calibrated to the individual coil's 'quirks'.
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Pimento
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Thomas Dankowski Metal Detecting Forum
Thanks for that, Tom. Maybe those Chinese MD-xxxx machines are multi-domain, too, hence why they have such great depth...
For the non-engineers out there, the "domains" in question will ( in my opinion ) be the "frequency domain" and the "time domain" , together. FD is regular VLF operation, TD is pulse-like. It's been suggested elsewhere it was likely to be
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Pimento
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Thomas Dankowski Metal Detecting Forum
I di wonder about that MDT prefix myself. Is it Metal Detector Tarsacci, or something more complex, eg. the D is for Dimitar. You're right, though, if it was the MD-8000, I would expect the name to be already in use for a Chinese machine that finds objects 7 metres deep, yet only costs 45 Dollars.
Here in the U.K, Equinox IS pronounced "eck-wee-noks". Dunno why. Equal is pronoun
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Pimento
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Thomas Dankowski Metal Detecting Forum
Bearing in mind how many detectorists can't spell 'Deus' correctly, it may have been unwise for the inventor to choose the name he did .... I can forsee Tarzachi, Tawasaki, etc appearing in the coming weeks.
But he could've called it the Gargovatronic GGT8000, if he wanted a retro 1970's feel to it. !
I did notice that a Google search ( months ago) for the name produc
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Pimento
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Thomas Dankowski Metal Detecting Forum
You mean the small coils, with the battery located in the lower shaft? There's certainly room in the shaft for a bigger battery.
I also wonder if PI's are less tolerant of stuff near them, like a battery and electronics board. So perhaps the in-shaft location is the best place for that reason too.
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Pimento
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Thomas Dankowski Metal Detecting Forum
PI's are usually, though not always, power-hungry machines, which makes the concept of having a battery inside the coil a problem.
Plus, it would have to be a top-end performer, there's no point manufacturing a basic 'Surfmaster' with cordless technology at a high price.
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Pimento
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Thomas Dankowski Metal Detecting Forum
My thoughts were that it would more productive time-wise to dig 100 new targets that gave a reasonable indication that they were 'good' ( non-iron, to me) rather than struggle to dig 100 probably-deep-ish targets that are completely unknown and 75% likely to be iron rubbish.
I have some practical insight into this, detecting land that was last cultivated 350-400 years ago. My F75 is
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Pimento
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Thomas Dankowski Metal Detecting Forum
Then there's the complexity of the coil.
If you choose a DD, you're going to have to use the TX and RX coils for both PI and VLF, I think. So your PI is not going to be getting the same depth as a round mono coil the same size. I'm unfamiliar with DD's on PI machines, so I don't know if the gain can be made up in some way. Your alternative, using the TX coil as the recei
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Pimento
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Thomas Dankowski Metal Detecting Forum
Quote:"If you guys can come up with a reason for not wanting a detector with the functionality described above ... you've got me beat."
I never understood this "if it's deep it's gotta be dug" concept. It seems to imply that a small range of targets that are in a specific range of detectability are "desirable", when that is not the case. They're
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Pimento
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Thomas Dankowski Metal Detecting Forum
The subject of what makes ground "HOT" is quite complicated, and I understand it also matters whether you're referring to PI or VLF machines, as they 'see' different things.
I think a seperate thread devoted to this is called for.
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Pimento
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Thomas Dankowski Metal Detecting Forum
What are you planning on doing with the 5 gallon bucket? Sitting it on the ground? Digging a bucket-shaped hole and burying it? Both of those are unrealistic and not worth trying.
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Pimento
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Thomas Dankowski Metal Detecting Forum
I would like to offer my thoughts re: 'imported dirt'.
The signal that the ground gives is largely caused by the dirt nearest the detector coil, and the deeper dirt has less influence - just as a shallow target gives a stronger signal than a deeper one. So your 'imported dirt' needs only to be 8 inches deep, even if you're planning on burying targets 12 inches deep.
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Pimento
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Thomas Dankowski Metal Detecting Forum
Harold: You're not thinking globally. A significant number of US-made machines are exported, whether it's Europe for relic-hunting, Australia for nuggets and general coin/jewellery hunting, Africa for gold. There's plenty of cutomers out there that don't have 'hunted-out' land.
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Pimento
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Thomas Dankowski Metal Detecting Forum
I agree, and their website even has a page specially for reporting lost and found class rings:
But it seems all those folks telling him "he's paid for his detector" would do otherwise ....
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Pimento
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Thomas Dankowski Metal Detecting Forum