Minelab Manticore's Conductive Shaft problem with ground balance

[@phrunt]

This is a must watch video on the problem from a First Texas (Fisher metal detectors) engineer, Carl Moreland demonstrating why I care so much about this problem. Https://kzbin.info/www/bejne/oF6QlniBbLeGmpY And a follow up video he's also done explaining the problem kzbin.info/www/bejne/fqq0qYeImruVhrcsi=nDXFuaKt17Lf0iQB

[@idigdaytona4478]

The Manticore is a motion detector . If you set it on a coin and don't move the coil it will not ring until you move the coil or the coin , unless you are in pin point mode as it is a no motion mode. . When the shaft moves with the coil the coil does not detect it . My Manticore runs quiet and detects very tiny targets at surprising depths . Carbon fiber is conductive . The core of some spark plug wires are made of carbon.

[@phrunt]

You're right, but the shaft will sometimes move not in conjunction with the coil like if you bump a rock, or if you're using the shaft pivot to go in and under rocks and bushes, and when you do this particularly in gold modes, it falses badly which can make you miss targets. It's a good idea to watch this video from Carl and First Texas (Fisher metal detectors) as he did a good video explaining the problem. kzbin.info/www/bejne/oF6QlniBbLeGmpY

[@diggerdaz279]

Now there’s a proper answer from somewhere that understands detectors 👍

[@ROJMETALDETECTOR]

Shaft and cable attached to coil,you move them together,no negative effects on machine. See Deus extrem Hunter It has been made of Aluminum totally

[@phrunt]

Gold prospectors tend to pivot their coil a lot on the shaft to follow the ground and detect in and around rocks, we can't superglue our shaft to the coil to prevent movement, we want it to move, and move a lot.

[@mossig]

Now I have to check my old Minelab explorer who is always falsing a lot, if it is because the coil is pivoting on the shaft when hitting straw etc.

[@phrunt]

It should be OK, my CTX 3030 came with a carbon shaft, and it doesn't cause it any grief, the detector is simply not sensitive enough to low conductor targets to care, this is mainly a problem for gold prospectors or jewellery hunters that rely on higher frequencies.

[@benrjohansen]

Is there metal in there?

[@phrunt]

No, cabon fibre shafts are conductive, just like coke often detected in UK which is carbon. Coal also behaves the same. it's just a conductive material.

[@1995H8]

What is it because the main problem is carbon fiber that conducts electricity or dish wires?

[@phrunt]

the coil cable is not a problem at all, very little impact from it, the problem is the carbon fibre shaft is so conductive, it may as well be made of aluminium as that's how bad it is.

[@1995H8]

@@phrunt This is a malicious and deliberate act by a company that knows what is wrong and then keeps silent about it. If you fix the problem of acne, will you solve the problem of hypersensitivity to the highest levels?

[@phrunt]

@@1995H8 I simply think they were unaware of the problem perhaps blaming it on the coil cable being detected, the after-market manufacturers had been making full carbon shafts for some time, the most likely people affected are prospectors, others may not even notice even if it is detrimental to their detector's performance.

[@1995H8]

@@phrunt Those who have tried the device and are the first among them know the problem and tell you that you should distinguish 1-2

[@1995H8]

This problem has an impact on the sensitivity of the device and does not raise it to the maximum level

[@JoeDirt-sf8fu]

First of all, waving it around is not how the shaft works - connect it to the coil, no problem. Remember metal shafts?........there was no problem there either when CONNECTED.

[@phrunt]

Never looked for gold have you? You take advantage of this thing called a coil nut and bolt, and the rubber washers, they're there so you can move your coil in relation to your shaft so you can poke it into places and bend it around to get under bushes and so on, doing so causes the shaft to react giving you false signals. So yes, connect it to the coil and there is a big problem, you just don't understand it. kzbin.info/www/bejne/g2TNfKawmtqeb5Ysi=LqcC5v-zrvFtj-nu

[@JoeDirt-sf8fu]

@@phrunt Yes, I have looked for, and found, gold with a PI machine. Tiny nuggets and even dozer blade shavings.

[@phrunt]

@@JoeDirt-sf8fu I'm completely puzzled why you would think a metal shaft, or a conductive shaft like the Manticore has is ok, the slightlest movement from the shaft in relation to the coil sets the detector off with a false signal. At first it was a common misconception it was from it detecting the coil cable, however, the detection of the cable is so minor compared to the shaft, the cable needs to near touch the coil to cause a false, the shaft on the other hand can be held almost a foot above the detector and be detected. Every time you move the shaft on it's pivot in relation to the coil you get a false signal. Too bad if you keep getting them and get so used to it you miss a real target dismissing it as just another false from the shaft.

[@phrunt]

Here is a video from an engineer at First Texas (Fisher) explaining the problem. kzbin.info/www/bejne/oF6QlniBbLeGmpY

[@JoeDirt-sf8fu]

@@phrunt I'm not too smart, that's why.