Connecting wire from head to coil (inductance) and type of connection wire used to coil?

[Jasper1911]

Anyone have any idea as to what kind of wire is used to make the connection that's wound around the poles to the coil?

Also, wouldn't this winding create some sort of an inductance into the machine, whether needed or not?

I have an older ancient BH that I'm thinking of changing out the connecting wire to the coil to a good shielded coaxial cable and also running the wire straight down the shaft (maybe with some small torroids), instead of in the coiling/wrap style on the shaft. Maybe there's some inductance required for the machine head from the coil for it to work properly. I'm not sure. I know inductance and capacitance can be a freaky thing at times.
Anyone have any thoughts on this?...Just curious if any mods have ever been tried to see if better results are gotten or if the performance is made worse.

[HarveyH48]

Just guessing, but I'd suspect that there are 4 wires leading down to the coil, which is probably two coils, one to transmit, and one to receive.

The head is tuned/calibrated to operate in a certain range, probably something best left to those more familiar with RF circuits (not me). I don't have enough experience in that area of electronics, not sure if my equipment is up to the task either. Not something I mess with, just for fun. If the cable was damaged, and not really worth getting a new coil assembly, making the machine basically junk, might fool around with it, nothing to loose.

I've read that the cable needs to be secured, so it's not hanging loose, where it can move around, causes false signals.

[HarveyH48]

Double post...

[ambivolent]

I have a coil cable off of a 5 pin BH machine there are 5 wires inside my photobucket wont let me log in at the moment but I'll post a pic of it ASAP

[Jasper1911]

Just wondering if a shielded coaxial run straight instead of in a helical fashion might change things. At least something along the lines of RG-8 or better and maybe switch out the poles for some solid, clear synthetic material that'd stand up the abuse.

Hell, I'm showing 19 VAC in my house receptables just due to the lines being so close together in the attic. Wonder what it's show on the wires wrapped around the pole of a BH or any other machine for that matter.

[ambivolent]

Here is what it looks like I got this from a broken coil, I was going to make a pinpointer out of it before my BH quit working.

[Jasper1911]

Good...at least it's a shielded wire set. What made me think of this is tehe intereference I get around power lines with that old BH. Just curious if they had shield wire, but I'm still curious about the inductive part with the wire being on a metal shaft like that. It may be moot, but it's made me curious....A Tesla Coil has a primary and secondary coil...wonder if you could just modify your MD to shoot lightning bolts out at the spot where the target is?....lol


Thank you for the pic

[John in NC]

The inductance and resistance are important, the capacitance not so much. You can safely change the wire to a shielded coax and run it inside the tube with no problem. You will have 2 wires for the transmit coil and 2 wires for the receive coil. The fifth wire is likely not used. It probably won't buy you a lot because the receive coil is just a big antenna. Some companies use shielding paints with carbon, or a shielding wire wrapped around the coil and connected to one side of the receive coil.

[Rudy]

The fifth wire should be connected to ground on the motherboard and to the coil shield on the loop. It forms an electrostatic shield designed to quiet the detector by reducing capacitively coupled interference. It has no effect on the detection of a magnetic field from the target.

[donnyjaguar]

If its like the ACE, Tesoro and probably many others, the type of wire doesn't matter that much because the receiver portion of the circuit is only "listening" during a rather quiet portion of the transmit signal. There's actually two circuits with one phase-retarded slightly (iron) and the other more advanced (silver). The shielded cable may actually increase capacitance on the receive portion and make detection of weak signals more difficult.

Of course I could be wrong.

[Jerry-Wi]

It could be an expensive way of experimenting if you do not know for sure what you are doing. Even if you succeed it would be a lot of work for little or no gain in performance.

Jerry