Whites Dual Pulse

[SWMO Mark]

Is the coil on the Whites Dual Field PI a non-bouyant coil? Is the 12" coil hard to handle in rough surf conditions?

 

[grumpyolman]

I use mine in fresh water so don't know about the surf. The damn thing does float. Go figure? A water machine with a floating coil?
My solution in fresh water (You'd need more in saltwater). I got nice clean white sand...non-mineralized. I poured as much in the hollow lower rod where the rod connects to the coil. I then got, you'll have to experiment, 18" of 3/4" clear plastic tubing like you'd see on a fish tank. I got a double male barbed PVC connector and plugged one end. I poured sand into it until almost full and then bent it making a circle and plugged the open end with the other end of the double male fitting. I then wire tied it to the coil and went for a dip. I could use a little more sand as if I let go the coil would slowly lift off and head for the surface. I can use larger diameter tubing or make it longer. That coil is really buoyant. Anybody know why White's did that? Jim

 

[Wet and Dry]

I can only say from my point a view. It might have to do with dropping it in the water.Makes it easier to find. But the housing floats too. Got it on a belt on it floats, so I think it's a design thing. They could fill it with resin when they assemble it. Have a bleed off hole. Could we not drill a small hole and fill it our self.

 

[grumpyolman]

Man! Too many wires and stuff running around inside that coil to risk ruining it. That's sort of voodoo in side those coils and the resin just might prevent or decrease the quality of the signals going in and out. The sand in the plastic tube works good enough. They obviously didn't think about people using at as a diving machine. Find a target on the bottom and let go to fan for the target and the coil takes off towards the surface. The only thing that stops it is a yank on the wires, somewhere, and sooner or later that's going to cause a failure. Read somewhere that the wire for a PI is shielded wire and that shielding can separate and break with a lot of flexing. Same kind of wire they use for HAM radio transmitters as it keeps the signal inside the wire and doesn't let it radiate. More bang for the buck and less susceptible to EMI with the shielded wire. Jim

 

[bdahunter]

I have an Excal 1000, a CZ-21 with the 10" coil and of course the Whites Dually; of the 3 machines the Dually is the hardest to handle in the surf. I have reversed the coil so it is a goofy foot set up and that helps to make the Dually less of a handful in heavy surf. The floatation is a bit of a problem as well and the gaskets are not strong enough to keep the coil from pivotting up in a heavy surf, I find myself pushing the coil flat every so often with my foot but some people have installed platic braces. Nice deep seeking PI unit but I think Whites let this machine out of the skunkworks without think through the other aspect of a detector that make it useable in the water.

Cheers,

BDA

 

[cjc]

The Dual Field is about the deepest submergable pulse on the market right now, and what I particularly like about it is that with the Gain control, you have a lot more juice than you can use--a great learning tool. I'm a firm believer in the idea that to find out what a detector will do, first find out what it won't --then back up a bit. It's also surprised me with the tiny targets that it responds to. That said, the coil is the center of what makes it a great detector, but like everthing in the build game, there are tradeoffs. With the DF, the space required for the amount of coiling would be cumbersome if it were weighted (or filled) to sink (I've tried it). It does take some getting used to for jumps down to the bottom in neck-deep water but I've gotten used to it. Going deeper would probably require a belt clip of some type but for sure be do-able. The config of the coil does have a bit of pull in rough surf but I shorten the stem to have more control. These would be conditions in which it would be hard to work with anything. The depth of this machine is well worth adapting for IMO.
cjc

 

[diver4hire]

i have been using mine for 3 months now and i don't find the floating coil is an issue at all , and even if it was this detector goes deep so it would be a fair trade off
i do at times get frustrated digging deep just to find a penny or pull tab