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LETS GET A TEST DONE ON?

Unless it's microprocessor controlled and operating on something other than decay curve to separate ferrous from non-ferrous, I wouldn't be betting the farm on it just yet. Some of the best PI engineers in the business have been working on discriminating PI for many years with very limited results compared to VLF discrimination and ID. But we can always be hopeful.

Ralph
 
the Pulse Devil can only use the DD coils to disc. Essentially, when the transmit phase is taking place the receive coil is being used like on a conventional VLF and, supposedly, is acquiring the same information that a VLF would about the target. The whole kit & caboodle then switches off as with a conventional PI, waits, and the receive circuitry turns back on. It's actually a pretty slick way of doing things and enables the detector to use 2 data sources. I've also read that it has the capability to engage in non-motion discrimination/ID. Think about how good it would be in dense trash. ...Willy.
 
...it still sounds as if the "VLF phase" would negate it's ability to ID at "PI depth". You still essentially have a "noisy" environment at one point (VLF-CW), and a quieter PI environment at another (true pulse), effectively giving you VLF and PI in the same unit, but where would the advantage come in on either side ? Wouldn't you still have pretty much the same thing if you were using separate VLF and PI units ? It seems like the VLF would only add as much as VLF would be capable of in the way of discrimination or ID up to VLF limits, and beyond that, you are still stuck with non- or limited discrimination PI. I'm just not sure I follow the supposed advantage of combining the two.

Ralph
 
Hi Matt,

Well, to quote your quote of me "PI units do have poor discrimination". So I do have something radically different in mind in the form of discrimination more in line with what we'd expect from a Minelab Explorer or White's DFX. While my GP does discriminate it is very unreliable compared to any decent VLF detector.

I have at least one horror story where relying too much on GP discrimination cost me a find of great value, but that is a story for another day. Using discrimination on the GP is a risky propostion at best. But for some applications it is still better than nothing. I certainly plan to explore more applications with it this summer.

Is anyone using the SD/GP machines in the UK for detecting?

Steve Herschbach
 
Well, right now PI's don't really discriminate/ID at ANY depth. At best it's iffy. As to how the detector works (nuts 'n bolts wise), you'd be much better off getting hold of David Emery (either on the PI forum or PM) and get the straight scoop. I could sit here speculating and pumping out copious amounts of possibly fine sounding BS, but it would be pointless. According to what I've read, it's a 3 tone detector with full range disc. and (I just checked up on it) a concentric coplanar coil (I thought it was DD.. my bad), and capable of non-motion disc. ...Willy.
 
.....get the discrimination on the 3500 to a reasonably accurate ferrous/non-ferrous level "at depth", it seems like it would make one heck of an inland relic detector. Slap on one of those monster NuggetFinder coils, and it would be showtime ! ;)

Ralph
 
I agree what you say about vlf's been surface skimmers, i bought an explorer after reading all the hype about its legendary depth and to be honest it is a real good machine especially excellent at finding small silver coins BUT it really is only a bit deeper than all the other top level machines out there. The discriminating pulse induction (if such a thing is possible) would be the dream machine of the future for sure. 99% OF COINS are within the top 12 inches but those small coins that are at say 10 - 12 inches are the hardest if not impossible to get with a vlf. All my sites are now worked out with vlf's . I would love a discriminating pulse induction detector it would find coins 5-6 inches deeper than a vlf. :jump:
 
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