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Date Posted: 11:19:47 08/28/02 Wed
Author: Steve Herschbach
Subject: Re: PI's and small gold - Questions
In reply to: Reg 's message, "Re: PI's and small gold nuggets" on 10:15:52 08/28/02 Wed

Hi Reg,

Wow, lots of good stuff in your post. Thanks!!

One big question I have about SD/GP versus Infinium relates to what we are talking about here. The Minelabs have two "channels", one for most gold, and another for some other "hard to detect" gold. The two channels are independently ground balanced on the SD2100. One the later models it's automatic, but you can use one, the other, or both channels.

Since they are independently ground balanced I do believe there really is something interesting here. Is it possible to set a PI up as two detectors in one? Dual sampling rates? I'm floundering a bit here, but I hope you get my drift. Basically, it seems the Minelabs may be better set up to get both large, deep gold, and small shallow gold.

Nobody knows how the Infinium is operating. Maybe they are doing something similar. No way to tell until someone somebody over at the Geotechnology page or PI forum digs in and does some tests. They could be running two "channels" but simply left the switches off for simplicity. There is almost no reason to ever run one channel on the Minelabs.

So there is one area of questions. Another I have is what about adjustable sampling delay rates? Why not a simple knob where I can shorten the sample delay rate for small gold?

As I understand it, the reverse discrimination control reaaly just lengthens the sample delay rate, so it seems this control just need more range. But maybe this a coil issue, and it's easier to lower sensitivity than increase it?

If there really is such a thing as "dual sampling rates" in the Minelabs, perhpas such a system does not allow for a reverse disc knob. Maybe such a knob is more possible on a "single channel" machine. So I'm guessing the reverse disc knob implies the Infinium is a "single channel" unit. One sample delay rate, which may be increased with the Disc knob. Or, maybe not! Questions, questions, questions!!

You are right on about volume/target strength. One reason the XT18000 is not perceived to be as sensitive on small gold as, for instance, a Gold Bug 2, is that the XT18000 has such a soft audio response. It detects the target, but you have to strain to hear it; the GB2 goes BEEP! I've noted when running the two side by side novices instantly like the machine with the loudest response. I can't figure why Minelab puts so little punch into the audio on many models.

So your idea about a signal enhancer on the Infinium really has my interest. The immediate problem is the special headphone connector. I've been planning on cutting the Garrett headphones off and wiring a 1/4" female plug on in thier place, so I can use different headphones. That would also give me the ability to try signal enhancers. I'm sure nobody has yet, because of the connector issue.

An aside... if anybody will make a "underwater connector to 1/4" female plug" adapter for the Garrett it will sell. I've suggested it to everyone, including Garrett, since day one.

Finally, the rumored "two Infinium versions". Garrett does not like the question! It is very bad marketing to release two versions of the same machine. Too many questions arise in the consumers mind about - "Which is best".

I think some of the rumor has it's basis in the fact that the Aussie version is being released with both underwater and dry land headphones. In the US, it's dry land only. So the Aussie version is "different".

But electronically? I heard early stuff about ground noise in Australia, and that Garrett was making adjustments. Probably just increase the ground balancing rates, but I'm not sure, as the Infinium already has a "fast" and "slow" GB tracking anyway. This led to some statements that the Aussie version might be different to handle the harsher ground conditions.

I have my doubts about there being any difference in production units. For the simple fact that it's just easier to crank out one version. I'll try and find out for sure. If they are all the same, I'm sure Garrett will confirm it. But if they are different, they may wish to avoid the question!

Steve Herschbach

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